EP3365541A1 - Chambre de précombustion pour un moteur à combustion interne, moteur à combustion interne muni de ladite chambre de précombustion, et procédé de conception et/ou de fabrication de ladite chambre de précombustion - Google Patents

Chambre de précombustion pour un moteur à combustion interne, moteur à combustion interne muni de ladite chambre de précombustion, et procédé de conception et/ou de fabrication de ladite chambre de précombustion

Info

Publication number
EP3365541A1
EP3365541A1 EP16781286.6A EP16781286A EP3365541A1 EP 3365541 A1 EP3365541 A1 EP 3365541A1 EP 16781286 A EP16781286 A EP 16781286A EP 3365541 A1 EP3365541 A1 EP 3365541A1
Authority
EP
European Patent Office
Prior art keywords
prechamber
internal combustion
combustion engine
chamber
seen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16781286.6A
Other languages
German (de)
English (en)
Inventor
Frederic DUMSER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP3365541A1 publication Critical patent/EP3365541A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/08—Engines characterised by precombustion chambers the chamber being of air-swirl type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/02—Engines characterised by means for increasing operating efficiency
    • F02B43/04—Engines characterised by means for increasing operating efficiency for improving efficiency of combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2720/00—Engines with liquid fuel
    • F02B2720/27—Air compressing engines with hot-bulb ignition
    • F02B2720/272—Supply of all the fuel into the prechamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the invention relates to an antechamber for an internal combustion engine, to an internal combustion engine having such an antechamber, and to a method for designing and / or producing such an antechamber.
  • an ignition amplifier is used to control a burn rate, above a certain bore size of cylinders, which is typically more than 100 mm
  • preamplifier Priority position of the combustion and thus also to maintain an achieved engine efficiency at a desired level.
  • preamplifier are typically used prechambers, wherein in a separate from a main combustion chamber, but connected via so-called shot channels volume by means of an ignition means a mixture is ignited, wherein the ignition creates an overpressure in the antechamber relative to the main combustion chamber, so very hot reaction products and burn unburned mixture through the firing channels from the antechamber in the main combustion chamber and ignite the mixture arranged there.
  • the combustion rate in the main combustion chamber compared to the use of a simple spark with very small spark volume is usually significantly increased, resulting in the burning time in
  • Main combustion chamber shortened. Particularly in the case of particularly large cylinder bores, rinsed prechambers are used in which a mixture within the prechamber can be enriched with respect to the mixture in the main combustion chamber by a separate fuel supply to the prechamber.
  • Preferred direction can take place, wherein the flow field can tilt in any direction or angular position. Therefore, the cyclic variations in such an atrium are large.
  • the invention has for its object to provide a prechamber for an internal combustion engine, an internal combustion engine with such an antechamber and a method for designing and / or producing such a prechamber, said disadvantages do not occur.
  • the object is achieved by the objects of the independent claims are created, advantageous embodiments will become apparent from the dependent claims.
  • the object is achieved in particular by providing an antechamber for an internal combustion engine which has a surface which is flowed during operation of the prechamber and which is arranged in an interior of the prechamber. It is provided that the surface has at least a first surface area and at least a second surface area, wherein the first surface area has a specific structure, and wherein the second surface area is free of this structure.
  • the second surface area does not have the particular structure that the first surface area has.
  • the first surface area is due to the particular structure over the second
  • the pre-chamber proposed here has advantages over the prior art. In particular, a can
  • the structure forms local turbulences which increase the local turbulence kinetic energy, which in turn leads to a local pressure drop along the structured surface. Due to this local pressure drop, a force arises on the inflowing medium, which leads to an application of the flow to the structured surface.
  • the particular structure is in particular designed such that this force is greater than forces that result due to cyclically changing influencing variables, so that a cyclically insensitive flow pattern arises within the antechamber with respect to these influencing variables.
  • the specific structure preferably comprises a certain surface roughness and / or certain unevennesses and / or specific break edges. The flow field during the inflow of fresh mixture into the pre-chamber is thus defined and made insensitive to external influences.
  • Cyclic fluctuations of the flow pattern within the pre-chamber are thus significantly reduced, so that ultimately cyclic fluctuations in the ignition and thus in the combustion and in the emission behavior of the internal combustion engine are reduced.
  • Combustion stability in general is increased and it becomes otherwise unstable
  • the increased combustion stability can be used, in particular indirectly, to increase the efficiency and to reduce emissions - in particular of the hydrocarbon emissions - of the internal combustion engine.
  • Concentration distribution of gaseous species in the pre-chamber at the ignition point represent an ideal state, which can be approximated by the pre-chamber proposed here in an improved manner.
  • Under an antechamber is in particular a compartment of a main combustion chamber of the internal combustion engine divided compartment or volume understood, which via at least one bore, preferably a plurality of holes, which also as
  • the pre-chamber has a - in particular central - riser, via which in a compression stroke of
  • Internal combustion engine fresh mixture can be introduced into the interior of the antechamber.
  • the pre-chamber is formed as a rinsed pre-chamber, in which case it has a separate fuel supply.
  • the prechamber is in fluid communication with a fuel purging channel or has a fuel purging channel for supplying additional fuel into the prechamber.
  • Antechamber proves to be particularly favorable in large-volume displacements, because so compared to unreinforced antechambers increased ignition energy can be provided.
  • the antechamber is designed as an unsulled prechamber.
  • the prechamber no separate fuel supply, but the prechamber is an ignitable combustion air-fuel mixture exclusively on the with the
  • the prechamber is formed in a cylinder head of the internal combustion engine, and in particular, it may be integrally formed with the cylinder head.
  • the antechamber is part of a pre-chamber ignition device, in particular a pre-chamber spark plug, wherein in particular an ignition element of the ignition device is surrounded by a penetrated by at least one bore wall, whereby the pre-chamber is formed.
  • the pre-chamber is interchangeable in this case together with the ignition device.
  • an ignition device or an ignition element is arranged, which / can be set up, for example, for electrical spark ignition, for Laser ignition, for corona ignition or generally high-frequency ignition, or for ignition by means of pilot jet injection of an ignition material.
  • any embodiment of an ignition device for igniting the ignitable mixture in the prechamber can be used.
  • the fact that the surface has flowed during the operation of the prechamber means, in particular, that along the surface during operation - in particular in a compression stroke of an internal combustion engine having the prechamber - a gas flow flows along the surface or sweeps over the surface. In this case, this gas flow combustion air, fuel and / or a mixture of combustion air and fuel.
  • An interior of the pre-chamber here refers in particular to an inner volume enclosed by a pre-chamber wall, which in the assembled state is fluid-connected via at least one bore to a main combustion chamber.
  • the interior is in particular the part of the
  • Prechamber in which the ignition device or the ignition element is arranged.
  • the flowed surface is in particular facing the interior of the antechamber.
  • the structure is a particular structure means, in particular, that this does not happen by chance from a manufacturing process for the pre-chamber, but rather is deliberately introduced into the first surface area or provided on the first surface area. In particular, this is a procedure which goes beyond a possibly customary surface treatment for a pre-chamber wall and which is used to arrange the structure on the first surface area. In this case, in particular, both the first surface region is specifically selected, and the structure is arranged in a specific, predetermined manner on the first surface region.
  • first surface area has the specific structure means in particular that the first surface area is structured.
  • second is structured.
  • the flow-through surface is formed as the surface of an inner wall of the prechamber.
  • the surface is readily facing the interior of the pre-chamber and directly and directly able to influence the flow behavior in the prechamber.
  • the specific structure is formed integrally with the inner wall.
  • the specific structure is preferably introduced into the inner wall or formed on the inner wall. This can be done, for example, by etching, embossing, by machining, by a generative
  • the structure is formed in several parts with the inner wall.
  • the structure is formed on an additional element, in particular an insert element or insert element, which is connected to the inner wall in the first surface region.
  • Insertion element can be formed.
  • the insert element or insert element can for example be soldered to the inner wall, welded or fastened there in another suitable manner.
  • the structure has a plurality of structural elements, wherein the structural elements may be elevations and / or depressions, wherein the structural elements - seen in longitudinal section - spheroidal, that is approximately spherical or spherical, in particular hemispherical, the is in particular hemispherical, are formed.
  • a longitudinal section is here a sectional plane understood in the - in on a
  • a longitudinal direction of the pre-chamber is understood in particular to be the direction which preferably also corresponds to the longitudinal direction of a
  • Igniter corresponds to the internal combustion engine.
  • the structural elements - seen in longitudinal section - are formed triangular or tooth-shaped, wherein they preferably have a sharp or a rounded tip.
  • a triangular or toothed shape of the structural elements is particularly responsive to the fact that they have a tip, which of the flowed surface turned away and facing the interior of the antechamber. This tip can be sharp-edged or - especially with a certain corner radius, which represents the radius of curvature of the tip - be rounded.
  • Such triangular or tooth-shaped structural elements can act in particular as breaking edges for a gas flow flowing along the surface.
  • plan view - is preferably provided that the structural elements - seen in plan view - are circular.
  • a plan view in particular indicates a viewing direction perpendicular to the flowed-on surface - in particular, as it were, from a center of the interior of the pre-chamber.
  • the structural elements - seen in plan view - are elliptical or oval.
  • Structural elements in which the tip is then an edge of the rectangle or square, which in longitudinal section is a tip.
  • the structural elements - seen in plan view - are teardrop-shaped.
  • a drop shape is particularly responsive to a shape in which a width of the structural elements - seen in the longitudinal direction - varies.
  • the structural elements are preferably in an upper region of a respective one
  • Structural element less wide than in a lower portion of the same structural element.
  • the term “down” here refers to a side of the structural element, which faces the main combustion chamber in the assembled state, while the term “top” one side of the
  • the structural elements - seen in plan view - are triangular.
  • the concrete forms and / or geometries proposed here for structural elements are particularly suitable for acting as breaking edges or turbulences for the
  • a width preferably denotes a dimension which is measured in the plan view along a direction which is perpendicular to the longitudinal direction.
  • the structural elements preferably have a height (in particular in the case of elevations) or a depth (in particular in the case of depressions) of at least 0.02 mm to at most 2 mm.
  • the height or depth is measured, in particular in the longitudinal section plane and perpendicular to a mean surface contour of the flowed surface, in each case from a highest point of a structural element to a lowest point of the structural element.
  • the structural elements have a length of at least 0.04 mm to at most 4 mm.
  • a length is a measure, which in turn is measured in plan view, along the extent of
  • Structural elements in the longitudinal direction ie in particular perpendicular to the width.
  • circular structural elements have in particular a width perpendicular to the longitudinal direction and a length in the longitudinal direction.
  • the structural elements have a-preferably shortest-distance from each other of at least 0.02 mm to at most 1 mm, preferably from at least 0.04 mm to at most 1 mm.
  • immediately adjacent structural elements preferably have a shortest distance from each other in one of said regions.
  • the structural elements have a corner radius or radius of curvature of at least 0.01 mm to at most 1 mm. This applies in particular to triangular or tooth-shaped structural elements which have a rounded tip, the corner radius or radius of curvature of the tip being addressed here.
  • the object is also achieved by providing an internal combustion engine having an antechamber according to one of the previously described embodiments.
  • the advantages which have already been described in connection with the prechamber arise in connection with the internal combustion engine.
  • the internal combustion engine is designed as a gas engine.
  • the internal combustion engine is particularly preferably as a mixture-compressing gas engine
  • the internal combustion engine is preferably designed as a lean-burn gas engine. It is therefore preferably operated with a lean combustion air / fuel gas mixture in the main combustion chamber and / or in the prechamber. It is possible that the
  • Prechamber is designed as a rinsed prechamber, wherein the mixture present in the prechamber is enriched via a separate fuel supply for the prechamber.
  • the mixture in the pre-chamber regardless of its absolute composition - in any case, a less lean composition than the mixture in the main combustion chamber.
  • the internal combustion engine is designed as a stationary gas engine.
  • the internal combustion engine is preferably operated permanently in a stationary operating point, for example when driving a generator for generating electrical power and / or when driving feed pumps, for example in the field of promoting fossil raw materials. It arise in this case of Operating cycle to cycle or cycle to cycle in the internal combustion engine, apart from any standing or running pressure waves in a fuel supply, in the charging path and / or in the exhaust path constant combustion conditions due to the steady-state operating point.
  • the internal combustion engine is preferably designed as a reciprocating engine. It is possible that the internal combustion engine is arranged to drive a passenger car, a truck or a commercial vehicle. In a preferred embodiment, the internal combustion engine is the drive in particular heavy land or water vehicles, such as mine vehicles, trains, the internal combustion engine in a
  • Locomotive or a railcar is used, or by ships. It is also possible to use the internal combustion engine to drive a defense vehicle, for example a tank.
  • An exemplary embodiment of the internal combustion engine is preferably also stationary, for example, for stationary power supply in emergency operation,
  • the internal combustion engine in this case preferably drives a generator. Also a stationary application of
  • Internal combustion engine for driving auxiliary equipment such as fire pumps on oil rigs
  • an application of the internal combustion engine in the field of promoting fossil raw materials and in particular fuels, for example oil and / or gas possible.
  • the internal combustion engine is also possible to use the internal combustion engine in the industrial sector or in the field of construction, for example in a construction or construction machine, for example in a crane or an excavator.
  • the internal combustion engine is preferably designed as a diesel engine, as a gasoline engine, as a gas engine for operation with natural gas, biogas, special gas or another suitable gas.
  • the internal combustion engine is designed as a gas engine, it is suitable for use in a cogeneration plant for stationary power generation.
  • the object is also achieved by providing a method for designing and / or producing a pre-chamber for an internal combustion engine, which has the following steps: It is a pre-chamber geometry with a flowed during operation of the prechamber Surface, which is arranged in an interior of the antechamber, provided.
  • Gas flow in the interior of the prechamber is simulated.
  • a surface area suitable for applying the gas flow to the surface with a view to stabilizing the gas flow is identified, in particular by means of the simulation.
  • a particular structure is provided in the surface area, wherein the particular structure is provided so that the gas flow in the region of the particular structure abuts the surface.
  • the geometry of an existing or projected pre-chamber - even without the specific structure - is provided, preferably in the form of machine-readable data, such that the simulation can be performed on the basis of the pre-chamber geometry provided.
  • the simulation of the gas flow in the interior of the prechamber is carried out in particular for its operation during one or more compression strokes of an internal combustion engine which is operated with the prechamber. In the context of the simulation, it is thus considered how the gas flow behaves in the compression stroke of the internal combustion engine in the interior of the prechamber. In particular, cyclical changes in one
  • Flow field can be examined in the prechamber, and / or it is possible to identify areas of the prechamber, which are decisive for the formation of the flow field.
  • areas of the prechamber which are decisive for the formation of the flow field.
  • a surface area suitable for applying the gas flow to the surface can be identified, for example, by finding a surface area determining the formation of the gas flow within the scope of the simulation and identifying it as a suitable surface area. If not, especially one
  • rotationally symmetrical prechamber - a suitable surface area can also be identified by tentatively arranging a specific structure - or even a plurality of specific structures - at different surface areas of the prechamber will be, and each of the gas flow in the interior of the antechamber is examined by repeated simulation for the different surface areas. Comparing the results of these different simulations will then allow at least one
  • Surface area to be identified which is in terms of stabilization and - seen from cycle to cycle - equalization of the flow field within the prechamber, this may be a particular surface area in which the arrangement of the particular structure in this surface area leads to a Fluctuation in the design of the flow field from cycle to cycle is minimal. It can alternatively or additionally also be investigated in which surface area and / or at which specific structure the gas flow applies particularly strongly to the surface in the region of the specific structure.
  • the surface area for applying the gas flow to the surface is particularly suitable or favorable means, in particular, that a specific structure arranged in this surface area-as already explained-leads in a special way to a stabilization of the gas flow in the interior of the pre-chamber. Furthermore, the favorable or suitable property of the surface area relates in particular to a
  • Preparation of the antechamber are provided in order to produce a pre-chamber with the specific structure in the surface region can. It is therefore in particular as
  • the antechamber is produced in the context of the method. This includes, on the one hand, that a specific structure is arranged in an existing prechamber in a specific surface area, for example by surface treatment of an inner wall of the prechamber, in particular by etching, embossing, machining, generative application or other suitable measures, or by arranging an insert or inserter in the pre-chamber having the particular structure. But it is also possible that the antechamber is made from scratch, with the particular structure being arranged or formed in the first surface area.
  • the surface area and / or the particular structure is / are particularly selected so that a force acting on the gas flow by a local pressure drop in the surface area is greater than the forces that are cyclically changing
  • Influencing variables on the gas flow arise.
  • a cyclically insensitive flow pattern can be created within the antechamber in relation to these influencing variables.
  • pre-chamber and the internal combustion engine on the one hand and the method on the other hand are to be understood complementary to each other.
  • Features of the pre-chamber and / or the internal combustion engine, which have been explained explicitly or implicitly in connection with the method, are preferably individually or combined with one another Features of a preferred embodiment of the prechamber or the internal combustion engine.
  • Steps which have been explained explicitly or implicitly in connection with the prechamber and / or the internal combustion engine are preferably individually or combined with one another Steps of a preferred embodiment of the method. This is preferably characterized by at least one method step, which by at least one feature of an inventive or preferred embodiment of the pre-chamber or the
  • Internal combustion engine is conditional.
  • Figure 1 is a schematic representation in two views of an exemplary embodiment of an antechamber
  • Figure 2 is a plurality of views of various embodiments of certain
  • Fig. 1 shows an embodiment of a pre-chamber 1 of an internal combustion engine 2, wherein the pre-chamber 1 in Figure 1 a) in a first longitudinal section plane and in Figure 1 b) in a second, about a longitudinal axis L relative to the first longitudinal section plane rotated longitudinal sectional plane is shown in half section ,
  • the prechamber 1 for the internal combustion engine 2 has a surface 3 which has flowed during operation of the prechamber 1 and which is arranged in an interior 5 of the prechamber 1.
  • the flowed-on surface 3 has a first surface region 7 and a second surface region 9, the first surface region 7 having a specific structure 11, and the second surface region 9 being free of this structure 11, that is to say the specific structure 11 does not have.
  • the surface 3 in the second surface area 9 is unstructured and / or smooth.
  • the second surface area 9 preferably extends - as seen in the circumferential direction - from a first side of the first surface area 7 in FIG. 1a to a second left-hand side of the first surface area 7, that is, almost fully to on a peripheral portion by the first surface portion 7 is arranged. But it is also possible that the surface 3 has more than a first surface area 7.
  • a longitudinal direction extends in the direction of the longitudinal axis L shown in Figure lb).
  • a circumferential direction concentrically surrounds the longitudinal direction.
  • a radial direction is perpendicular to the longitudinal direction.
  • the surface 3 is designed here as the surface of an inner wall 13, wherein the
  • Figure lb) it is shown that the particular structure 1 1 is formed here in one piece with the inner wall 13, wherein it is preferably worked directly into the surface 3 or worked out of this.
  • the interior 5 of the prechamber 1 is known per se a
  • the interior 5 is connected via at least one bore, here specifically via a riser channel 19 and side channels 21 with a main combustion chamber, not shown, in the state of the pre-chamber 1 mounted on the internal combustion engine 2.
  • Fluctuations, in particular cyclical fluctuations in the operation of the internal combustion engine 2 is insensitive.
  • the specific structure 11 is arranged in the first surface area 7, in which a main flow of the gas flow directly adjoins the surface 3. Local turbulences are formed and the local turbulence kinetic energy is increased. This leads to a local pressure drop along the structured surface region 7. This local pressure drop results in a force on the gas flow which leads to the application to the structured surface region 7.
  • the particular structure 1 1 is selected so that this force is greater than forces which result from cyclically changing influencing variables, so that a cyclically insensitive flow pattern within the pre-chamber 1 is formed with respect to these influencing variables.
  • FIG. 2 shows representations of a plurality of embodiments of certain structures 1 1.
  • the same and functionally identical elements are provided with the same reference numerals, so reference is made in this respect to the preceding description.
  • the particular structure 1 1 preferably has a plurality of structural elements 23, which may be formed in particular as elevations and / or depressions.
  • FIGS. 2 a), 2 b) and 2 c) each show longitudinal sections through specific structures 1 1.
  • the structural elements 23 are in particular hemispherical, and thus hemispherical.
  • the structural elements 23 are likewise triangular or tooth-shaped, as seen in longitudinal section, but have a rounded tip 25 with a corner radius or radius of curvature.
  • the corner radius or radius of curvature is preferably from at least 0.01 mm to at most 1 mm.
  • a height H of the structural elements 23, which is shown here by way of example in FIG. 2 b), is generally, irrespective of the specific shape of the structural elements 23, preferably of at least 0.02 mm to at most 2 mm. The same applies preferably to a depth of structural elements that are not formed as elevations, but as depressions.
  • a distance of adjacent structural elements 23 from each other, which is identified by way of example in Figure 2c) with A, is - again regardless of the specific form of
  • Structural elements 23 - preferably from at least 0.02 mm to at most 1 mm, preferably from at least 0.04 mm to at most 1 mm.
  • the shortest distance - regardless of the direction in which it extends - is considered in principle between directly adjacent structural elements 23.
  • Figures 2d) to 2h) show views of certain structures 1 1 in plan view, thus in the same view, which is also the representation of Figure l a) is based.
  • the structural elements 23 in the exemplary embodiment according to FIG. 2d) are of circular design.
  • the structural elements 23, which are shown in FIGS. 2d) and e), can in particular be designed in longitudinal section as shown in FIG. 2a).
  • FIG. 2f shows an exemplary embodiment of the specific structure 11, in which the structural elements 23-seen in plan view-have a rectangular shape, in particular a square shape. In particular, they may be designed as seen in longitudinal section, as shown in FIGS. 2 b) or 2 c).
  • FIG. 2g shows an exemplary embodiment of the specific structure 11, in which the structural elements 23 have a teardrop shape.
  • the structural elements 23 are preferably designed to be narrower, in particular at an upper end facing the ignition device 15, than at a lower, the ignition device 15 and a main combustion chamber (not shown)
  • Figure 2h shows an embodiment of the particular structure 1 1, in which the
  • Structural elements 23 are triangular in shape.
  • the teardrop-shaped structural elements 23 according to FIG. 2g) can-as seen in longitudinal section-be designed as shown in FIG. 2a), but it is also possible that they are configured as shown in FIG. 2b) or 2c) ,
  • Structural elements 23 according to FIG. 2h) are - as seen in longitudinal section - preferably designed as shown in one of the figures in FIG. 2b) or 2c).
  • the structural elements 23 shown in FIG. 2b), which are seen in plan view, preferably have a diameter of at least 0.02 mm to at most 2 mm.
  • the structural elements 23 preferably have a width of at least 0.02 mm to at most 2 mm measured perpendicular to the longitudinal axis L and horizontal in the image plane of FIG. 2.
  • the width extends in particular perpendicular to a
  • the structural elements 23 preferably have a length-seen along the longitudinal direction or along a projection of the longitudinal direction L onto the surface 3 -which is shown in FIG. 2 in the image plane in the vertical direction, which is from at least 0.04 mm to at most 4 mm.
  • the length extends substantially in the direction of a main flow direction of the gas flow in the interior 5 during a compression stroke of the internal combustion engine 2.
  • the drop-shaped structural elements 23 according to FIG. 2g) preferably have a corner radius or radius of curvature in the corners of at least 0.01 mm to at most 1 mm.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

L'invention concerne une chambre de précombustion (1) pour un moteur à combustion interne (2), comportant une surface (3) alimentée lorsque la chambre de précombustion (1) fonctionne, qui est agencée dans la partie intérieure (5) de la chambre de précombustion (1). Selon l'invention, la surface (3) présente au moins une première partie de surface (7) et au moins une seconde partie de surface (9), la première partie de surface (7) présentant un structure (11) déterminée, la seconde partie de surface (9) n'étant pas munie de ladite structure (11).
EP16781286.6A 2015-10-21 2016-10-06 Chambre de précombustion pour un moteur à combustion interne, moteur à combustion interne muni de ladite chambre de précombustion, et procédé de conception et/ou de fabrication de ladite chambre de précombustion Withdrawn EP3365541A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015220539.8A DE102015220539B4 (de) 2015-10-21 2015-10-21 Vorkammer für eine Brennkraftmaschine, Brennkraftmaschine mit einer solchen Vorkammer und Verfahren zum Auslegen und/oder Herstellen einer solchen Vorkammer
PCT/EP2016/001657 WO2017067637A1 (fr) 2015-10-21 2016-10-06 Chambre de précombustion pour un moteur à combustion interne, moteur à combustion interne muni de ladite chambre de précombustion, et procédé de conception et/ou de fabrication de ladite chambre de précombustion

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EP3365541A1 true EP3365541A1 (fr) 2018-08-29

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EP16781286.6A Withdrawn EP3365541A1 (fr) 2015-10-21 2016-10-06 Chambre de précombustion pour un moteur à combustion interne, moteur à combustion interne muni de ladite chambre de précombustion, et procédé de conception et/ou de fabrication de ladite chambre de précombustion

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US (1) US10563568B2 (fr)
EP (1) EP3365541A1 (fr)
CN (1) CN108474289B (fr)
DE (1) DE102015220539B4 (fr)
WO (1) WO2017067637A1 (fr)

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DE102017204241A1 (de) * 2017-03-14 2018-09-20 Dkt Verwaltungs-Gmbh Vorkammerzündkerze
US20200182217A1 (en) * 2018-12-10 2020-06-11 GM Global Technology Operations LLC Combustion ignition devices for an internal combustion engine
DE102019212763A1 (de) * 2019-08-26 2021-03-04 Ford Global Technologies, Llc Zündkerze mit Strukturelementen an der Innenoberfläche der Vorkammer
AT523918B1 (de) * 2020-08-10 2022-01-15 Avl List Gmbh Zylinderkopf
DE102021202063A1 (de) 2021-03-03 2022-09-08 Robert Bosch Gesellschaft mit beschränkter Haftung Vorkammerzündkerze mit verbessertem Aufheizverhalten
DE102022104298B3 (de) 2022-02-23 2023-05-25 Jan Leberwurst Zündaggregat und Verbrennungsmotor mit Zündaggregat

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Also Published As

Publication number Publication date
US10563568B2 (en) 2020-02-18
US20180313256A1 (en) 2018-11-01
CN108474289A (zh) 2018-08-31
DE102015220539A1 (de) 2017-04-27
WO2017067637A1 (fr) 2017-04-27
DE102015220539B4 (de) 2017-06-01
CN108474289B (zh) 2021-03-09

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