WO2024256775A1 - Traitement de carter non axisymetrique avec plenum ondule - Google Patents
Traitement de carter non axisymetrique avec plenum ondule Download PDFInfo
- Publication number
- WO2024256775A1 WO2024256775A1 PCT/FR2024/050756 FR2024050756W WO2024256775A1 WO 2024256775 A1 WO2024256775 A1 WO 2024256775A1 FR 2024050756 W FR2024050756 W FR 2024050756W WO 2024256775 A1 WO2024256775 A1 WO 2024256775A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slots
- annular wall
- cavity
- circumferential direction
- casing
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/246—Fastening of diaphragms or stator-rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/526—Details of the casing section radially opposing blade tips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
- F04D29/547—Ducts having a special shape in order to influence fluid flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/685—Inducing localised fluid recirculation in the stator-rotor interface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/10—Stators
- F05D2240/11—Shroud seal segments
Definitions
- the present invention relates to the general field of turbomachine compressors, and more particularly to the treatment of the casing of turbomachine compressors.
- Turbomachine compressors consist of blades rotating inside a casing which seals the air stream with the outside of the engine.
- this clearance can modify and degrade the operation of the compressor until the appearance of a surge phenomenon which results from the air flow being disconnected from the surface of the blades. Controlling the airflow at the tip of the blades is a major challenge in order to obtain both good aerodynamic efficiency of the compressor and a sufficient margin against the surge phenomenon.
- the internal surface of the casing can be treated locally by digging slots arranged in the thickness of the casing opposite the blades.
- the casing treatments considered in the present invention are of the "axial slot” type corresponding to a series of slots arranged along the circumference of the casing (in the azimuthal direction). These slots are located vertically ("above") a compressor wheel. These treatments are therefore non-axisymmetric by relative to the compressor rotation axis: this is therefore non-axisymmetric casing treatment or TCNA.
- the presence of these slots will locally modify the flow.
- the objective is to influence the appearance of the mechanisms responsible for the compressor starting to surge.
- An effective crankcase treatment will increase the compressor's operability range by delaying the appearance of these mechanisms, in particular by reducing aerodynamic blocking at the wheel head.
- Some TCNA concepts propose the addition of an annular cavity or "plenum" in the casing as described for example in document WO9420759, which amounts to adding a cavity above the slots. This cavity extends over the entire circumference of the casing and connects the slots together. This cavity is not directly open to the vein and is not connected to a secondary air circuit. The fluid must pass through the slots to enter and exit the cavity.
- the addition of the plenum tends to amplify the ability of the TCNA to increase the pumping margin.
- the annular cavity is useful to allow a fraction of fluid to be taken through one slot and reinjected through different slots, which improves the efficiency of the crankcase treatment (compared to a crankcase treatment without an annular cavity).
- this mechanism is not optimal because the reinjection is distributed among several slots and some of these slots are not in a good position relative to the rotor at the time of reinjection.
- the invention proposes a turbomachine compressor casing comprising an inner annular wall and an outer annular wall delimiting between them an annular cavity, the annular cavity extending in an axial direction between a front bottom and a rear bottom and in a radial direction between an inner face of the outer annular wall and an outer face of the inner annular wall, the inner annular wall of the casing comprising a plurality of slots opening into the annular cavity, the slots being arranged next to each other in a circumferential direction, the slots extending lengthwise along a longitudinal axis between the front bottom and the rear bottom in the axial direction, characterized in that the internal face of the external annular wall facing the plurality of slots of the internal annular wall comprises concave portions and convex portions arranged alternately in the circumferential direction so as to define in the internal cavity undulations in said circumferential direction, the concave portions and the convex portions each extending between the front bottom and the rear bottom of the internal cavity in a longitudinal direction, in that said longitudinal
- the concave portions and the convex portions each extend between the front bottom and the rear bottom of the internal cavity in a longitudinal direction forming a non-zero angle with the longitudinal axis of the slots
- the concave portions forming circulation channels for the flow in the internal cavity make it possible to offset the sampling zone and the reinjection zone of the fluid at the slots.
- the concave portions and the convex portions each extend between the front bottom and the rear bottom of the internal cavity in a longitudinal direction parallel with the longitudinal axis of the slots and with each corrugation extending in the circumferential direction over two or more adjacent slots, it is also possible to have an exchange between several adjacent slots in the same circulation channel for the flow in the cavity. internal and to shift the sampling zone and the reinjection zone of the fluid at the level of the slots.
- TCNA non-axisymmetric casing treatment
- the non-zero angle formed between the longitudinal direction of the concave portions and the convex portions and the longitudinal axis of the slots is between -60° and +60°, preferably between -40° and +40°.
- each concave portion in the case of a non-zero angle formed between the longitudinal direction of the concave portions and the convex portions and the longitudinal axis of the slots, each concave portion has a width at least equal to a width of a slot in the internal annular wall.
- the number of undulations present on the internal face of the external wall is between 0.1 and 1 times the number of slots present in the internal annular wall.
- the amplitude of the undulations formed by the concave portions and the convex portions arranged alternately in the circumferential direction is between 0.2 and 5 times the height of the slots in the internal annular wall.
- the casing comprises a treatment ring comprising the internal annular wall and a master ring. comprising the outer annular wall, the treatment ring being fixed on the master ring.
- the treatment ring and the master ring are made of the same material.
- the invention also relates to a turbomachine compressor comprising a casing according to the invention.
- Figure 1 is a schematic perspective view of a turbomachine compressor according to one embodiment of the invention.
- Figure 2 is a schematic and partial view showing corrugations present on the internal face of the master ring of the compressor of Figure 1,
- Figure 3 is a schematic and partial view of the compressor housing of Figure 1,
- Figure 4 is a radial sectional view along section plane IV-IV on the housing of Figure 3,
- Figure 5 is a radial sectional view along the section plane V-V on the housing of Figure 3.
- FIG. 1 shows a turbomachine compressor 300 according to one embodiment of the invention.
- the compressor 300 comprises around its axis A 300 a rotor 200 equipped with a plurality of mobile blades 210 surrounded by a casing 100.
- the housing 100 includes a treatment ring 110 and a master ring 120 that is structural.
- the treatment ring 110 includes a flange 116 that is secured to a flange 126 of the master ring 120.
- the master ring 120 comprises an outer annular wall 121 while the treatment ring 110 comprises an inner annular wall 111 facing the outer annular wall 121.
- the inner annular wall 111 and the outer annular wall 121 each extend in length in a circumferential direction D c , in width in an axial direction D A corresponding to the axis of the compressor 300 and in thickness in a radial direction D R .
- the inner annular wall 111 and the outer annular wall 121 delimit between them an annular cavity 130 forming a plenum.
- the internal annular cavity 130 extends in the axial direction D A between a front bottom 131 and a rear bottom 132 and in the radial direction D R between an internal face 1210 of the external annular wall 121 and an external face 1111 of the internal annular wall 111.
- the inner annular wall 111 comprises a plurality of slots 115 hollowed out (or cut out) in the thickness of the wall, each slot 115 opens onto both an inner face 1110 and the outer face 1111 of the inner annular wall 111 so as to place a flow vein E in communication with the annular cavity 130, the arrow E indicating the direction of flow in the compressor and, consequently, the upstream and downstream sides thereof.
- the slots 115 are arranged uniformly next to each other in the inner annular wall 111 in the circumferential direction D c .
- Each slot 115 extends in length along a longitudinal axis Ans over a determined length Lus and in height along the radial direction D R over a height Hn 5 .
- the longitudinal axis Ans of the slots 115 is parallel to the axial direction D A . However, it can form an angle with the axial direction D A of between -60° and +60°.
- the slots 115 are inclined by 45° relative to the radial direction D R .
- the slots 115 may be inclined by an angle other than 45° or be parallel to the radial direction D R .
- the slots 115 and the annular cavity 130 into which they open constitute a non-axisymmetric casing treatment or TCNA which makes it possible to locally modify the flow in order to reduce the mechanisms responsible for the compressor starting to surge.
- the internal face 1210 of the external annular wall 121 facing the plurality of slots 115 of the internal annular wall 111 comprises concave portions 1212 and convex portions 1213 arranged alternately in the circumferential direction D c so as to define in the internal cavity 130 undulations in the circumferential direction De (FIGS. 2, 4 and 5).
- the concave portions 1212 and the convex portions 1213 each extend between the front bottom 131 and the rear bottom 132 of the internal cavity 130 in a longitudinal direction D ⁇ o.
- the concave portions 1212 define circulation channels for channeling the flow into the internal cavity 130.
- the longitudinal direction of the concave portions 1212 and convex portions 1213 forms an angle p W o with the longitudinal axis Al 15 of the slots 115.
- the angle p M o is between -60° and +60°, preferably between -40° and +40°.
- the concave portions forming circulation channels for the flow in the internal cavity it is thus possible to offset the sampling zone and the reinjection zone of the fluid at the slots.
- the angle Pwo it is possible to determine the slot(s) from which the fluid is sampled in the internal cavity and the slot(s) from which the fluid is reinjected.
- FIGS. 4 and 5 An example of an offset between the sampling zone and the reinjection zone in the internal cavity is illustrated in FIGS. 4 and 5 which correspond to radial sections of the casing of FIG. 3.
- the section plane of FIG. 4 is located upstream of the leading edge 211 of the blades 210 of the rotor 200 in the axial direction and intersects the slots 115 in their upstream part.
- the section plane of FIG. 5 is located downstream of the leading edge 211 of the blades 210 of the rotor 200 in the axial direction and intersects the slots 115 in their downstream part.
- the slots 115i to 115 6 shown in FIGS. 4 and 5 correspond to the same slots in the internal annular wall 111.
- the concave portion 1212i has a different azimuthal position between FIGS. 4 and 5 due to the angle (3I 4 O formed between the longitudinal direction DI 40 of the concave and convex portions and the longitudinal axis An 5 of the slots which here coincides with the axial direction D A corresponding to the axis of the compressor 300 (FIG. 3).
- the angle P140 is approximately 37°.
- a fraction F E of the flow is taken by the slots 115 4 and 115 5 as shown in FIG. 5.
- the fraction F E is then channeled into the circulation channel 136 to be reinjected into the flow vein E by the slots 115 3 and 115 4 as shown in FIG. 4.
- the inclined concave portions make it possible to channel the flow so that it passes from the slot 115 s to the slot 115 3 as it passes through the internal cavity, i.e. with an azimuthal offset of two slots in the example considered here.
- Each concave portion 1212 has a width I1212 at least equal to a width ln 5 of the slots 115 (figures 2 and 3).
- the amplitude of the undulations corresponding to the height H 1212 of the concave portions 1212 is between 0.2 and 5 times the height Hn 5 of the slots 115 (figures 3 and 4).
- the number of ripples is between 0.1 and 1 times the number of slots 115 present on the treatment ring 110.
- the number of slots 115 present on the treatment ring 110 is between 2 and 10 the number of blades 210 of the rotor 200.
- the number of slots can typically be 5 for a blade.
- the master ring and the treatment ring are preferably made of the same material or of materials having similar thermal expansion coefficients in order to avoid differential expansions between the two rings which could lead to mechanical stresses and/or sealing problems in the casing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24738012.4A EP4724683A1 (fr) | 2023-06-12 | 2024-06-10 | Traitement de carter non axisymetrique avec plenum ondule |
| CN202480038904.5A CN121336035A (zh) | 2023-06-12 | 2024-06-10 | 具有波纹状增压部的非轴对称壳体的处理 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR2305914 | 2023-06-12 | ||
| FR2305914A FR3149650B1 (fr) | 2023-06-12 | 2023-06-12 | Traitement de carter non axisymétrique avec plenum ondulé |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024256775A1 true WO2024256775A1 (fr) | 2024-12-19 |
Family
ID=89068670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2024/050756 Ceased WO2024256775A1 (fr) | 2023-06-12 | 2024-06-10 | Traitement de carter non axisymetrique avec plenum ondule |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4724683A1 (fr) |
| CN (1) | CN121336035A (fr) |
| FR (1) | FR3149650B1 (fr) |
| WO (1) | WO2024256775A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245312A (en) * | 1984-06-19 | 1992-01-02 | Rolls Royce Plc | Axial flow compressor surge margin improvement |
| WO1994020759A1 (fr) | 1993-03-11 | 1994-09-15 | Central Institute Of Aviation Motors (Ciam) | Moyen de traitement antiblocage d'extremites |
| GB2408546A (en) * | 2003-11-25 | 2005-06-01 | Rolls Royce Plc | Compressor casing treatment slots |
| DE102007056953A1 (de) * | 2007-11-27 | 2009-05-28 | Rolls-Royce Deutschland Ltd & Co Kg | Strömungsarbeitsmaschine mit Ringkanalwandausnehmung |
| EP2143956A2 (fr) * | 2008-07-07 | 2010-01-13 | Rolls-Royce Deutschland Ltd & Co KG | Machine de traitement des écoulements dotée d'une rainure sur la trajectoire d'une extrémité d'aube |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1515000B1 (fr) * | 2003-09-09 | 2016-03-09 | Alstom Technology Ltd | Aubage d'une turbomachine avec un carenage contouré |
| DE102004032978A1 (de) * | 2004-07-08 | 2006-02-09 | Mtu Aero Engines Gmbh | Strömungsstruktur für einen Turboverdichter |
| US9726185B2 (en) * | 2013-05-14 | 2017-08-08 | Honeywell International Inc. | Centrifugal compressor with casing treatment for surge control |
| US10107307B2 (en) * | 2015-04-14 | 2018-10-23 | Pratt & Whitney Canada Corp. | Gas turbine engine rotor casing treatment |
| BE1023215B1 (fr) * | 2015-06-18 | 2016-12-21 | Techspace Aero S.A. | Carter a injecteurs de vortex pour compresseur de turbomachine axiale |
| US10648484B2 (en) * | 2017-02-14 | 2020-05-12 | Honeywell International Inc. | Grooved shroud casing treatment for high pressure compressor in a turbine engine |
-
2023
- 2023-06-12 FR FR2305914A patent/FR3149650B1/fr active Active
-
2024
- 2024-06-10 WO PCT/FR2024/050756 patent/WO2024256775A1/fr not_active Ceased
- 2024-06-10 EP EP24738012.4A patent/EP4724683A1/fr active Pending
- 2024-06-10 CN CN202480038904.5A patent/CN121336035A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2245312A (en) * | 1984-06-19 | 1992-01-02 | Rolls Royce Plc | Axial flow compressor surge margin improvement |
| WO1994020759A1 (fr) | 1993-03-11 | 1994-09-15 | Central Institute Of Aviation Motors (Ciam) | Moyen de traitement antiblocage d'extremites |
| GB2408546A (en) * | 2003-11-25 | 2005-06-01 | Rolls Royce Plc | Compressor casing treatment slots |
| DE102007056953A1 (de) * | 2007-11-27 | 2009-05-28 | Rolls-Royce Deutschland Ltd & Co Kg | Strömungsarbeitsmaschine mit Ringkanalwandausnehmung |
| EP2143956A2 (fr) * | 2008-07-07 | 2010-01-13 | Rolls-Royce Deutschland Ltd & Co KG | Machine de traitement des écoulements dotée d'une rainure sur la trajectoire d'une extrémité d'aube |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3149650A1 (fr) | 2024-12-13 |
| CN121336035A (zh) | 2026-01-13 |
| FR3149650B1 (fr) | 2025-06-13 |
| EP4724683A1 (fr) | 2026-04-15 |
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