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
  • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
  • F01D5/12—Blades
  • F01D5/14—Form or construction
  • F01D5/141—Shape, i.e. outer, aerodynamic form
  • F01D5/145—Means for influencing boundary layers or secondary circulations
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
• • 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
  • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
  • F01D5/005—Repairing methods or devices

Definitions

• the invention relates to a method for producing a flow-guiding component, which has a flow-over or overflow area. However, the invention also relates to such a flow-guiding component itself.
• Flow-conducting components may be, for example, turbomachines or pipes or pipelines.
• Turbomachines can e.g. be designed as a gas turbine, steam turbine or the like.
• a medium e.g., gas or vapor
• Pipelines are mainly used to transport a medium from one place to another. Both in turbomachines and in pipelines it is observed that considerable frictional losses occur due to the friction of the respective medium on surfaces which are overflowed or overflowed so that the energy inherent or supplied to the medium is partially lost by friction losses or turbulences. As a result, the efficiency of the flow machines mentioned by way of example is considerably reduced, since the flow resistances are too high.
• Overflowed areas are e.g. Inner walls of housings of turbomachinery, shaft surfaces or inner walls of pipelines.
• the invention has for its object to provide a simple means improved process for the preparation of a flow-guiding component and a simple means improved flow-guiding component available, so that the flow resistance of the recirculated or overflowed surfaces further lowered and in particular the efficiency of Turbomachines is further increased.
• the solution of this object succeeds according to the invention with a method and a flow-guiding component of the type mentioned in that the um- or overflow area is at least partially processed so that it has a sharkskin effect-generating surface structure.
• the invention is based on the recognition that bionics, ie the combination of nature and technology, can make use of the functions of nature for high technologies.
• the surface structure according to the invention with the advantageous sharkskin effect advantageously brings about a reduction in the flow resistance at the surfaces which are flown over or overflow, so that in particular the turbomachines have a higher efficiency.
• the surfaces around or overflow are provided, at least in regions, with fine grooves running in the flow direction of the medium, which advantageously largely prevent, for example, turbulence.
• the sharkskin effect generating surface structure may also be provided on the entire component, which is particularly favorable on the inner walls of pipelines.
• the surface structure with the sharkskin effect can preferably be arranged on surfaces which are overflowed or overflowed and on which a correspondingly high flow velocity of the medium is present.
• the sharkskin effect-producing surface structure In order to produce the sharkskin effect-producing surface structure, it is favorable for the purposes of the invention, when the sharkskin effect-producing surface structure of the machining over- or overflow area is removed in a preferred embodiment of the method.
• the surface to be processed or overflowed surface is first provided with a layer of a suitable material, which is preferably removed by means of etching.
• the layer should consist of a material adapted to the application, in particular the operating conditions of the flow-guiding component should be considered.
• turbomachines are operated in the execution of a steam turbine as high-pressure, medium-pressure and / or low-pressure turbines in different temperature ranges.
• the layer must therefore be able to withstand these relatively high temperatures, since the layer is not completely removed, but instead is provided correspondingly with fine grooves extending in the direction of flow in order to produce the sharkskin effect-producing surface structure.
• the layer is of course connected with its side facing away from the medium sufficiently with the surface to be processed or flowed over.
• the layer can be applied to the relevant surfaces or to the surfaces to be processed, wherein the etchant is passed through the corresponding component.
• the etchant attacks the corresponding sites to be processed, thus creating the sharkskin effect-producing surface structure.
• the etchant directly at the desired locations, without a separate layer is provided to produce the sharkskin effect-generating surface structure.
• the relevant circumscribed or overflowed surface could then be manufactured according to material technology, so that the etchant can act accordingly here.
• the layer or the material is designed or adjusted in such a way that these or , has these areas in which the etchant used removes a larger amount than in other areas.
• elevations and depressions result in the layer on its side facing the medium, so that the fine grooves running in the direction of flow result.
• the elevations and depressions or the fine grooves have an amount in the mycrometer range ( ⁇ m).
• the layer in its unprocessed state also has only a thickness in the mycrometer range ( ⁇ m), so that a narrowing of the effective passage cross-section is negligible.
• the sharkskin effect-producing surface structure is removed by mechanical means.
• the surface around or overflowed could be processed by grinding technology.
• the sharkskin effect-producing surface structure is applied to the surfaces overflowed or overflowed. It would be possible, e.g. an application of the sharkskin effect-producing surface structure on a film, which is sufficiently connected to the flow or overflow areas. Of course, care must be taken to a suitable operating conditions adapted to the type of connection or to a suitable connection means.
• the use of the sharkskin effect-producing surface structure is particularly suitable in turbomachines and pipelines as flow-guiding components with correspondingly high flow rates.
• the preferred removal (etching) produces fine grooves running in the direction of flow, so that transverse flows are reduced and edge losses are reduced.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• ing And Chemical Polishing (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=38068312

Family Applications (1)

Country Status (1)

Cited By (4)

Citations (6)

• 2006
  • 2006-11-23 EP EP06024324A patent/EP1925779A1/fr not_active Withdrawn

Patent Citations (6)

Similar Documents

Legal Events