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
  • F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
  • F01D5/187—Convection cooling
• • 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
  • F05D2240/12—Fluid guiding means, e.g. vanes
  • F05D2240/122—Fluid guiding means, e.g. vanes related to the trailing edge of a stator vane
• • 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
  • F05D2240/20—Rotors
  • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
  • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
• • 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
  • F05D2250/00—Geometry
  • F05D2250/10—Two-dimensional
  • F05D2250/18—Two-dimensional patterned
  • F05D2250/185—Two-dimensional patterned serpentine-like
• • 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
  • F05D2260/00—Function
  • F05D2260/20—Heat transfer, e.g. cooling
  • F05D2260/202—Heat transfer, e.g. cooling by film cooling
• • 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
  • F05D2260/00—Function
  • F05D2260/20—Heat transfer, e.g. cooling
  • F05D2260/221—Improvement of heat transfer
  • F05D2260/2212—Improvement of heat transfer by creating turbulence
• • 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
  • Y02T50/00—Aeronautics or air transport
  • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

• the invention relates to a cooled turbine blade according to the preamble of claim 1.
• a generic turbine blade with a wing profile from EP 0 735 240 Al is known.
• a plurality of mutually adjacent cooling channels are provided inside which a coolant flows are arranged in a meandering shape sequentially through ⁇ can flow.
• the cooling channels run in each case paral ⁇ lel to the front edge.
• Adjacent cooling channels are separated from one another by ribs, the ribs ending in a deflection region in which the adjacent cooling channels merge into one another.
• a turbine blade from US 5,246,340 which has a plurality of mutually parallel cooling channels in the interior.
• the cooling channels are each separated by a rib.
• In one of the ribs is in the area of
• Blade tip provided an adjacent two cooling channels opening through which a transverse flow can pass through for impingement cooling of the blade tip.
• GB 2 106 996 also discloses a turbine blade with a sheet-like impingement cooling insert.
• the object of the present invention is to provide a turbine blade whose life is further improved.
• the deflection of the cooling air flowing through the cooling channels is much more aerodynamic.
• the deflection is an integral part of the rib, so that the areas of lesser or no flow velocity ⁇ (dead water zones) can be eliminated in the deflection region.
• the flow rate is consequently kept approximately constant in that cooling passage to which the rib curves. Due to the curvature of the rib, however, an acute-angled corner area is created in the adjacent cooling channel, in which dead water areas could in turn be set. To now the dead water areas in the neighboring
• the two adjacent cooling channels connecting opening provided by the part of the coolant flow from one cooling channel into the other cooling channel can prematurely overflow or overflow.
• the casting of the tur- binenlaufschaufei casting apparatus used includes a casting core for the manufacture of the ⁇ position through which a coolant cavities having a meander shape disposed which core elements.
• a core support between two adjacent core elements may be provided, which after removal of the casting core leaves the opening within the curved rib from the gegos ⁇ Senen, integral turbine blade. This indicates a stabilized casting core, which increases the accuracy of the manufacturing process.
• the often frequently local overheating exposed end wall which is also referred to as the crown bottom
• the opening coolant jet are impact-cooled due to the passing through the opening coolant jet, so that also a particularly efficient cooling of the end wall can be done.
• only the opening to tilt so that their longitudinal extent is directed to the end wall.
• the rib adjacent to the trailing edge is curved in the region of the blade tip.
• the rib has a substantially constant rib thickness along its curvature.
• the inside of the end wall is equipped with turbulators, whereby the cooling of the end wall or the crown bottom can be improved in a simple manner.
• the adjacent cooling channels can be flowed through by a coolant sequentially or in parallel.
• care must be taken that there is a sufficient pressure gradient between them to maintain a coolant flow through the opening.
• the invention will be explained with reference to a drawing.
• the one ⁇ Zige FIGURE shows a longitudinal section through a dung OF INVENTION ⁇ modern turbine blade with meandering arrange ⁇ th cooling channels.
• the figure shows a produced by casting
• the thus-piece turbine blade 10 has a fir-tree-shaped in cross-section ⁇ attachment portion 12 having a platform 14 and an airfoil disposed thereon sixteenth
• the aerodynamically profiled in cross-section wing ⁇ profile 16 is formed by a suction-side blade wall and a pressure-side blade wall, each extending from a leading edge 18 to a trailing edge 20 and thereby enclose a arranged in the interior of the airfoil section 16 cavity in which a plurality of cooling channels 22a, 22b,
• the cooling passages 22 are adjacent to each other and each extending approximately parallel to the front of ⁇ derkante 18.
• the mutually adjacent cooling channels 22 are each joined by a pressure-side blade wall to the suction-side blade wall rib 24a, 24b, 24c in sections, separated from each other.
• the cooling channels 22 are delimited by an end wall 28.
• the end wall 28 is also referred to as the crown floor.
• the turbine blade 10 shown in the figure has a front edge-side cooling channel 22a on the mounting side, a coolant 29, for example, cooling air or Cooling steam, can be fed.
• a coolant 29 for example, cooling air or Cooling steam.
• the supplied cooling air cools the region of the front edge 18 of the airfoil 16 with gän ⁇ gigen ⁇ cooling methods, such as convection cooling, impingement cooling and / or film cooling.
• the coolant 29 which can be fed to the cooling channel 22b at the foot flows along the channel 22b to the wing tip 27 and is subsequently deflected in a deflection region 30 to reverse its flow direction, namely to the fastening region 12.
• the rib 24c adjacent to the trailing edge 20 is curved in the region of the wing tip 27 with the rib thickness D remaining the same.
• the curvature 32 is such that the rib 24c - viewed from the attachment region 12 to the tip region 26 - curves towards the front edge 18.
• an acute-angled corner region 34 is formed in the cooling channel 22d in the region of the wing tip 27.
• an opening 40 is provided in the region of the curvature 32 through which the coolant 29 flowing in the deflection region 30 can partly flow out of it and into the corner region 34 due to the pressure ratio that arises. Possibly. It is also possible to provide a plurality of openings 40 in order to more selectively influence the flow in the corner regions 34.
• the corner portion 34 can be sufficiently cooled. Areas with lower coolant flow rates and consequently with insufficient cooling are thus reliably avoided at this point.
• the coolant jet passing through the opening 40 impinges on the inside 42 of the end wall 28, thereby causing an impact cooling of the wing tip 27.
• turbulators 44 may be provided on the inner side 42 of the end wall 28, which bring about a further enlargement of the surface to be cooled.
• the BY- flowing along the inner side 42 of the end wall 28 the coolant 29 can further increase the cooling air side heat transfer coefficient due to the fanning ⁇ turbulence, whereby a further enhanced cooling of the crown ground can be achieved.
• the rib 24a in the tip region 26 of the turbine blade 10 according to the invention in the direction of the rear ⁇ edge 20 curved to pass into the end wall 28 and also to provide in the curvature one or more openings.
• the invention provides a turbine blade 10 for a, in particular stationary, axially flowed Gastur ⁇ bine, which is equipped with a mounting portion 12, a wing profile 16 and a plurality of inside the wing profile 16 meandering cooling channels 22.
• the invention proposes that at least one of the ribs 24 pendicke at constant rip-D in the area of the wing tip 27 to the leading edge 18 or trailing edge 20 toward curved, and that in the curvature 32 of the rib 24 at least one opening 40 is provided, through which a portion of the flowing in the deflection region 30 coolant 29 can pass into the adjacent cooling channel 22 d.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Separation By Low-Temperature Treatments (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37718882

Family Applications (1)

Country Status (10)

Families Citing this family (13)

Citations (4)

Family Cites Families (7)

• 2006
  • 2006-09-04 EP EP06018490A patent/EP1895096A1/de not_active Withdrawn
• 2007
  • 2007-06-27 AT AT07786865T patent/ATE458126T1/de active
  • 2007-06-27 DE DE502007002880T patent/DE502007002880D1/de active Active
  • 2007-06-27 CN CNA200780032783XA patent/CN101512106A/zh active Pending
  • 2007-06-27 ES ES07786865T patent/ES2340338T3/es active Active
  • 2007-06-27 JP JP2009525997A patent/JP2010502872A/ja active Pending
  • 2007-06-27 EP EP07786865A patent/EP2059655B1/de not_active Not-in-force
  • 2007-06-27 RU RU2009112405/06A patent/RU2410546C2/ru not_active IP Right Cessation
  • 2007-06-27 US US12/310,690 patent/US20090252615A1/en not_active Abandoned
  • 2007-06-27 PL PL07786865T patent/PL2059655T3/pl unknown
  • 2007-06-27 WO PCT/EP2007/056425 patent/WO2008028702A1/de not_active Ceased

Patent Citations (4)

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