Global Patent Index - EP 2071125 A1

EP 2071125 A1 20090617 - Single crystal turbine blade

Title (en)

Single crystal turbine blade

Title (de)

Einkristall-turbinenschaufel

Title (fr)

Aube de turbine monocristalline

Publication

EP 2071125 A1 20090617 (FR)

Application

EP 08171584 A 20081212

Priority

FR 0708751 A 20071214

Abstract (en)

The monocrystalline turbine blade for a wheel of a turbomachine, comprises a propeller (11) having a leading edge (BA), a lower face (FI), an upper face (FE), a trailing edge (BF), a skeleton (S) and longitudinal axis (ZZ), and a connection area (11E) between the propeller and the side of the blade. The blade is prepared by direct solidification of foundry parts. The sides (FI) and (FE) have a pass line, and respective lower pass (CI) and upper pass (CE) with respect to the adjacent blade in the turbomachine wheel of which it constitutes an element. The monocrystalline turbine blade for a wheel of a turbomachine, comprises a propeller (11) having a leading edge (BA), a lower face (FI), an upper face (FE), a trailing edge (BF), a skeleton (S) and longitudinal axis (ZZ), and a connection area (11E) between the propeller and the side of the blade. The blade is prepared by direct solidification of foundry parts. The sides (FI) and (FE) have a pass line, and respective lower pass (CI) and upper pass (CE) with respect to the adjacent blade in the turbomachine wheel of which it constitutes an element. An end part (20) of the propeller such as a stud or platform has a face of rib forming an angle with the longitudinal axis. The connection area extends around the leading edge between a point P1 located on the upper face of the blade and on the face of the upstream stud end with reference to the direction of the fluid flow and a point P3 located on the upper face of the blade and on the face of the upstream stud end of the lower pass. A section of the propeller in the connection area is measured perpendicularly to the leading edge of the theoretical profile, and extends towards the stud. Pointed line P2 is located in upstream of the blade with respect to the direction of the fluid flow in the connection area and in the extension of the leading edge of the propeller on the skeleton, and forms an angle of lower than 90[deg] with end face of the blade. The curvature of the connection area in a perpendicular plane that is cut at the leading edge of the theoretical profile depends on the curvature of the theoretical leading edge BAV and the distance separating the point P2 from the theoretical leading edge of the blade in the cut plane. The radius of curvature of point of the line P2 is equal to radius of curvature corresponding to the theoretical profile BAV, and is more than one-third of the distance. The surface of the connection area at point P1 is tangential along its upper surface end of the blade. The surface of the connection area in P3 is tangential along its lower surface end of the blade. A surface of the connection area has a profile C1 between the pointed line P2 and the pointed line P1. The upper surface of the blade is changed by geometrical transformations such as rotation, proportional transformation and/or affinity. The center of gravity of the connecting area defined by the surface located in upstream of the points P1 and P3 with respect to the direction of fluid flow, is on the axis of the smallest inertia of the theoretical profile surface, and close to the center of gravity of the theoretical profile surface.

Abstract (fr)

L' aube de turbomachine monocristalline conforme à l'invention réalisée de fonderie en solidification dirigée, comprenant : une pale (11) avec une bord d'attaque (BA), une face intrados (FI), une face extrados (FE), un bord de fuite (BF), un squelette (S) et d'axe longitudinal (ZZ), les faces (FI) et (FE) présentant une ligne de col, respectivement col d'intrados (CI) et col d'extrados (CE) par rapport à l'aube adjacente dans la roue de turbomachine dont elle constitue un élément, une pièce d'extrémité (20) de la pale, telle qu'un talon ou une plateforme, présentant une face d'extrémité de pale (21), côté veine, formant un angle avec l'axe ZZ et une zone de raccordement (11 E) entre la pale (11) et ladite face d'extrémité de pale, ladite zone de raccordement formant un engraissement de la pale, est caractérisée par le fait que ladite zone de raccordement (11E) s'étend autour du bord d'attaque (BA) entre un point P1 situé sur l'extrados (FE) de la pale en amont du col d'extrados (CE) et un point P3 situé sur l'intrados (FI) de la pale en amont du col d'intrados (CI).

IPC 8 full level

F01D 5/14 (2006.01); B22D 27/04 (2006.01); B23P 15/02 (2006.01); C30B 29/00 (2006.01); F01D 9/04 (2006.01)

CPC (source: EP US)

B22D 27/045 (2013.01 - EP US); F01D 5/141 (2013.01 - EP US); F01D 5/147 (2013.01 - EP US); F05D 2240/121 (2013.01 - EP US); F05D 2240/303 (2013.01 - EP US); F05D 2300/607 (2013.01 - EP US)

Citation (applicant)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

Designated extension state (EPC)

AL BA MK RS

DOCDB simple family (publication)

EP 2071125 A1 20090617; EP 2071125 B1 20110413; CA 2647154 A1 20090614; CA 2647154 C 20151124; DE 602008006153 D1 20110526; FR 2924958 A1 20090619; FR 2924958 B1 20120824; JP 2009144722 A 20090702; JP 5462477 B2 20140402; RU 2008149419 A 20100620; RU 2498082 C2 20131110; US 2009155085 A1 20090618; US 8128375 B2 20120306

DOCDB simple family (application)

EP 08171584 A 20081212; CA 2647154 A 20081211; DE 602008006153 T 20081212; FR 0708751 A 20071214; JP 2008316502 A 20081212; RU 2008149419 A 20081215; US 33396908 A 20081212