(19)
(11) EP 1 262 631 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
21.02.2007 Bulletin 2007/08

(88) Date of publication A3:
26.05.2004 Bulletin 2004/22

(43) Date of publication:
04.12.2002 Bulletin 2002/49

(21) Application number: 02253563.7

(22) Date of filing: 21.05.2002
(51) International Patent Classification (IPC): 
F01D 5/18(1968.09)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.05.2001 US 861753

(71) Applicant: UNITED TECHNOLOGIES CORPORATION
Hartford, CT 06101 (US)

(72) Inventors:
  • Kohli, Atul
    Tolland, CT 06084 (US)
  • Wagner, Joel H.
    Wethersfield, CT 06109 (US)
  • Aggarwala, Andrew S.
    East Hartford, CT 06118 (US)

(74) Representative: Leckey, David Herbert 
Frank B. Dehn & Co. St Bride's House 10 Salisbury Square
London EC4Y 8JD
London EC4Y 8JD (GB)

   


(54) Film cooled blade or vane


(57) The invention resides in a film cooled article such as a turbine engine blade or vane, having a wall with a hot surface (26) to be film cooled. The hot surface (26) includes a depression (48) featuring a descending flank (52) and an ascending flank (54). Coolant holes (60), which penetrate through the wall, have discharge openings residing on the ascending flank (54). During operation, the depression locally over-accelerates a primary fluid stream F flowing over the ascending flank while coolant jets (70) concurrently issue from the discharge openings. The local over-acceleration of the primary fluid deflects the jets onto the hot surface and spatially constrains the jets thus encouraging them to spread out laterally and coalesce into a laterally continuous, protective coolant film. In one embodiment, the depression (48) is a trough (50). In another embodiment, the depression is a dimple (72).