Split flow turbine nozzle

F - Mech Eng,Light,Heat,Weapons – 02 – C

Patent

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Details

F02C 7/18 (2006.01) F01D 5/08 (2006.01) F01D 5/18 (2006.01) F01D 9/06 (2006.01) F01D 25/12 (2006.01)

Patent

CA 2485179

A turbine nozzle (32) includes a hollow vane (38) having opposite pressure and suction sides (54,56) extending in span between outer and inner bands (40,42). The vane includes a forward flow channel (62) behind the leading edge (58), an aft flow channel (64) in front of the trailing edge (60), and a middle flow channel (66) disposed therebetween. The three flow channels are disposed in flow communication with an outer plenum (44) outside the outer band (40) for receiving cooling air therefrom. The forward and middle channels (62,66) are also disposed in flow communication with an inner plenum (48) below the inner band (42) for discharging the air. The aft channel (64) discharges air through the inner band outside the inner plenum (48) in split flow at different pressures.

Tuyère (32) à aubes creuses (38) comprenant des côtés refoulement et aspiration opposés (54, 56) qui s'étendent entre des bandes intérieure et extérieure (40, 42). Les aubes comprennent un canal d'écoulement avant (62) derrière le bord d'attaque (58), un canal d'écoulement arrière (64) devant le bord de fuite (60) et un canal d'écoulement intermédiaire (66) entre les deux autres canaux. Les trois canaux d'écoulement sont en communication fluidique avec un plénum (44) se trouvant à l'extérieur de la bande extérieure (40), pour accueillir l'air de refroidissement. Les canaux avant et intermédiaire (62, 66) sont aussi en communication fluidique avec un plénum intérieur (48) se trouvant sous la bande intérieure (42), pour évacuer l'air. Le canal arrière (64) évacue l'air à travers la bande intérieure hors du plénum intérieur (48) en un écoulement divisé de différentes pressions.

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