SPLIT FLOW TURBINE NOZZLE

摘要

A turbine nozzle (32) includes a hollow vane (38) having opposite pressure a nd 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 fl ow 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 wit h 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.