Patent ID: 6929446

Claim:
A turbine nozzle comprising: a pair of hollow vanes fixedly joined to outer and inner bands, and each vane including opposite pressure and suction sides extending in span between said bands, and extending in chord between leading and trailing edges; said trailing edge of a first one of said vanes forming with said suction side of a second one of said vanes forward of said trailing edge thereof a throat of minimum flow area between said vanes; each of said vanes further including identical patterns of outlet holes distributed over said pressure and suction sides thereof for discharging cooling air therefrom collectively at a reference flowrate through each vane; said patterns of holes including multiple rows of showerhead holes bridging said leading edge, and two rows of gill holes spaced aft from said showerhead holes along said suction sides of said vanes; a row of auxiliary holes spaced aft from said showerhead holes through said pressure side in each vane; and said gill holes being sized to counterbalance added discharge of said cooling air through said auxiliary holes for maintaining said reference flowrate.