Allison Advanced Development Company

Jeffrey Lister Hansen

Robert Anthony Ress, Jr

Edward Claude Rice

A compression system endwall bleed system having a plurality of bleed slots formed in a mechanical housing downstream of a rotating shrouded rotor. In one embodiment, the plurality of bleed slots bleed off a separated tip boundary layer to relieve back pressure associated with this blockage. A sealing structure downstream of the shrouded rotor is utilized to minimize working fluid leakage ahead of the plurality of bleed slots.

Compressor endwall bleed system

A gas turbine engine variable vane having a winglet integrally formed therewith. In one embodiment, the variable vane includes a winglet attached to one end so as to reduce endwall losses resulting from air leakage from the high-pressure side to the low-pressure side of the airfoil. The winglet substantially increases the width of the endwall gap thereby reducing the loss associated with the vortex flow caused by leakage of gas from the pressure side to the section side of the airfoil. In another aspect the winglet runs along the airfoil thereby increasing stiffness and acting as a bracing strut to increase the resonant frequency of the airfoil.

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Indianapolis, IN, United States of America

Jeffrey Lister Hansen