Westinghouse Electric Corporation

Paul H Davis

William E North

Mark T Kennedy

A gas turbine stationary vane having an airfoil portion and inner and outer shrouds. Five serpentine radially extending cooling air passages are formed in the vane airfoil. The first passage is disposed adjacent the leading edge of the airfoil and the second passage is disposed adjacent the trailing edge. A first portion of the cooling air enters the first passage, from which it flows sequentially to the second, third, fourth and fifth passages. Additional cooling air enters the third passage directly, thereby bypassing the first and second passages and preventing over heating of the cooling air by the time it reaches the fifth passage. A radial tube extends through the second passage and directs cooling air through the airfoil, with essentially no rise in temperature, to an interstage cavity for disc cooling. Fins project into each of the passages and serve to increase the effectiveness and flow rate of the cooling air. The fins in the first and fifth passages are angled so as to direct the cooling air toward the leading and trailing edges, respectively. In addition, the fins in the second through fifth passages are angled to retard flow separation as the cooling air turns 180.degree. from one passage to the next.

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Orlando, FL, United States of America

Paul H Davis