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RESEARCH PAPERS

Influence of Endwall Flow on Airfoil Suction Surface Midheight Boundary Layer Development in a Turbine Cascade

[+] Author and Article Information
O. P. Sharma, R. A. Graziani

Pratt & Whitney Aircraft, Commercial Products Division, East Hartford, Conn. 06108

J. Eng. Power 105(1), 147-155 (Jan 01, 1983) (9 pages) doi:10.1115/1.3227376 History: Received December 10, 1981; Online September 28, 2009

Abstract

This paper presents the results of an analysis to assess the influence of cascade passage endwall flow on the airfoil suction surface midheight boundary layer development in a turbine cascade. The effect of the endwall flow is interpreted as the generation of a crossflow and a crossflow velocity gradient in the airfoil boundary layer which results in an extra term in the mass conservation equation. This extra term is shown to infuence the boundary layer development along the midheight of the airfoil suction surface through an increase in the boundary layer thickness and consequently an increase in the midheight losses, and a decrease in the Reynolds shear stress, mixing length, skin friction, and Stanton number. An existing two-dimensional differential boundary layer prediction method, STAN-5, is modified to incorporate the above two effects.

Copyright © 1983 by ASME
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