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RESEARCH PAPERS

Separated Flow in a Low-Speed Two-Dimensional Cascade: Part II—Cascade Performance

[+] Author and Article Information
A. M. Yocum

Applied Research Laboratory, Pennsylvania State University, State College, PA 16804

W. F. O’Brien

Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

J. Turbomach 115(3), 421-434 (Jul 01, 1993) (14 pages) doi:10.1115/1.2929269 History: Received March 05, 1992; Online June 09, 2008

Abstract

This study was conducted for the purpose of providing a more fundamental understanding of separated flow in cascades and to provide performance data for fully stalled blade rows. Cascades of a single blade geometry and a solidity of unity were studied for three stagger angles and the full range of angle of attack extending well into the stalled flow regime. The Reynolds number was also varied for a limited number of cases. Results from velocity and pressure measurements made in the cascade and the overall cascade performance evaluated from these measurements are presented. In addition, results from a numerical simulation of the flow through a cascade of flat plate airfoils are used to illustrate further the effects of blade stagger and to define the correct limits for the cascade performance. The results indicate that the slope of the total pressure loss versus angle of attack curve for the flow immediately downstream of the cascade is steeper for cascades with greater stagger. The normal force coefficient was found to increase to a peak value near the angle of attack where full leading edge stall first occurs. A further increase in angle of attack results in a decline in the normal force coefficient. The peak value of the normal force coefficient is greater and occurs at a higher angle of attack for the cascades with smaller stagger.

Copyright © 1993 by The American Society of Mechanical Engineers
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