Endwall Flow/Loss Mechanisms in a Linear Turbine Cascade With Blade Tip Clearance

[+] Author and Article Information
A. Yamamoto

National Aerospace Laboratory, Chofu, Tokyo, Japan

J. Turbomach 111(3), 264-275 (Jul 01, 1989) (12 pages) doi:10.1115/1.3262265 History: Received September 01, 1987; Online November 09, 2009


This paper discusses the mechanisms of three-dimensional flows and of the associated losses occurring near the tip endwall region of a linear turbine cascade with tip clearance. The clearance gap sizes and the cascade incidences were chosen as the most important variables affecting the mechanisms. Flows close to the endwall and inside the clearance were surveyed in great detail using a micro five-hole pitot tube of 0.6 mm head size. The results gave very detailed information on the mechanisms, such as leakage flow vectors and pressure distributions throughout the clearance. Interaction of leakage flow with the endwall flow and their associated separation lines, effects of gap size and inlet flow angle on loss generation, and skewness of the three-dimensional endwall flows are also discussed.

Copyright © 1989 by ASME
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