Tip Clearance Effect on Heat Transfer and Leakage Flows on the Shroud-Wall Surface in an Axial Flow Turbine

[+] Author and Article Information
M. Kumada, S. Iwata

Department of Mechanical Engineering, Gifu University, Yanagido, Gifu, Japan 501–11

M. Obata

Heat & Fluids Department, Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd., Toyosu, Koto-ku, Tokyo, Japan 135

O. Watanabe

Toyo Denki Co., Ltd., 2-156 Ajiyoshi-cho, Kasugai-city, Aichi-pref, Japan 486

J. Turbomach 116(1), 39-45 (Jan 01, 1994) (7 pages) doi:10.1115/1.2928276 History: Received February 17, 1992; Online June 09, 2008


An axial flow turbine for a turbocharger is used as a test turbine, and the local heat transfer coefficient on the surface of the shroud is measured under uniform heat flux conditions. The nature of the tip clearance flow on the shroud surface and a flow pattern in the downstream region of the rotor blades are studied, and measurements are obtained by using a hot-wire anemometer in combination with a periodic multisampling and an ensemble-averaging technique. Data are obtained under on-and off-design conditions. The effects of inlet flow angle, rotational speed, and tip clearance on the local heat transfer coefficient are elucidated. The mean heat transfer coefficient is correlated with the tip clearance, and the mean velocity is calculated by the velocity triangle method for approximation. A leakage flow region exists in the downstream direction beyond the middle of the wall surface opposite the rotor blade, and a leakage vortex is recognized at the suction side near the trailing edge.

Copyright © 1994 by The American Society of Mechanical Engineers
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