Studies on Wake-Affected Heat Transfer Around the Circular Leading Edge of Blunt Body

[+] Author and Article Information
K. Funazaki

Department of Mechanical Engineering, Iwate University, Morioka, Iwate, Japan

J. Turbomach 118(3), 452-460 (Jul 01, 1996) (9 pages) doi:10.1115/1.2836688 History: Received February 04, 1996; Online January 29, 2008


Detailed measurements are performed about time-averaged heat transfer distributions around the leading edge of a blunt body, which is affected by incoming periodic wakes from the upstream moving bars. The blunt body is a test model of a front portion of a turbine blade in gas turbines and consists of a semicircular cylindrical leading edge and a flat plate afterbody. A wide range of the steady and unsteady flow conditions are adopted as for the Reynolds number based on the diameter of the leading edge and the bar-passing Strouhal number. The measured heat transfer distributions indicate that the wakes passing over the leading edge cause a significant increase in heat transfer before the separation and the higher Strouhal number results in higher heat transfer. From this experiment, a correlation for the heat transfer enhancement around the leading edge due to the periodic wakes is deduced as a function of the Stanton number and it is reviewed by comparison with the other experimental works.

Copyright © 1996 by The American Society of Mechanical Engineers
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