A Theory for Boundary Layer Growth on the Blades of a Radial Impeller Including Endwall Influence

[+] Author and Article Information
H. Ekerol, J. W. Railly

Department of Mechanical Engineering, University of Birmingham, Birmingham B15 2IT, England

J. Eng. Power 105(3), 403-411 (Jul 01, 1983) (9 pages) doi:10.1115/1.3227429 History: Received December 07, 1981; Online September 28, 2009


Experimental data on the wall shear stress of a turbulent boundary layer on the suction side of a blade in a two-dimensional radial impeller is compared with the predictions of a theory which takes account of rotation and curvature effects as well as the three-dimensional influence of the endwall boundary layers. The latter influence is assumed to arise mainly from mainstream distortion due to secondary flows created by the endwall boundary layers, and it appears as an extra term in the momentum integral equation of the blade boundary layer which has allowance, also for the Coriolis effect; an appropriate form of the Head entrainment equation is derived to obtain a solution and a comparison made. A comparison of the above theory with the Patankar-Spalding prediction method, modified to include the effects of Coriolis (including mixing length modification, MLM), is also made.

Copyright © 1983 by ASME
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