Radial Vaneless Diffusers: A Re-Examination of the Theories of Dean and Senoo and of Johnston and Dean

[+] Author and Article Information
M. Inoue

Komatsu Ltd., Hiratsuka, Kanagawa, Japan

J. Fluids Eng 105(1), 21-27 (Mar 01, 1983) (7 pages) doi:10.1115/1.3240935 History: Received May 26, 1978; Online October 26, 2009


There are two different but well known theories for calculating loss in the mixing process of the nonuniform flow discharged from the impeller, into the vaneless diffuser. One is by Dean and Senoo, the other by Johnston and Dean. In this paper explanations are given why these two very different theories predict similar total pressure losses. The mixing process in the vaneless diffuser based on the Dean and Senoo theory is re-examined. It is found that the reversible work exchange makes a significant contribution to the non-uniform flow becoming axisymmetric. This process is, however, greatly accelerated by wall friction and interface shear forces between the jet and wake, which lead to loss in total pressure.

Copyright © 1983 by ASME
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