Prediction of Flow Separation in a Diffuser by a Boundary Layer Calculation

[+] Author and Article Information
Y. Senoo

Research Institute of Industrial Science, Kyushu University, Fukuoka, Japan

M. Nishi

Department of Mechanical Engineering, Kyushu Institute of Technology, Tobata, Kitakyushu, Japan

J. Fluids Eng 99(2), 379-386 (Jun 01, 1977) (8 pages) doi:10.1115/1.3448767 History: Received August 16, 1976; Online October 12, 2010


From a consideration of flow stability, it is shown that the onset of separation in a diffuser depends upon the local blockage factor. Using performance data for two-dimensional diffusers from the literature, the shape factor of the boundary layer at the separation point Hs is related to the blockage factor Bs at that section, and the formula Hs = 1.8+3.75Bs is deduced as the separation-limit relation. It is proved that this separation-limit relation is also applicable to conical diffusers. Furthermore, a simple theory is derived to evaluate the time-mean pressure recovery in the separated region. Using this method, it is possible to predict whether a separation occurs in a diffuser and to evaluate the pressure recovery.

Copyright © 1977 by ASME
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