Detailed Stress Tensor Measurements in a Centrifugal Compressor Vaneless Diffuser

[+] Author and Article Information
A. Pinarbasi, M. W. Johnson

Department of Mechanical Engineering, University of Liverpool, Liverpool, United Kingdom

J. Turbomach 118(2), 394-399 (Apr 01, 1996) (6 pages) doi:10.1115/1.2836654 History: Received February 15, 1995; Online January 29, 2008


Detailed flow measurements have been made in the vaneless diffuser of a large low-speed centrifugal compressor using hot-wire anemometry. The three time mean velocity components and full stress tensor distributions have been determined on eight measurement planes within the diffuser. High levels of Reynolds stress result in the rapid mixing out of the blade wake. Although high levels of turbulent kinetic energy are found in the passage wake, they are not associated with strong Reynolds stresses and hence the passage wake mixes out only slowly. Low-frequency meandering of the wake position is therefore likely to be responsible for the high kinetic energy levels. The anisotropic nature of the turbulence suggests that Reynolds stress turbulence models are required for CFD modeling of diffuser flows.

Copyright © 1996 by The American Society of Mechanical Engineers
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