Flow Structure in a Radial Flow Pumping System Using High-Image-Density Particle Image Velocimetry

[+] Author and Article Information
O. Akin, D. Rockwell

Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory, 19 Memorial Drive West, Lehigh University, Bethlehem, PA 18015

J. Fluids Eng 116(3), 538-544 (Sep 01, 1994) (7 pages) doi:10.1115/1.2910310 History: Received October 20, 1992; Revised October 06, 1993; Online May 23, 2008


Use of high-image-density particle image velocimetry (PIV) allows characterization of the instantaneous structure of wake and wake-blade interactions in a simulated rotating machine. The distribution of vorticity over an entire plane within the pumping system is related to the instantaneous pressure source terms in the wake of the impeller. Comparison of instantaneous and ensemble-averaged vorticity contours shows that limited ensemble-averaging can produce a substantial reduction in vorticity levels associated with the instantaneous pressure source terms. When the wake from the impeller interacts with a stationary diffuser blade, the instantaneous processes of flow separation and reattachment can be effectively characterized using combinations of instantaneous streamline patterns and contours of constant vorticity. Moreover, active control of the inflow into the pumping system allows substantial modification of these vorticity distributions.

Copyright © 1994 by The American Society of Mechanical Engineers
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