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International Journal of Rotating Machinery
Volume 2009 (2009), Article ID 410838, 10 pages
http://dx.doi.org/10.1155/2009/410838
Research Article

Comparison of Periodic Flow Fields in a Radial Pump among CFD, PIV, and LDV Results

Department of Mechanical Engineering, Faculty of Engineering, University of Duisburg-Essen, 47048 Duisburg, Germany

Received 11 March 2009; Accepted 1 August 2009

Academic Editor: Gerard Bois

Copyright © 2009 Jianjun Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The interaction between the impeller and the diffuser is considered to have a strong influence on the unsteady flow in radial pumps. In this paper, the unsteady flow in a low specific speed radial diffuser pump has been simulated by the CFD code CFX-10. Both Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) measurements have been conducted to validate the CFD results. Both the phase-averaged velocity fields and the turbulence fields obtained from different methods are presented and compared, in order to enhance the understanding of the unsteady flow caused by the relative motion between the rotating impeller and the stationary diffuser. The comparison of the results shows that PIV and LDV give nearly the same phase-averaged velocity fields, but LDV predicts the turbulence much clearer and better than PIV. CFD underestimates the turbulence level in the whole region compared with PIV and LDV but gives the same trend.