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International Journal of Rotating Machinery
Volume 10 (2004), Issue 4, Pages 309-317

The Flow Rate Influence on the Interaction of a Radial Pump Impeller and the Diffuser

1Laboratoire de Mécanique des Fluides et d'Acoustique, Composante INSA Lyon, Villeurbanne, France
2Laboratoire de Mécanique des Fluides et d'Acoustique UMR-CNRS 5509, Composante INSA de Lyon, Bât, J. Jacquard 27, Avenue Albert Einstein, Villeurbanne 69621, France

Copyright © 2004 Hindawi Publishing Corporation. 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.


This article presents the results of a detailed flow investigation within a centrifugal pump equipped with a vaned diffuser. The measurements were made with a laser Doppler velocimeter and were carried out at different operating points. The flow was investigated for different rotor–stator relative positions.

Unsteady velocity measurements, obtained in phase with the rotor angular position, gave access to the flow inside the impeller channels where three sections were explored. In the diffuser, five sections were studied. Thus, time resolved details of the flow were examined for a better understanding of the complex unsteady flow existing between the two interacting blade rows.

Results obtained at different operating conditions show that the rotor-stator interaction is affected by the diffuser position and the flow rate.