The rotor-stator interaction of a rotating impeller and a stationary volute could cause strong pressure pulsations and generate flow induced noise and vibration in a pump used as a turbine (PAT). Blade number is one of the main geometric parameters of the impeller. In this paper, a numerical investigation of the PAT’s unsteady pressure field with different blade numbers was performed. The accuracy of global performance prediction by computational fluid dynamics (CFD) was first verified through comparison between numerical and experimental results. Unsteady pressure fields of the PAT with different blade numbers were simulated, and the pulsations were extracted at various locations covering the PAT’s three main hydraulic parts. A detailed analysis of the unsteady pressure field distributions within the PAT’s control volume and comparison of unsteady pressure difference caused by the increase of blade number were performed. The transient flow results provided the unsteady pressure distribution within PAT and showed that increasing the blade number could effectively reduce the amplitude of pressure pulsations. Finally, unsteady pressure field tests were performed and some unsteady results obtained by unsteady field analysis were validated.
Influence of Blade Number on the Performance and Pressure Pulsations in a Pump Used as a Turbine
Research Center of Fluid Machinery Engineering and Technology,
Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received October 29, 2011; final manuscript received September 10, 2012; published online November 20, 2012. Assoc. Editor: Bart van Esch.
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Yang, S., Kong, F., Qu, X., and Jiang, W. (November 20, 2012). "Influence of Blade Number on the Performance and Pressure Pulsations in a Pump Used as a Turbine." ASME. J. Fluids Eng. December 2012; 134(12): 124503. https://doi.org/10.1115/1.4007810
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