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Influence of impeller and guide vane blade number on pressure fluctuation in mixedflow pump |
ZHANG De-Sheng, SHI Wei-Dong, WANG Chuan, WANG Guo-Tao, ZOU Ping-Ping |
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract To investigate into the pressure fluctuation feature caused from the rotorstator interaction between the impeller and the diffuser in a mixedflow pump, the unsteady flow field in the pump with different numbers of blades in the impeller and the diffuser were numerically simulated based on the standard k-ε turbulence model, SIMPLEC algorithm and sliding mesh model. The pressure fluctuation data were acquired by monitoring fluid pressure at the points located at the impeller and diffuser. The influence of number of blades and blade thickness on the pressure fluctuation was discussed in timedomain. The results show that the number of impeller blades is the main factor causing pressure fluctuation in the whole flow field. The pressure fluctuation amplitudes in the inlet and outlet to the impeller is consistently increased when the number of impeller blades is reduced; while the pressure fluctuation at the impeller outlet and in the diffuser is less affected by the number of guide vanes. Those conclusions will provide a reference for hydraulic design of mixedflow pumps and their stable operations.
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Received: 22 September 2011
Published: 30 March 2012
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