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Impact of wall roughness on cavitating process in centrifugal pump |
XU Weihui1, HOU Xiao1*, HU Meng2, HE Xiaoke1, WANG Weishu1 |
1.Thermal Engineering Research Center, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2.China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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Abstract To study the effect of wall roughness on cavitating process in centrifugal pumps, the steady internal flow in a centrifugal pump was simulated numerically by using ANSYS CFX. The fluid domains of the pump were generated by using Pro/E software. The RNG k-ε turbulence model and Zwart′s cavitation model,which doesn′t consider non-condensable gas in water, were applied in simulations. The numerical simulations of flow in the pump were conducted under design flow condition. Then the influences of wall roughness on cavitation characteristic and internal flow pattern were analyzed by changing the wall roughness of the blades. The results showed that an increased roughness led to a decline in the pump head and efficiency but an increase in the shaft power.The degree of influence of roughness on the pump performance in the critical and local cavitation states is more significant than that in the subcritical and supercritical cavitation conditions. The effect of roughness on turbulent kinetic energy in the pump is similar to the influence on the development of cavitation.A reduced wall roughness has a significant effect on the improvement of centrifugal pump characteristics, when the inlet pressure is 81.06 kPa and 101.33 kPa.
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Received: 05 January 2017
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