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Numerical analysis on influence of guide vanes on performance of centrifugal pump acting as hydraulic turbine |
Yang Junhu, Gong Zhaohui, Xia Shuqiang, Luo Kaikai, Li Hailong |
School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract In order to study the effects of guide vanes on the performance of a centrifugal pump acting as hydraulic turbine, CFD software was adopted to simulate the flow field of the pump as turbine which was designed with and without guide vanes. The results show that guide vanes could improve the efficiency, increase the flow rate at the best efficiency point and decrease the required pressure head. Internal flow field analysis shows that the velocity field is improved, and the number of vortexes as well as the size decreases. The static pressure distributions at the inlet of impeller increases. The analysis of velocity moment distribution shows that the variation amplitude of velocity moment with guide vanes is smaller, and symmetrical distribution and smooth change of velocity moment can be found on the ring surface of impeller inlet. When the number of guide vanes is eleven, the variation amplitude of velocity moment is the lowest. With the guide vanes, the injection conditions of impeller and the operation stability are improved.The results are instructive to the optimization design of pumps as turbines.
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Received: 28 January 2013
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