Abstract：In order to study the impellervolute interaction in a doubleblade centrifugal pump, the flow in three sections of impeller passages was measured with nine different locations between a blade and the tongue of volute at the best efficiency point. The relative velocity field and axial velocity field are greatly dependent on the distance between a blade and the tongue. When a blade is between the tongue and the section 1 on volute, the flow rate in that passage is the lowest, and the relative velocity field is uniform. Meanwhile, there is a low velocity zone in the corner between the shroud and the blade suction side at the passage outlet, causing a jetwake flow pattern at the impeller outlet. A higher axial velocity range is observed at the passage inlet. As the blade leaves far away from the tongue due to its rotation, the flow rate in the passage is increased, and flow is separated from the blade pressure side, establishing a vortex there. The relative velocity profile at the passage outlet becomes uniform, and the axial velocity at the passage inlet decreases as well. As the blade gets close to the tongue, the flow rate in the passage is reduced, and the scale of the vortex is decreased and disappears eventually. The relative velocity at the blade pressure side outlet is lowered, but that at the blade suction side is increased, meanwhile the axial velocity at the passage inlet continues decreasing.
刘厚林, 杨东升, 谈明高, 王凯, 庄宿国. 双叶片离心泵内动静干涉的三维PIV测量[J]. 排灌机械工程学报, 2012, 30(4): 384-389.
LIU Hou-Lin, YANG Dong-Sheng, TAN Ming-Gao, WANG Kai, ZHUANG Su-Guo. 3D PIV measurements of rotorstator interactions in doubleblade centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 384-389.
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