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| Path analysis of effects of diffuser geometric parameters on performance of submersible pump |
| Wei Qingshun1,2, Sun Xihuan1, Liu Zailun3 |
| 1.College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2.College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China; 3.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract In order to explore effects of diffuser geometric parameters on performance of submersible pump, the diffuser of 250QJ125 submersible pump was redesigned by using an orthogonal experiment design array with various inlet angles, axial lengths and numbers of vanes while the rest geometric parameters of impeller remained unchanged. The flow field of each design was calculated by means of CFD technique and its performance was predicted as well;then the relationships between those parame-ters and the performance were established by employing path analysis. The results show that the vane inlet angle of diffuser affects head and efficiency most significantly, while the number of vanes has a least effect on both performance parameters, the effect of vane axial length is in between. The predicted performance is close to the measurement with a smaller relative error as low as 5.1%. Path analysis not only can identify effects of geometric parameters of diffuser on performance of submersible pump but also can rank the parameters. Nevertheless, this can provide a reference for diffuser hydraulic design to improve performance of a submersible pump.
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Received: 26 August 2012
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