导流器几何参数对潜水泵性能影响的通径分析

为研究导流器主要几何参数对潜水泵性能的影响规律,根据导流器的工作原理,针对250QJ125型潜水泵,选取导叶片进口安放角、叶片轴向长度、叶片数为试验因素,采用正交试验设计方法设计导流器,应用CFD数值模拟技术,对同一叶轮与不同方案导流器组合的潜水泵进行流场计算与性能预测,运用通径分析法对导流器主要几何参数与潜水泵性能的关系进行分析.结果表明:对取单级扬程和效率作为性能评价指标的潜水泵而言,进口安放角对其性能影响最大,叶片轴向长度次之,叶片数最小;通过相对误差分析,模拟结果与实测结果吻合较好,平均相对误差值为5.1%.利用通径分析能较全面地反映导流器各个参数之间及对潜水泵性能的影响规律,得到影响潜水泵性能的主要因素和次要因素,为从结构设计上提高潜水泵性能提供一定依据.

Path analysis of effects of diffuser geometric parameters on performance of submersible pump

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.