低比转速离心泵加大流量设计法研

建立了求解低比转速离心泵加大流量设计时计算两个放大系数的约束方程组，数值计算得到了能够在运行点得到最高效率的比转速放大系数和流量放大系数的系列曲线图。进而得到了比转速放大系数与流量放大系数的关系，以及建立在这一关系基础上的叶轮出口宽度计算公式。现有的采用加大流量设计法得到优秀的水力模型大都满足计算得到的结果，一般设计采用的叶轮出口宽度计算的经验公式也与计算结果相吻合。然后以实例对低比转速离心泵加大流量法设计的关键几何参数的选取进行了分析并进行了实验研究。

Research on Enlarged Flow Design for Low Specific-Speed Centrifugal Pump

The constraint equations of two enlargement coefficients in the design of the enlarged flow of low specific-speed centrifugal pump are established and resolved.The numerical calculation can obtain the series charts of the specific speed enlargement coefficient and the enlarged flow coefficient at the highest efficiency of the running points.The relationship between the two coefficients and the calculation formula for the impeller outlet width are also drawn out.The results calculated with the enlarged flow design method agree with the excellent hydraulic model manufactured,and the calculation results also agree with the results of the impeller outlet width of empirical formula.A case study on the selection of key geometrical parameters is analyzed and tested using the enlarged flow design method for low specific-speed centrifugal pump.