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中文摘要：
通过改变蜗壳基圆直径改变叶轮与隔舌之间的间隙,采用SST模型对3个蜗壳基圆直径的离心泵全流道进行非定常数值模拟。3个蜗壳基圆直径分别为184、198和214 mm,其对应的间隙率为5.74%、13.79%和22.99%。通过非定常数值模拟获得了不同基圆直径离心泵的压力脉动特性、作用在叶轮上的径向力和扭矩特性,并对其进行比较分析。结果表明：不同测点的压力脉动、作用在叶轮上的径向力和扭矩呈周期波动,均以叶片通过频率为主;不同基圆直径泵叶轮上的径向力矢量图基本呈圆形分布;随着蜗壳基圆直径的增大,叶轮上的径向力先减小后增大,各测点压力脉动幅值逐渐减小,高频脉动也逐渐减少。同时针对蜗壳基圆直径为184 mm的泵进行数值模拟,并对该泵进行了性能试验,对比分析结果表明：数值模拟的结果是可信的。
英文摘要：
The three-dimensional unsteady numerical method was applied to simulate the flow in the centrifugal pump with different volute casings by using shear stress transport turbulent model（SST）.The base circle diameters of three volute casings were 184 mm,198 mm and 214 mm with the same impeller,and the radial gaps between the impeller and tongue were 5.74%,13.79% and 22.99% of the impeller radius,respectively.Different characters of the pressure fluctuation,radial hydraulic force and torque on the impeller were obtained with different gaps concerning the rotor-stator interaction.The analysis results indicated that the blade passing frequency dominated the pressure fluctuation,radial hydraulic force and torque on the impeller,of which fluctuations were periodic.The distributions of the radial hydraulic force vector coordinates were presented almost in circles with different gaps.The radial hydraulic force decreased at first then increased with the increasing volute base circle diameters.The amplitude of the pressure fluctuation on the detecting points decreased when the gaps between the impeller and the tongue became larger,and its high-frequency components were also fewer.The simulations were also presented on the characteristics of the radial hydraulic force and the tongue on the impeller of which volute base circle diameters was 184 mm at the different flow rates.For the centrifugal pump with 184 mm volute base circle diameters,its performance experiments and numeric simulations were done.It is found that the calculated results agree well with the measured results.
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