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中文摘要：
运用Fluent流场计算软件，采用修正的RNGk—s湍流模型、滑移网格技术和二阶隐式时间推进法，用SIMPLEC算法对压力和速度耦合求解，数值模拟了低比转数变曲率叶型离心泵定常压力场、速度场和非定常压力场，设定了不同工况下靠近隔舌区叶轮和蜗壳之间的3个监测点，得到了3点的均压脉动度，并将计算的外特性曲线与试验进行了比对。结果表明，短叶片抑制了工作面流动的分离，改善了叶片上压力分布，叶轮出口处的射流尾迹区得到了明显改善；隔舌附近监测点的压力脉动幅值与监测点到隔舌间的距离成正比；数值计算结果为该泵叶型设计提供了理论依据。
英文摘要：
The unsteady flow of the low specific speed centrifugal pump with curvature blade was simulated numerically by software Fluent, RNG k - e turbulence model and sliding mesh technology. Three indicator points near tongue with impeller and volute were monitored and pressure fluctuation of those points was gotten. Then, the calculating values were compared with test values. The results show that splitter blades restrain the flow separation. The performance of the pump, the pressure distributions of the pump and jet-wake region are improved deeply. The pressure pulsation amplitude of the indicator points near the tongue is proportional to the distance between the volute tongue and points.
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