中文摘要：

指出了目前离心泵叶片出口角研究存在的不足。采用FLUENT,在双参考坐标系下,利用有限体积法对雷诺时均Navier-Stokes方程进行数值离散,选用标准k-ε湍流模型,SI MPLEC方法求解,对一比转速为118的离心泵在不同叶片出口角下的内部流场进行了叶轮和蜗壳的耦合数值模拟和能量性能预测。分析了叶片出口角对离心泵内部流场的影响,指出叶片出口角的改变对叶轮内的射流-尾迹结构影响最为明显。能量性能预测结果表明,随着叶片出口角的改变泵效率存在极值点,结合流场模拟结果分析了泵效率存在极值点的原因。

英文摘要：

The present deficiency about numerical simulation research on impeller outlet angle of centrifugal pumps is pointed out. In the case of different outlet angles, the flow field in a centrifugal pump whose specific speed is 118 is simulated by using commercial software FLUENT. The standard k-ε turbulence model and SIMPLEC algorithm are chosen in FLUENT. The simulation is steady and moving reference frame is used to consider rotor-stator interaction. The flow analysis indicates that impeller outlet angle has an important effect on jet-wake structure in the centrifugal pump. According to the simulation results, the head and efficiency of the model are predicted and the design point calculation results are compared with the experiment results. The predicted energy characteristics show that there is a best impeller outlet angle for centrifugal pumps. The research findings can direct the hydraulic design of centrifugal pumps.