To investigate the performance of engine cooling water pump in automobile with variable rotating speed, experimental tests and numerical simulation are carried out on an engine cooling water pump under the rotating speed of 2650, 2960, 3700, and 4300 r/min. The hydraulic performance under 3700 r/min rotating speed and the cavitation performance under 340 L/min flow rate are tested and analyzed. The predicted results agree well with the experimental results, indicating that the simulation has high accuracy. The results show that the head of engine cooling water pump increases gradually and the best-effective region moves toward high flow rate condition with the increase in rotating speed. The augment of rotating speed would deteriorate the internal flow fields and causes more energy losses, which is due to the increase in tip leakage flow and enhancement of rotor–stator interaction effects. And, the rotor–stator interaction effect is sensitive to the temperature under various rotating speeds. Furthermore, the required net positive suction head increases with the increase in rotational speed and anti-cavitation performance is weakened during cavitation conditions.

为研究汽车变转速发动机冷却水泵的性能，对某发动机冷却水泵在2650、2960、3700、4300 r/min转速下进行了实验测试和数值模拟。对3700 r/min转速下的水力性能和340 L/min流量下的空化性能进行了测试和分析。预测结果与实验结果吻合较好，表明模拟具有较高的精度。结果表明，随着转速的增加，发动机冷却水泵的扬程逐渐增大，最佳效果区向大流量工况移动。转速的增加会恶化内部流场并导致更多的能量损失，这是由于叶尖泄漏流的增加和转子-定子相互作用效应的增强所致。并且，转子-定子相互作用效应对不同转速下的温度敏感。此外，所需的净正吸头随着转速的增加而增加，并且在空化工况下抗空蚀性能减弱。