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For water supply systems with high-lift, the pump-stopping water hammer caused by the power failure is usually greater than the direct water hammer caused by the check valve closing. Based on the Joukovsky equation and the pressure drop law behind the pump, the influence of the check valve closing law on the pressure along the pipeline was studied, and the theoretical value of the optimal closing time (i.e., T_g=T_d) was obtained when a pump trip occurred. The theoretical value was verified by numerical simulation through a practical project. The results show that for high-lift water supply projects, the theoretical closing time of the check valve can minimize the pressure drop along the pipeline when the pump trip occurred.

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对于扬程较高的输水系统，水泵抽水断电后产生的停泵水锤通常大于泵后阀门直接关闭产生的直接水锤。基于茹科夫斯基公式及水泵抽水断电的泵后降压规律，研究了泵后阀门关闭规律对输水管道沿线压力的影响，得到了水泵断电后泵后阀门最佳关闭时间的理论值，即T_g=T_d，并结合实际输水工程，采用数值模拟方法对该理论值进行了验证。结果表明，对于高扬程输水工程，水泵抽水断电后，泵后阀门采用提出的理论值可使停泵水锤对输水系统产生的危害最小。

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占桂泉（1979-），男，高级工程师，研究方向为水利水电工程设计技术，E-mail：6266618@qq.com

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占桂泉（1979-），男，高级工程师，研究方向为水利水电工程设计技术，E-mail：6266618@qq.com

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