长距离泵输水系统事故停泵水锤数值模拟研究

为了确定输水系统事故停泵水锤的合理防护措施，根据辛安泵站长距离高扬程的工程特点，建立水锤数学模型。通过模拟计算，确定了两阶段阀门的最优关闭规律，并将水泵出口设置两阶段关闭蝶阀、无关闭阀、蝶阀和空气阀联合防护3种不同条件下停泵水锤水力瞬态过程计算结果进行对比分析。结果表明：所建立的数学模型合理，蝶NN空气阀联合防护措施效果明显，为管道和泵站的设计提供依据。

Numerical simulation of water hammer of accident stopped pump in water transmission system of long distance pump

In order to determine reasonable protection measures for the water hammer of accident stopped pumping of water transmission system, according to the engineering characteristics of long - distance and high - lift in pumping station of Xinhn, the paper established water hammer mathematical model of accident stopped pump. It determined the optimal close rule of two stage valve through calcuation, and analyzed the calculation results of stopped pumping water hammer hydraulic transient process were under three different conditions of two stage closing butterfly valve, no shutoff valve and the protection of butterfly valve combined with air valve setted in the outlet of pump. The results showed that the established mathematical model is reasonable and the effect of protection measures of butterfly valve combined with air valve is obvious, witch provide the basis for the design of pipeline and pumping station.