【摘要】 两阶段关闭蝶阀是水锤防护的重要措施之一,为了研究如何合理的确定两阶段关闭蝶阀的关阀程序,应用水锤基本理论和特征线法,结合某实际工程,对长距离有压输水管道系统在八种不同运行工况下的停泵水锤过程进行了计算,分别得到1080组两阶段关闭蝶阀的关阀程序在八种工况下管线的最小水锤压力、泵出口最大压力、倒转转速和超过额定转速的时间。计算结果表明:全部水泵停泵并不是最不利工况;不同工况下,两阶段关闭蝶阀的最优关阀程序不同,两阶段关闭蝶阀关阀程序的可行域不同且差异较大。通过对计算结果的对比分析,提出两阶段关闭蝶阀关阀程序合理的确定方法,该方法对同类工程在确定关阀程序时具有参考意义。更多还原

【Abstract】 Two-stage closing butterfly valve is one of the important measures of water hammer protection. In order to determine reasonable close program of two-stage closing butterfly valve, calculations are carried out for the pump-stopping water hammer process of a long pressurized pipeline system in eight different operating conditions based on the basic theory of water hammer and the method of characteristics. Specifically, the parameters, including the minimum water hammer pressure of pipeline, maximum pressure of pump outlet, reverse speed, and time of exceeding the rated speed, which are obtained from 1080 sets of close programs of two-stage closing butterfly valve under the eight different operating conditions. The results show that all the pump stopping is not the most disadvantageous operating condition. The optimal close programs of two-stage closing butterfly are different under different operating conditions, and significant differences of the feasible region of close programs of two-stage closing butterfly valve were also observed. Through a comparative analysis, this study proposes a reasonable way to determine the close program of two-stage closing butterfly valve. The method serves as a reference for the determination of close program of valve in similar projects.更多还原