给水管网水力瞬变分析（2）

继文（１）提出数值方案后，本文完成了计算程序编制，并对典型环状给水管网总管及网间管段阀门关闭的产生的水力瞬变进行了计算分析。结果表明：阀门阀后管段中的关闭水狂较管网其它管段裂大得多；按本文计算所用的阀门特性，水遥压力急剧上升时的阀门开度低于２％，控制好此后的关闭过程对降低水狂有利；延长给水总管阀门关闭时间有利于降低关闭瞬间水锤，本文人有良好的收敛性，可用于实际进行工程问题分析。

Hydraulic Transient Analysis for Water Supply Pipe Networks (2)

Based on the numerical solution scheme suggested by author the computer code has been programmed. Hydraulic transient analyses were performed for a typical ring distribution water supply system under the disturbing caused by the closing valve that is located in water supply main and in branch pipe respectively. The results show that the water hammers caused by the disturbing have much more effect on the pipes near the closing valves than the other pipes in networks.The water hammer is rapidly rising when the opening of valve is approaching about 2 percent in the closing process. In order to lower the water hammer, it is necessary that the valve located in the water supply main be very slowly closed down when the opening of valves is approaching 2 percent. The results also show that the method in this paper has good convergence rate and high numerical precision. It is available for performing transient hydraulic analysis of water supply pipe networks in engineering practice.