城市供水管网事故时的水力分析

就城市供水管网事故抢修时的阀门关闭优化方案编写程序 ,对分析结果进行模拟显示。由于阀门关闭 ,使部分区域的压力降低 ,影响用户用水 ,导致实际的事故影响区域大于阀门关闭所造成的停水区域。为此 ,改进水力计算方法 ,在牛顿 -拉夫森迭代中考虑事故时节点流量随节点压力的动态变化 ,求解管网压力和实际节点配水量 ,为管网事故时调度提供决策依据

Hydraulic analysis of water network system in case of emergency

The program reflecting the optimal procedure of valve closing in case of emergency has been compiled. As some valves have to be shut down, the pressure of certain regions becomes lower and could not meet the requirements of users. It makes that the influencing area is larger than the area without water. For users in the influencing area the amount of actual distributed water is smaller than that of demand water. Therefore, the improved method is put forward. During the process of Newton-Raphson iteration, the pressure and the amount of distributed water of nodes are solved with the dynamic relationship between the node pressure and the node flow. It is helpful to make decisions of optimal controlling pumps and valves in the case of emergency.