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城市给水管网在实际运行中,经常通过泵阀启停实现供水量的改变或事故检修,工况的切换不可避免地引发管内正负压力波动。研究不同管网拓扑结构在无其他防护措施的供水行为(如多阀关闭、泵的启停和消防等工况)下的水锤现象。通过对比分析发现,相对于树状管网,环状管网对关阀产生的高压波、消防工况产生的低压波以及因停泵再启产生的水柱分离有较好的消减作用,但对解决停泵后负压没有帮助,必须与空气阀配合使用。该结论可为城市管网运行以及管网的扩建和改造提供参考。
In the actual operation of urban water supply pipe network, often through the pump valve start and stop to achieve changes in water supply or accident maintenance, the working conditions of the switch inevitably lead to positive and negative pressure fluctuations in the pipe. Study the water hammer phenomenon of different pipe network topologies under the water supply without other protective measures (such as multi-valve closure, pump start-stop and fire fighting). Through comparative analysis, it is found that, compared with the tree pipe network, the ring pipe network has a good reduction effect on the high pressure wave generated by the valve closing, the low pressure wave produced by the fire protection condition, and the water column separation caused by the restart of the pump. After the pump to solve negative pressure does not help, must be used in conjunction with the air valve. This conclusion can provide reference for the operation of urban pipe network and the expansion and renovation of pipe network.