供水管网气液两相流关阀水锤

Water hammer of gas-liquid two-phase flow shutoff valve in pipe network

为对管道内气液两相流时关阀水锤工况进行模拟研究,对给水管网内部气液两相同流的流态进行简化后采用自编C++语言水锤分析软件,以安徽省某县经开区给水工程树状管网为例,先建立末端关阀水锤的水锤计算模型,再对不同组合的末端关阀水锤进行模拟和分析计算.计算结果表明,气液两相流时,若给水管道产生末端关阀水锤,则水锤波会向临近的主干管及其他连接的支干管扩散.管网末端阀门全关的极端不利工况时,相较于不含气,含气率为10%的工况导致的末端关阀水锤振幅更大;含气率为10%的极端不利工况时,相较于部分关阀,管网末端阀门同时全关所产生的关阀水锤振幅更大,其关阀水锤的升压超过4.5倍的稳态压力,因此末端关阀水锤对给水工程危害极大.“无频动消锤控流控位阀+箱式双向调压塔+普通排气阀+恒速缓冲排气阀”的水锤防护措施对末端关阀水锤预防效果良好.

For simulation study on pipeline gas-liquid two-phase flow valve water hammer,after simplifying the internal gas-liquid two-phase flow pattern of the water supply network,the C++language water hammer analysis software was used to analyze the tree pipe network in Lu′an,Anhui province,and the end valve closing water hammer calculation model was first established,then the end of valve water hammers of different combinations were simulated and calculated.The calculation results show that if the water hammer produces the end valve closing hammer in the water supply pipe,the water hammer wave will spread to the adjacent main pipe and other connected trunk pipes.When the valve of the pipe network is closed,the pressure of the valve water hammer is more than 4.5 times,so the valve water hammer is extremely harmful to the water supply works.The water hammer protection measure of″frequency-frequency hammer control flow control valve+box two-way pressure regulating valve+ordinary exhaust valve+constant speed buffer exhaust valve″is proposed,and its prevention effect on the end valve closing water hammer is excellent.