旁通阀对长距离重力流输水管线水力过渡过程的影响  

Effect of bypass valve on hydraulic transient process in long water transport pipelines with gravity flow

作　　者：白绵绵[1] 王福军[2] 雷澄[1] 王玲[2] 刘帮超 BAI Mianmian;WANG Fujun;LEI Cheng;WANG Ling;LIU Bangchao(Branch of Water Resources,Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,Xi′an,Shaanxi 710001,China;Beijing Engineering Research Center of Safety and Energy,China Agricultural University,Beijing 100083,China)

机构地区：[1]陕西省水利电力勘测设计研究院水利分院,陕西西安710001 [2]中国农业大学北京市供水管网系统安全与节能工程技术研究中心,北京100083

出　　处：《排灌机械工程学报》2019年第1期58-62,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51621061);"十二五"国家科技支撑计划项目(2015BAD20B01)

摘　　要：为研究旁通阀在长距离重力流输水管路检修过程中的作用,基于特征线法,建立了旁通阀计算模型.结合某大型重力流输水工程,对设置旁通阀与否的管路水力过渡过程进行了分析.结果表明,不设置旁通阀时,检修阀关闭会引起系统较大升压;设置旁通阀后,系统压力波动明显变缓,最高压力包络线与设计压力线在检修阀下游几乎重合,在检修阀上游稍有升高,相应地,最低压力包络线在检修阀上游与设计压力线稍有下降,在检修阀下游几乎重合.通过调试检修阀与旁通阀的关闭规律可以发现,检修阀关闭时间一定时,旁通阀关闭时间越长,最大压力越小,压力波动越平缓;而旁通阀关闭时间一定时,检修阀关闭时间的变化对压力波动形状影响不大,但会影响压力波动的开始时刻.同时,对不同管段检修工况压力极值统计发现,旁通阀对系统不同位置管段的防护程度不同,对起点和末端管段的压力防护作用最大.In order to study the role of a bypass valve during maintenance process of a long water transport pipelines with gravity flow,a computational model of bypass valve was built based on method of characteristics. In a large water transport pipeline with gravity flow,hydraulic transient processes with and without bypass valve were analyzed. It is found that the maximum pressure head decreases and the minimum pressure head increases in the pipeline with bypass valve compared with the pipeline without bypass valve. When the closure time of service valve is fixed,the longer the closure time of bypass valve,the smaller the maximum pressure head,and the milder the pressure surge. When the closure time of bypass valve is fixed,the closure time of service valve has a little effect on pressure surge but a greater effect on the initial time of pressure surge. Moreover,it is shown that the degree of protection ofthe bypass valve depends on section in the pipeline,and the surge protection is more significant in the starting section and ending section of the pipeline.

关 键 词：重力流 检修阀 旁通阀 过渡过程 

分 类 号：S277.9[农业科学—农业水土工程] TV134.1[农业科学—农业工程]