排灌机械工程学报2013，Vol.31Issue(5)：406-412,7.DOI:10.3969/j.issn.1674-8530.2013.05.008
枝状管网水力瞬变工况的试验与数值模拟
Experiment and numerical simulation of hydraulic transients in branched pipe network
摘要
Abstract
The water hammer pressure and fluctuation in a branched pipe network were studied by experiment and the method of characteristics (MOC) when the valve is closed.In experiment a pressure sensor was used to monitor water hammer pressure and fluctuation and the angular displacement sensor was adopted to measure the closing time and opening of the valve.The results showed that the MOC can better predict the maximum water hammer pressure caused by valve closing in the network with a relative error of less than 13％.The pressure wave attenuation in simulation is slower than in experiment because the friction factor of steady flow is used in the simulation.Based on that analysis,the transient flows generated by other five closing schemes of valve have been simulated numerically.It was shown that the maximum water hammer pressure was generated in the network when the two valves at the network end were closed simultaneously; suggesting this case should be avoided in applications.The maximum water hammer pressure was reduced with increasing closing time.For a constant closing time,the maximum water hammer pressure generated by a curved line closing scheme or a two-stage straight line closing scheme was lower than that by the one straight line scheme.For the two-stage straight line closing scheme,the closing time of the first stage should properly be extended to reduce the maximum water hammer pressure.关键词
枝状管网/水力瞬变/关闭规律/数值模拟/最大水锤压力Key words
branched pipe network / hydraulic transient/ closing pattern / numerical simulation /maximum water hammer pressure分类
农业科技引用本文复制引用
石喜,吕宏兴,朱德兰,孙斌,曹彪..枝状管网水力瞬变工况的试验与数值模拟[J].排灌机械工程学报,2013,31(5):406-412,7.基金项目
"十二五"国家科技支撑计划项目(2011BA29B00) （2011BA29B00）
国家自然科学基金资助项目(50909083) （50909083）
教育部、国家外专局"111"计划项目(B12007) （B12007）
