摘要
【目的】避免山丘区自压输水管道因水锤而遭受破坏,保障管道的安全运行。【方法】针对山丘区地势起伏的自压输水管道中水锤现象正负压较大的特点,以陕西省千阳县一自压输水管道工程为例,依据水锤基本计算理论,采用倾斜直管和拟合等效短直管相结合的数值模拟方法,分别模拟各个驼峰断面设置进排气阀和末端控制阀门断面前设置超压泄压阀的防护效果,对计算模拟结果进行分析,确定水锤防护措施及具体位置。【结果】在无水锤防护措施的情况下,管道末端控制阀门快速关闭时管道内沿管线产生明显负压,最大负压水头达到-20.06 m,管道末端控制阀门断面处正压最大,正压水头达到87.58 m;合理设置水锤防护措施后,管线全程无负压,全程正压最大水头为70.88 m,未超过管道允许的最大压力。【结论】对于山丘区自压输水管道,采用进排气阀和超压泄压阀联合防护水锤的方法,可以有效缓解水锤现象的发生,保证管道内的压力在设计压力允许范围内。
【Background and Objective】Gravity-driven pipelines have low impact on geological environment,low leakage,simple construction and low operation cost.They have been widely used in irrigation and water supply projects.When the end valve is suddenly turn off under unpredicted circumstances,however,it could result in water hammer and pressure vibration in the pipelines,threating safe operation of the system.Considering water hammer is more likely to occur in long-distance gravity flow pipeline in hilly areas,this paper explore efficacy of different methods to ameliorate the damaging effect of water hammer on gravity flow pipeline in hilly areas.【Method】The study is based on the gravity pipeline project in Qianyang County,Shaanxi province.Numerical simulation combined with inclined straight pipes and fitted equivalent short straight pipe is used to simulate the protective effect of setting inlet and exhaust valve in each hump section and an overpressure relief valve in the front of the end control valve section.We analyzed the simulation results to determine the effect of these methods in alleviating water hammer at specific locations in the pipelines.【Result】Without the water hammer protection measure,when the control valve at the end of the pipeline is turn off quickly,there is no noticeable negative pressure along the pipeline;the maximum negative pressure head reaches-20.06 m,and the maximum positive pressure at the section of the control valve at the end of the pipeline reaches 87.58 m.Installation of the water hammer protection measures eliminates the occurrence of negative pressure in the pipeline and reduces the maximum positive pressure head in the pipeline to 70.88 m,which is lower than the critical pressure for occurrence of water hammer in the pipelines.【Conclusion】For the gravity-driven water transmission pipeline in hilly areas,combination of inlet and exhaust valve and an over-pressure relief valve can effectively alleviate the occurrence of water hammer and ensure that the pressure in th
作者
石晓悟
何武全
田雨丰
李千禧
SHI Xiaowu;HE Wuquan;TIAN Yufeng;LI Qianxi(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,Yangling 712100,China)
出处
《灌溉排水学报》
CAS
CSCD
北大核心
2023年第9期138-144,共7页
Journal of Irrigation and Drainage
基金
国家重点研发计划课题(2022YFD1900402)。
关键词
山丘区
自压管道输水
水锤防护
数值模拟
进排气阀
超压泄压阀
hilly area
gravity flow pipeline water conveyance
water hammer protection
numerical simulation
inlet and exhaust valve
over-pressure relief valve
