长距离重力流输水系统水锤模拟及其防护研究
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摘要
针对长距离重力流输水系统中的水锤防护问题,以山西省乡宁县县城重力流供水工程为背景,依据水锤计算的基本原理,建立水锤计算模型、末端调流调压阀边界条件及超压泄压阀边界条件,通过数值模拟计算,提出了重力流输水条件下的水锤防护新思路。根据输水管线的稳态运行情况,首先确定了输水管线在末端调流调压阀不同线性关闭方式下的水锤压力变化规律,得出阀门最优关闭时间为1 200s;其次,经优化计算,使用24个空气阀与2台超压泄压阀联合防护,可以确保工程安全运行。研究成果可为重力流工程设计提供参考。
Aiming at the problem of water hammer protection in long distance gravity flow water conveyance system,based on the gravity flow water supply project in Xiangning County,Shanxi Province,according to the basic principle of water hammer calculation,the water hammer calculation model,the boundary condition of the end regulating pressure regulating valve and the boundary condition of the overpressure pressure relief valve are set up.Under the gravity flow water transport conditions,new ideas of water hammer protection under is put forward through numerical simulation calculation.According to the steady state operation of water pipeline,the change law of water hammer pressure in the different linear closing mode of the terminal regulating pressure valve is first determined,and the optimal closing time of the valve is 1 200 s.Secondly,through optimization calculation,combined 24 air valves with 2 overpressure relief valves are used to ensure the safety of the project.The research results can provide reference for gravity flow engineering design.
Aiming at the problem of water hammer protection in long distance gravity flow water conveyance system,based on the gravity flow water supply project in Xiangning County,Shanxi Province,according to the basic principle of water hammer calculation,the water hammer calculation model,the boundary condition of the end regulating pressure regulating valve and the boundary condition of the overpressure pressure relief valve are set up.Under the gravity flow water transport conditions,new ideas of water hammer protection under is put forward through numerical simulation calculation.According to the steady state operation of water pipeline,the change law of water hammer pressure in the different linear closing mode of the terminal regulating pressure valve is first determined,and the optimal closing time of the valve is 1 200 s.Secondly,through optimization calculation,combined 24 air valves with 2 overpressure relief valves are used to ensure the safety of the project.The research results can provide reference for gravity flow engineering design.
引文
[1]朱晓憬.长距离大型区域重力流输水系统水锤防护计算研究[D].西安:长安大学,2009.
[2]沈金娟.长距离输水管道进排气阀的合理选型及防护效果研究[D].太原:太原理工大学,2013.
[3]金锥,姜乃昌,汪兴华,等.停泵水锤及其防护(第二版)[M].北京:中国建筑工业出版社,2004.
[4]欧楠.长距离输水工程重力流水锤阀防护的数值模拟[D].太原:太原理工大学,2010.
[5] E B Wylie,V L Streeter.Fluid Transients[M].New York:Mcgraw-Hill International Book Company,1978.
[6] CECS193-2005,城镇供水长距离输水管(渠)道工程技术规程[S].北京:中国计划出版社,2006.
[2]沈金娟.长距离输水管道进排气阀的合理选型及防护效果研究[D].太原:太原理工大学,2013.
[3]金锥,姜乃昌,汪兴华,等.停泵水锤及其防护(第二版)[M].北京:中国建筑工业出版社,2004.
[4]欧楠.长距离输水工程重力流水锤阀防护的数值模拟[D].太原:太原理工大学,2010.
[5] E B Wylie,V L Streeter.Fluid Transients[M].New York:Mcgraw-Hill International Book Company,1978.
[6] CECS193-2005,城镇供水长距离输水管(渠)道工程技术规程[S].北京:中国计划出版社,2006.