摘要
针对长距离重力流高起伏输水系统因末端阀门关闭引起的关阀水锤问题,以新疆某重力流输水工程为例,通过数值模拟方法研究了无防护措施下的关阀规律以及布置空气罐后其参数对水锤压力的影响,并通过正交试验和极差分析的方法对比了空气罐的连通管直径、体积、水体体积占比三因素对最大压力水头的影响程度.结果表明:在不采取防护措施时,两阶段关阀优于线性关阀,其中快关时间占总关时间的30%,快关角度85%,为最优关阀方式,在总关时间为100,200 s时,两阶段关阀比线性关阀下最大压力水头分别降低35.7%,38.4%,但是全线负压严重;空气罐降低最大压力水头的影响因素顺序由大到小为连通管直径、空气罐体积、水体占比,选取最优空气罐参数后最大压力水头减小了31.6%,最小压力水头升高了91.0%,满足了防护标准.
Aiming at the problem of valve closing water hammer caused by the closing of the end valve in the long-distance gravity flow high-fluctuation water conveyance system,a gravity flow water conveyance project in Xinjiang was taken as an example.The valve closing law without protective measures and the influence of its parameters on the water hammer pressure after the arrangement of the air tank were studied by numerical simulation method.The influence of the diameter,volume and water volume ratio of the air tank connecting pipe on the maximum pressure head were compared through orthogonal experiment and range analysis.The results show that when no protective measures are taken,the two-stage valve closing is better than the linear valve closing.The fast-closing time accounts for 30%of the total closing time and the fast closing angle is 85%,so the two-stage valve closing is the optimal valve closing method.When the total closing time is 100 s and 200 s,the maximum pressure head under the two-stage valve closing is 35.7%and 38.3%lower than that under the linear valve closing,respectively,but the negative pressure in the whole line is serious.The order of the influencing factors of redu-cing the maximum pressure head of the air tank from high to low is as follows:the diameter of the connecting pipe,the volume of the air tank,the proportion of the water volume.After selecting the optimal air tank parameters,the maximum pressure head reduces by 31.6%,and the minimum pressure head increases by 91.0%,which meets the protection standard.
作者
王义淞
张小莹
边少康
WANG Yisong;ZHANG Xiaoying;BIAN Shaokang(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi,Xinjiang 830052,China;Xinjiang Water Conservancy and Hydropower Survey Design Institute Co.,Ltd.,Urumqi,Xinjiang 830099,China)
出处
《排灌机械工程学报》
北大核心
2025年第10期1007-1015,共9页
Journal of Drainage and Irrigation Machinery Engineering
基金
自治区教育厅高校基本科研业务费建设类项目(XJEDU2024J046)
天山英才培养计划青年托举人才项目(2023TSYCQNTJ0014)
中央引导地方科技发展资金项目(ZYYD2024CG20)。
关键词
重力流
水锤
关阀规律
空气罐
参数优化
联合防护
gravity flow
water hammer
valve closing law
air tank
parameter optimization
joint protection
