摘要
长距离重力流输水管线距离长、支线多、落差大,当突然关闭末端水厂阀门管线时会产生破坏性较大的水锤压力,因此,分析水锤特性并采取合理的水锤防护措施,对于保证输水工程的可靠性和降低管路工程造价具有重要意义。以某输水工程为例,建立输水管路水锤压力数学模型,用于研究末端水厂关阀引起的管路压力和水锤压力变化规律。结果显示,管路末端水厂阀门在无水锤防护措施工况下同时关闭,水锤压力沿线逐渐上升,末端易产生水锤高压。依据数值模拟结果,采用空气阀、超压泄压阀等水锤防护措施,可减小管路末端关阀水锤压力,保障输水系统的安全运行。研究成果可为类似工程的水锤防护提供参考。
Long distance water gravitational transportation pipeline has many tributary lines and large water head dltterence, it can produce seriously destructive water hammer pressures when the water plant valves at the end of pipeline are shut off sud-denly. Therefore, it is very important to analyze the characteristics of water hammer and perform necessary protective measures of water hammer in order to ensure the reliability of water transfer project and reduce the cost of pipeline project. In this paper, a numerical model of water hammer pressure for a water transportation pipeline is built to analyze the variations of pipeline pressure and water hammer pressure with the sudden shutting off of the water plant valves at the end of pipeline. The results showed that when all the water plant valves at the end of pipeline close at the same time without protective measures of water hammer,the water hammer pressure increases gradually along the pipeline, and a high water hammer pressure occurs at the end of pipeline. The simulation results suggested that the application of protective measures of water hammer such as air valves and overpressure relief valves can reduce the valve-closure water hammer pressure at the end of pipeline and ensure the safety of the water transfer system. The research can provide references for similar engineering projects of water hammer protection.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2012年第6期6-9,41,共5页
South-to-North Water Transfers and Water Science & Technology
关键词
重力流
长距离输水管路
水锤压力
关阀水锤
水锤防护措施
特征线法
gravity flow
long distance water transportation pipeline
water hammer pressure
valve-closure water hammer
waterhammer protective measures
MOC
