摘要
为降低供水工程中加装压力波动预止阀对系统中负压的恶化程度,在建立了水锤计算数学模型的基础上,应用特征线法对压力波动预止阀的防护效果进行了数值模拟计算,并提出了压力波动预止阀初始开阀时间的延迟优化方案.通过水锤防护计算并比较延迟开阀优化前后系统的负压变化情况,发现压力波动预止阀的装设确实会加大系统的负压,对系统管路造成不利影响;而延迟开阀的优化方案能有效消除和减弱因压力波动预止阀的动作而引起的负压恶化.此研究结果对于装设有压力波动预止阀的供水系统的泵站水锤防护具有重要参考价值和指导意义.
In order to confirm and study the deterioration of negative pressure in the system caused by pressure surge preliminary relief valve,the numerical simulation of pressure surge preliminary relief valve＇s protecting effect is conducted based on the mathematical model of water hammer calculation and the method of characteristic lines. In the meantime,an optimization scheme is brought up for the delay of the initial time when the valve is open. Through the water hammer calculation and by comparing the negative pressure before and after the optimization,it indicates that the installation of pressure surge preliminary relief valve does increase the negative pressure of the system,which will have adverse impact to the piping system. On the other hand,the scheme of delay in opening the valve can effectively eliminate or obviously weaken the deterioration of negative pressure effect caused by installing pressure surge preliminary relief valve. The research has significant guide and important reference value in protecting water supply system from pump-station water hammer with pressure surge preliminary relief valve.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2015年第2期133-137,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51279145)
关键词
压力波动预止阀
优化开阀
防护
停泵水锤
pressure surge preliminary relief valve
opening optimization
protection
pump-stopping water hummer
