摘要
【目的】研究城市深层隧洞输水系统的水力过渡过程特性。【方法】以西丽水库至南山水厂原水管工程实例为研究对象,利用Bentley hammer软件建立输水系统模型;分析启泵间隔时间对输水系统稳定性的影响,并进一步分析典型工况下管道糙率对输水系统稳定性的影响;探究增设3#竖井为调压井对输水系统稳定性的影响。【结果】当启泵间隔时间大于240 s时,2#竖井最低瞬态水位趋于稳定;管道糙率越大,启泵工况下最低瞬态水位越低,事故停泵工况下涌浪水位的超调量越大;增设3#竖井作为调压井对输水系统水锤压力极值影响不大。【结论】启泵间隔时间大于240 s时,启泵间隔时间对输水系统稳定性几乎没有影响;管道糙率越大,典型工况下系统稳定性越差;增设3#竖井作为调压井后需投入大量维护成本,且对输水系统水锤压力极值影响不大,故不建议设置为调压井。
【Objective】The purpose of this paper is to study the characteristics of the hydraulic transition process of the urban deep tunnel water delivery system.【Method】First,take specific engineering examples as the research object and use Bentley hammer software to establish a water delivery system model.Then,analyze the influence of the pump start interval on the stability of the water delivery system,and further analyze the influence of the pipeline roughness on the stability of the water delivery system under typical working conditions.Finally,explore the impact of adding 3#shaft as a surge tank on the stability of the water delivery system.【Result】The results showed that when the pumping interval was longer than 240 s,the lowest transient water level of shaft 2#tended to be stable.The greater the roughness of the pipeline,the lower the lowest transient water level under pump-starting conditions,the greater the surge water level overshoot under pump-off conditions.The addition of 3#shaft as a surge tank had little effect on the extreme value of water hammer pressure in the water delivery system.【Conclusion】The pumping interval is longer than 240 s,it has almost no effect on the stability of the water delivery system.The greater pipe roughness is unfavorable for the system stability under typical working conditions.The addition of 3#shaft as a surge tank requires a lot of maintenance costs,and has little effect on the extreme value of water hammer pressure in the water delivery system,so it is not recommended to set it as a surge tank.
作者
冯艳
张钦
瞿方乐
FENG Yan;ZHANG Qin;QU Fangle(PowerChina ZhongNan Engineering co.,Ltd,Changsha 410014,China)
出处
《灌溉排水学报》
CAS
CSCD
北大核心
2023年第S01期170-174,共5页
Journal of Irrigation and Drainage
