摘要
在长距离输水管道水力过渡计算中,空气阀进排气系数多采用常量,为探究防水锤空气阀进排气系数对管道压力变化的影响,通过Fluent软件对DN100防水锤空气阀模拟得到-9~11 kPa的质量流量,并建立不同压差的动态进排气系数曲线,以西山一级提水泵站为例,对空气阀进排气系数分别采用动态值和固定值(均值0.55)进行过渡过程计算并对比分析。数值模拟结果表明,空气阀采用改进后的动态进排气系数对管道负压影响较小,对正压影响较大,且改进后的动态进排气系数有效降低了管道内的压力波动,在泵站实际运行中需关注管路正压变化并注意加强防护,水锤防护计算时应根据空气阀进排气实测资料进行计算,研究结果可为泵站运行中空气阀的水力过渡计算提供一些参考。
In the hydraulic transition calculation of long-distance water transmission pipeline, the intake and exhaust coefficient of air valve is mostly constant. In order to explore the influence of the intake and exhaust coefficient of water hammer air valve on the change of pipeline pressure, the DN100 water hammer air valve was simulated by FLUENT software to obtain the mass flow at-9 kPa-11 kPa, and the dynamic intake and exhaust coefficient curves with different pressure differences were established. Taking Xishan primary water lift pump station as an example, dynamic value and fixed value were adopted for air valve inlet and exhaust coefficient respectively(mean value 0.55) to calculate and compare the transition process. The numerical simulation results show that the improved dynamic inlet and exhaust coefficient of the air valve has little impact on the negative pressure of the pipeline and great impact on the positive pressure. The improved dynamic inlet and exhaust coefficient effectively reduces the pressure fluctuation in the pipeline. In the actual operation of the pump station, it is necessary to pay attention to the positive pressure change of the pipeline, and strengthen protection. The calculation of water hammer prevention should be based on the measured data of air valve inlet and exhaust. The research results can provide some references for the hydraulic transition calculation of air valve in the operation of pump station.
作者
原明泽
吴建华
郭霄宵
刘金昊
耿子健
YUAN Ming-ze;WU Jian-hua;GUO Xiao-xiao;LIU Jin-hao;GENG Zi-jian(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan O030024,China)
出处
《水电能源科学》
北大核心
2023年第1期194-197,185,共5页
Water Resources and Power
基金
山西省基础研究计划(自然科学研究面上项目)(20210302123169)。
关键词
防水锤空气阀
节流塞
动态进排气系数
水力计算模型
water hammer air valve
throttle plug
dynamic intake and exhaust coefficient
hydraulic calculation model
