考虑动态摩阻的抽水蓄能电站水力瞬变建模模拟  

Numerical simulation of hydraulic transients in pumpedstorage power station with unsteady friction

作　　者：吴金远 周领[1] 刘德有[3] WU Jinyuan;ZHOU Ling;LIU Deyou(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;International Center on Small Hydro Power,Hangzhou,Zhejiang 310002,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]上海市政工程设计研究总院(集团)有限公司,上海200092 [3]国际小水电中心,浙江杭州310002

出　　处：《排灌机械工程学报》2024年第6期612-618,648,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51839008,51679066);霍英东教育基金会青年教师基金项目(161068)。

摘　　要：针对抽水蓄能电站管道内水力瞬变问题,考虑动态摩阻,采用二阶有限体积法(FVM)Godunov格式进行数值建模与模拟.首先根据有限体积法将控制方程进行离散,通量计算用Riemann求解器.机组全特性曲线采用改进的Suter变换,在计算中分别考虑Brunone与TVB动态摩阻模型,将计算结果与恒定摩阻和试验值进行对比,并进行了相应的参数敏感性分析.结果表明,在抽水蓄能电站管路模型中,动态摩阻模型仅增加了管道内后续波动的衰减,对于初始波动几乎没有影响.在单管中,动态摩阻的影响随着关阀时间的缩短而增大;而在抽水蓄能电站系统中由于雷诺数较大,动态摩阻模型的适用性较差,对于各项物理参数的变化均不敏感.这表明在大管径、高流速的输水工程中,可忽略动态摩阻的影响,但对于小管径、低流速的工程,有必要考虑动态摩阻的影响.By taking unsteady friction into account,the second-order finite volume method(FVM)Godunov scheme was utilized to undertake numerical simulation in order to investigate the hydraulic transient problem in the pipelines of pumped storage power plants.Firstly,the governing equations of the mathematical model were discretized according to the finite volume method,and the flux was calculated using the Riemann solver.The whole characteristic curves of the unit were transformed by using the improved Suter approach,and the Brunone and TVB unsteady friction models were respectively considered in the calculation.The calculated results of the proposed scheme were compared with that of the steady friction scheme and the measured data,and the corresponding parameter sensitivity analysis was also performed.The results show that the unsteady friction only increases the attenuation of subsequent fluctuations in the pipeline,but has little effect on the initial fluctuations in the pumped storage station pipe network model.In a single pipe,the influence of unsteady friction increases with the shor-tening of valve closing time.Due to the large Reynolds number in pumped storage power station systems,the unsteady friction model has poor applicability and is insensitive to changes in the related physical parameters.This shows that in water transmission projects with large pipe diameters and high flow rates,the impact of dynamic friction can be ignored,but for projects with small pipe diameters and low flow rates,the consideration of dynamic friction is still necessary.

关 键 词：抽水蓄能水电站 有限体积法 Godunov格式 动态摩阻 水力瞬变 

分 类 号：TV143.1[水利工程—水力学及河流动力学]