抽水蓄能电站泵工况断电过渡过程数值试验  

Numerical experiments in power-off transient process of pumped storage power station under pump condition

作　　者：周大庆[1] 张蓝国[1] 

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《华中科技大学学报（自然科学版）》2014年第2期16-20,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51106042)

摘　　要：建立包括引水系统、调压井、水泵水轮机组与尾水系统等部件的抽水蓄能电站几何模型,采用基于VOF两相流模型的三维湍流计算方法对其泵工况断电过渡过程进行了数值试验研究,获得并分析了若干参数随时间的变化规律和不同时刻流场的演变过程,与电站原型试验资料进行了对比.结果表明:机组转速、蜗壳和尾水管进口静压极值与试验结果基本一致,三维湍流过渡过程研究方法具有较高精度.电站外特性变化剧烈,依次经历水泵、制动和水轮机瞬态工况.各部件流场的演变与外特性的变化密切相关,相互影响.制动工况流量变化存在'拐点',相应时刻反向流量最大,叶片压力不均匀,尾水管流态较差,有明显的水击现象.Three dimensional unsteady numerical simulations based on VOF （volume of fluid） model were executed on geometrical model of the whole flow system including diversion ,tunnel ,surge tank , pump turbine unit and tailrace tunnel .T hrough numerical calculation ,the changeable flow configura-tion and variation law of some parameters such as unit rotate speed ,flux and static pressure of meas-urement points were obtained and compared with experimental date .Numerical results show that ex-treme value of unit rotate speed and measurement points’ static pressure agree fairly well with experi-mental date .The unit will undergo pump condition ,braking condition and turbine condition with ex-ternal characteristic varying significantly during power-off transient process .Internal flow configura-tion is closely related to external characteristic and affects each other .The flux variation trend will change rapidly w hen the maximum reverse flux appears under braking condition ,so there is one sharp turning point on the flux-time curve .At that moment ,the blade pressure is very uneven ,flow field gets worse in draft tube and water hammer is violent .

关 键 词：抽水蓄能电站 泵工况 过渡过程 断电 数值试验 

分 类 号：TV743[水利工程—水利水电工程] TK734[交通运输工程—轮机工程]