水泵水轮机内部压力脉动特性研究  

Research on characteristics of pressure fluctuation in a pump-turbine

作　　者：吴广宽[1] 罗兴锜[1] 赵强[1] 冯建军[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《西安理工大学学报》2015年第3期265-272,共8页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51339005;51379174;51479167)

摘　　要：为了研究水泵水轮机内部不同部位处的压力脉动特性,采用计算流体动力学软件对设计工况点下水泵水轮机三维全流道内部流动进行了非定常数值计算,同时监测了蜗壳隔舌附近、顶盖处、转轮与活动导叶之间以及尾水管锥管处的压力脉动。通过分析计算所得的压力脉动结果表明:机组顶盖区域压力脉动相对较为明显,水轮机工况下的脉动频率以2倍叶倍频为主,水泵工况时脉动频率以1倍的叶倍频为主;对于转轮与导叶间的无叶区域,水泵工况和水轮机工况脉动频率均为1倍叶倍频,且该处的监测点的压力脉动频率主要由于转轮与活动导叶之间的动静干涉产生;在转轮内水轮机工况时的压力脉动频率呈现多样性,水泵工况时则都以转频的倍数为主;尾水管直锥段的主频率在最优工况下等于1倍叶倍频,振动幅值较小。In order to study the pressure fluctuation characteristics on different parts of the pump-turbine,this paper adopts computational fluid dynamics software to conduct unsteady numerical calculation on three-dimensional full port internal flow under the design point of the pump-tur-bine,and simultaneously monitors pressure fluctuation on places near the volute tongue insula-tion,on the head cover,between the runner and the guide vane and in the draft tube taper pipe. It can be concluded from the analysis and calculation of the pressure fluctuation results that：in the head cover area of the units,pressure fluctuation is relatively obvious and under the turbine working condition,the pulse frequency is mainly twice as much as the leaf frequency.Moreover, under the pump condition,the pulse frequency is mainly one time as much as the leaf frequency. For the bladeless area between the runner and the guide vane,pulse frequency under both pump condition and turbine condition approaches one time of the leaf frequency,and pressure pulsation frequency under this monitor point is mainly resulted by rotor-stator interaction between the run-ner and the guide vane.In the runner area,the pressure pulsation frequency under turbine condi-tion shows diversity,while the frequency under pump condition is mainly multiple of rotating fre-quency.The main frequency of the draft tube＆#39;s straight taper section under the optimal condition equals to one time of the rotating frequency,and the vibration amplitude is relatively smaller.

关 键 词：水泵水轮机 内部流动 压力脉动 数值计算 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]