水泵水轮机内部压力脉动特性研究.pdf

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1、西安理工大学学报JournalofXi’anUniversityofTechnology(2O15)Vo1．31No．3265文章编号：1006—4710(2015)03—026508水泵水轮机内部压力脉动特性研究吴广宽，罗兴铸，赵强，冯建军(西安理工大学水利水电学院，陕西西安710048)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

2、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。关键词：水泵水轮机；内部流动；压力脉动；数值计算中图分类号：TP391．9文献标志码：AResearchoncharacteristicsofp

3、ressurefluctuationinapump—turbineWUGuangkuan，LUOXingqi，ZHAOQiang，FENGJianjun(FacultyofWaterResourcesandHydroelectricEngineering，Xi’anUniversityofTechnology，Xi’an710048。China)Abstract：Inordertostudythepressurefluctuationcharacteristicsondifferentpartsofthepump—turbine，thi

4、spaperadoptscomputationalfluiddynamicssoftwaretoconductunsteadynumericalcalculationonthree—dimensionalfullportinternalflowunderthedesignpointofthepump—tur—bine，andsimultaneouslymonitorspressurefluctuationonplacesnearthevolutetongueinsula—tion，ontheheadcover，betweentherun

5、nerandtheguidevaneandinthedrafttubetaperpipe．Itcanbeconcludedfromtheanalysisandcalculationofthepressurefluctuationresultsthat：intheheadcoverareaoftheunits，pressurefluctuationiSrelativelyobviousandundertheturbineworkingcondition，thepulsefrequencyismainlytwiceasmuchasthele

6、affrequency．Moreover，underthepumpcondition，thepulsefrequencyismainlyonetimeasmuchastheleaffrequency．Forthebladelessareabetweentherunnerandtheguidevane，pulsefrequencyunderbothpumpconditionandturbineconditionapproachesonetimeoftheleaffrequency，andpressurepulsationfrequency

7、underthismonitorpointismainlyresultedbyrotor——statorinteractionbetweentherun—nerandtheguidevane．Intherunnerarea，thepressurepulsationfrequencyunderturbinecondi—tionshowsdiversity，whilethefrequencyunderpumpconditionismainlymultipleofrotatingfre—quency．Themainfrequencyofthe

8、drafttube'sstraighttapersectionundertheoptimalconditionequalstoonetimeoftherotatingfrequency，andthevibr