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ID:46737520
大小:1.60 MB
页数:5页
时间:2019-11-27
《泵-管路系统的汽蚀自激振荡特性分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第41卷第5期火箭推进V01.41.№.52015年10月JOURNALOFROCKETPROPULSIONOct.2015泵一管路系统的汽蚀自激振荡特性分析严俊峰,陈晖,逯婉若(西安航天动力研究所,陕西西安710100)摘要:在带诱导轮离心泵试验中,当泵流量很小时,泵进出口压力均出现了幅值未发生衰减的低频振荡,这与高速离心泵的频率特征形成对比,表明泵一管路系统内发生了自激振荡。泵在小流量下工作时,会出现与主流区强烈作用的回流区,该反向回流在诱导轮叶片工作面上形成漩涡并随诱导轮一起旋转,引起主流液体的静压降低及空泡体积的周期性变化,由此产生了汽蚀
2、自激振荡。利用空泡动力学模型对低频汽蚀自激振荡特性进行计算,得到了带诱导轮离心泵一管路系统的振荡频率、进口压力及流量的动态特性、流量一进口压力极限环等。结果表明,计算的汽蚀自激振荡特性与试验值接近,汽蚀自激振荡数学模型合理可行;泵转速及进口管长度越小,泵进口压力和流量越大,汽蚀自激振荡的频率就越大。关键词:离心泵;管路系统;汽蚀自激振荡;动态特性;极限环中图分类号:V434—34文献标识码:A文章编号:1672—9374(2015)05—0029—05Analysisoncharacteristicsofself-excitedcavitatio
3、noscillationinpump--pipingsystemYANJunfeng,CHENHui,LUWanruo(Xi’anAerospacePropulsionInstitute,Xi’an710100,China)Abstract:Thelowfrequencyoscillationofinletpressureandoutletpressureoccurredinaninducer—centrifugalpumptestwhenflowinthepumpwassmall,whichcontrastswiththefrequencych
4、aracteristicsofhighspeedcentrifugalpump.Thisindicatesthattheself-excitedoscillationoccursinthepump—pipingsystem.Whenthepumpisoperatingatoff-designconditions,thebackflowzoneintensivelyinteractingwithmainflowzonemayappear.Thisbackflowisrotatedwiththeinducer,whichwilldecreasethe
5、staticpressureofthemainstreamliquidandresultinaperiodicalchangeofthephysalidesvolume,andthentheself-excitedcavitationoscillationOCCURS.Inordertoanalyzethecharacteristicsoftheself-excitedcavitationoscillation,anovelcavitationdynamicmodelispresentedtosimulatethedynamiccharacter
6、istictocapturetheoscillationfrequencyinthepump—pipingsystem,thedynamiccharacteristicsofinletpressureandflowrate,andthelimitcycleofflowrateversusinletpressure.Theresultsofnumericalexperimentsindicatethatthecalculatedcharacteristicsof收稿日期:2015—04—23;修回日期:2015—06—08作者简介:严俊峰(1980
7、一),男,硕士,高级工程师,研究领域为涡轮泵设计30火箭推进2015年10月self-excitedcavitationoscillationiSconsistentwithexperimentalresult,thiscavitationself-excitedmathematicmodeliSsuitabletosimulatethecharacteristicsoftheself-excitedcavitationoscillation.Theoscillation仔equencyincreaseswithdecreaseofthepump
8、speedandthelengthofinletpiping,whiletheoscillationfrequencydecreases
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