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大小:1.93 MB
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时间:2020-02-29
《带冠喷气涡轮叶栅气动性能研究.pdf》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381期工程热物理学报Vol.38No.l卷第,20171OINTHSICSJan.1年月JOURNALFENGEERINGERMOPHY,207带冠喷气滴轮叶栅气动性能研究刘艳张敏张梦超张天龙贺櫻大连理工大学能源动力学院,大连116024()一摘要多种控制技术耦合应用是涡轮叶栅间隙泄漏流动研究的趋势之,.结合围带与喷气两种控制方法本文通过实验与数值模拟研究了喷气对带冠涡轮叶栅气动性能的影响机理,探讨了测量截面上的损失分布以及叶栅通道内涡系的演
2、变规律,。研究发现,与带冠无喷气叶栅相比,喷气改变了泄漏流体的流动方向使泄漏涡尺寸有所增加。但喷气改善了叶顶附近总压分布.,因而03%主流流量喷气使叶栅气动性有所提高,。喷气可以降低间隙入口流量且由于喷气M小于减小的间隙入口主流流董,因而带冠叶栅中,喷气使间隙出口流流量减小。关键词带冠?;喷气;间隙泄漏流,泄漏涡;气动性能--中图分类号:V231.3文献标识码:A文章编号:0253231X2〇1701007407()AerodynamicPerformanceof
3、ShroudedTurbineCascadeWithTipInjectionLIUYanZHANGMMen--inZHANGgChaoZHANGTianLongHEYingSchoolofEnergyandPowerEnineerin,DalianUniversityofTechnolog,alian116024ChinagyD,)(gAbstractItisatendencythatvarioustipdesensi
4、tizationtechniquesarecombinedtocontrolthetipleakaeflowinturbines.Basedonthisthetishroudandtiinectiontechniuesaresimultaneouslg,ppjqyconsideredforaturbinecascade.Experimentsandnumericalsimulationsareconductedtoinv
5、estigateimpactsofthetipinjectionontheaerodynamicperformanceoftheshroudedcascade.Distributionsoftotalpressurelosscoefficientsonanexaminedplaneandevolutionofdifferentvorticeswithinbladecascadeareex.hploredResultsin
6、dicatethatrelativetotheshroudedcascadewithouttipinectiontej,tipetalterstheorientationofthetileakageflowandincreasesthesizeofthetileakagevortex.jppHowevertheaerodnamicerformanceoftheshroudedcascadewithatipinect
7、ionbein0.3%of,ypjgthemainstreammassflowisimproved.Thisisattributedtoaphenomenonthatthetipinjectioncanmodifythetotalpressureonregionsnearthecasingendwall.Moreover,thetipjetpreventsthemainstreamflowfrompenet
8、ratingintothetipgapandthecorrespondingreductionismorethanthetiinectionmassflow.Conseuentlattheexitofthetiathetileakagemassflowrateispjqy,pgp,pdecreasedfortheshroudedcascadewithtiinection.pjKetiieakaeflowilea
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