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1、第57卷第1期汽輪機技術(shù)Vo1.57No.12015年2月TURBINETECHN0L0GYFeb.2015葉尖及尾緣出流條件下葉片通道壓力分布特性實驗研究梁衛(wèi)穎,朱惠人,張麗,許都純(西北工業(yè)大學動力與能源學院,西安710072)摘要:為掌握某型高壓渦輪葉片葉尖及尾緣出流流量分配比例對葉片內(nèi)部氣冷通道壓力系數(shù)沿程分布特性的影響,通過實驗測量了進口雷諾數(shù)9000~20000,前緣通道頂部除塵孔、尾緣通道頂部除塵孔及側(cè)壁出流孔排共3處出流位置的4種出流流量分配比例下葉片通道壓力系數(shù)沿程分布,實驗結(jié)果表明:(1)各出流位置出流比例一定,進口雷諾數(shù)變化對通道壓力系數(shù)沿程分布特性沒有影響;(2
2、)進口雷諾數(shù)一定,前緣通道頂部除塵孑L是否出流對通道壓力系數(shù)沿程分布特性有根本影響,出流導致前緣通道壓力系數(shù)沿程下降較快,壓力損失增加;中間通道壓力系數(shù)沿程略有上升,尾緣通道壓力系數(shù)沿程下降趨勢平緩,兩者壓力損失均減??;(3)前緣通道頂部除塵孔無出流時,尾緣通道頂部除塵孔與側(cè)壁出流孔排之間出流流量分配比例變化對前緣及中間通道壓力系數(shù)沿程分布特性沒有影響,僅影響尾緣通道。隨著尾緣側(cè)壁出流流量分配比例增大,尾緣通道壓力系數(shù)沿程上升,壓力損失減小。關(guān)鍵詞:渦輪葉片;內(nèi)冷通道;壓力系數(shù);尾緣分類號:V231文獻標識碼:A文章編號:1001—5884(2015)01-0001-05Experim
3、entalInvestigationofPressureDistributionCharacteristici13TurbineBladeChannelwithTipandTrailingEdgeOutflowConditionLIANGWei.ying.ZHUHui.ren.ZHANGLi,XUDu.chun(SchoolofPowerandEnergyNorthwesternPolytechnicalUniversity,Xi’an710072,China)Abstract:Experimentmeasurementhadbeenperformedtoacquirepressure
4、coeficientdistributioninturbinebladeinternalcoolingchannelwithinletReynoldnumber9000~20000andfourdifferentoutflowrateallocationratiosofthreedifferentoutletplaces,suchasleadingedgetiphole,trailingedgetipholeandtrailingedgelateralejectionholes.Thispurposeisforunderstandinginfluenceofdifferentoutfl
5、owrateallocationratiobetweentipsandtrailingedgeonpressurecoeficientdistributioncharacteristicinhighpressureturbinebladeinternalcoolingchanne1.Theresultsshowthat:(1)differentinletReynoldnumberdoesntaffectthepressuredistributioncharacteristicinturbinebladeinternalcoolingchannelasoutflowrateallocat
6、ionratioisfixed.(2)thereisoutflowratefromleadingedgetipholeornotwillaffectpressurecoeficientdistributioncharacteristicinturbinebladeinternalcoolingchannelfundamentally,whileinletReynoldnumberisfixed.Thepressurecoeficientdeclinessharplyandpressurelossisincreasingintheleadingedgechannel;butitascen
7、dslightlyinthemiddlechannelanddescendsgentlyinthetrailingedgechannel,thepressurelossbothinthemiddleandtrailingedgechanneldecreases.(3)whenthereisn’toutflowratefromleadingedgetiphole,differentoutflowrateallocationbetweentrail