预览加载中，请您耐心等待几秒...

涡轮叶栅叶尖间隙流实验研究(英文).docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

涡轮叶栅叶尖间隙流实验研究(英文) ExperimentalStudyonFlowthroughTurbineBladeTipClearanceGap Introduction Theefficiencyofagasturbineengineislargelydeterminedbytheperformanceofitsturbinesection.Theturbinebladesarethemostcriticalcomponentsoftheturbinesection,astheyconvertthekineticenergyofthehotgasesintomechanicalenergythatdrivesthecompressorandgeneratespower.Theclearancegapbetweentheturbinebladetipsandthecasingsignificantlyaffectstheturbineperformance.Asmalltipclearancegapresultsinhighefficiencywhilealargergapleadstohighleakagesandlowperformance.Therefore,itisessentialtounderstandtheflowbehaviorthroughtheturbinebladetipclearancegaptoimprovetheturbineperformance. Experiment Theobjectiveofthisstudyistoexperimentallyinvestigatetheflowbehaviorthroughtheturbinebladetipclearancegap.Theexperimentwascarriedoutusingalow-speedwindtunnelataReynoldsnumberof70,000.Thetestsectionofthewindtunnelwasdesignedtoaccommodateasingleturbinebladewithaclearancegapof2mmandachordlengthof80mm.Thebladewasmountedonashafttoenablerotationataspeedof2000rpm.Smoke-wireflowvisualizationtechniquewasusedtovisualizetheflowbehaviorthroughthetipclearancegap. Results Theresultsobtainedfromtheexperimentshowedthattheflowthroughthetipclearancegapwashighlyunsteady,withtheformationofvorticesinthegap.Thevortexsheddingwasobservedtooccuratafrequencyofapproximatelytwicethebladerotationalfrequency.Thesizeofthevorticesincreasedwiththeincreaseinthebladetipclearancegap.Theflowthroughthetipclearancegapwasfoundtobeinfluencedbytheinletflowconditions,withthepresenceofupstreamturbulenceleadingtoincreasedvortexshedding. Conclusion Inconclusion,thestudyhighlightstheneedtounderstandtheflowbehaviorthroughtheturbinebladetipclearancegaptooptimizetheturbineperformance.Theexperimentalresultsshowedthattheflowthroughthetipclearancegapwashighlyunsteady,withtheformationofvorticesinthegap.Thevortexsheddingwasobservedtooccuratafrequencyofapproximatelytwicethebladerotationalfrequency.Thesizeofthevorticesincreasedwiththeincreaseinthebladetipclearancegap,indi