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1、第51卷第7期西安交通大学学报Vol.51No.72017年7月JOURNALOFXI’ANJIAOTONGUNIVERSITYJuly2017DOI:高主流湍流度下大倾角异型气膜孔冷却特性实验研究12翟颖妮，刘存良(1.西安建筑科技大学机电工程学院，710055，西安；2.西北工业大学动力与能源学院，710072，西安)摘要：为了研究高主流湍流度下大倾斜角异型气膜孔的冷却特性，在主流湍流度为11.82%的流动工况下，采用瞬态液晶传热测量技术对倾斜角均为60°的圆柱孔、水滴孔以及曲面簸箕孔进行了研究。在吹风比0.5工况下，3种孔型的气膜贴壁性都较好，
2、上游冷却效率高于下游；在吹风比1.0工况下，圆柱孔和水滴孔出现气膜脱离壁面再附着现象，上游冷却效率低于下游；在更大吹风比下，曲面簸箕孔气膜也出现脱离再附着现象。吹风比的增加会显著增强各个气膜孔的对流换热强度，曲面簸箕孔的换热系数比在各个吹风比下都低于圆柱孔和水滴孔，圆柱孔和水滴孔的换热系数比在上游区域较高，而曲面簸箕孔的换热系数比在大吹风比下呈现出先上升后下降的分布特征。实验结果表明，在高主流湍流度条件下，大倾斜角水滴孔和圆柱孔的气膜冷却效果相近，曲面簸箕孔的气膜冷却效果优于这两种孔型。关键词：气膜冷却；异型气膜孔；高主流湍流度；冷却效率；换热系数比
3、中图分类号：V231.3文献标志码：A文章编号：0253-987X(2017)07-0000-00ExperimentalStudyonFilmCoolingCharacteristicsofShapedFilmHoleswithLargeInclinationAngleunderHighTurbulenceIntensity12ZHAIYingni,LIUCunliang(1.DepartmentofMechanical&ElectricalEngineering，Xi’anUniversityofArchitecture&Technology,X
4、i’an710055,China;2.SchoolofPowerandEnergy,NorthwesternPolytechnicalUniversity,Xi’an710072,China)Abstract:Inordertoobtainthefilmcoolingcharacteristicsofshapedfilmholeswithlargeinclinedangleunderhighmainstreamturbulenceintensity,threefilmholeconfigurationswithinclinedangleof60°,i
5、ncludingcylindricalhole,water-dropholeandcurveddustpanhole,werestudiedundermainstreamturbulenceintensityof11.82%usingthetransientliquidcrystalmeasurementtechnique.Atblowingratioof0.5,thefilmattachonthewallwellforallthethreeholeconfigurations,andthefilmcoolingeffectivenessinupst
6、reamregionishigherthanthatindownstreamregion.Atblowingratioof1.0,thefilmjetsliftofffromthewallforcylindricalholeandwater-drophole,resultinginlowerfilmcoolingeffectivenessinupstreamregion.Withfurtherincreaseofblowingratio,thefilmjetsofcurveddustpanholealsoliftofffromthewall.With
7、theincreaseofblowingratio,theheattransferintensitywasenhancedobviouslyforallthethreeholeconfigurations.Theheattransfercoefficientratioofcylindricalholeandwater-dropholedecreasesgraduallyalongthestreamwisedirection.Andtheheattransfercoefficientratioofcurveddustpanholeislowerthan
8、thatofcylindricalholeandwater-dropholeunderallblowingr
