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ID:55722172
大小:1.13 MB
页数:6页
时间:2020-06-01
《旋转带肋回转通道流动换热数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第48卷第2期西安交通大学学报Vo1.48NO.22014年2月JOURNALOFXI’ANJIAOTONGUNIVERSITYFeb.2O14DOI:10.7652/xjtuxb201402021旋转带肋回转通道流动换热数值模拟赵曙,朱惠人,郭涛,张丽,孙瑞嘉。(1.西北工业大学动力与能源学院,710072,西安;2.中国航空动力机械研究所,412002,湖南株洲)摘要:为进一步了解涡轮动叶旋转内冷通道的流动换热规律,选取动叶内通道的相似放大模型进行实验和数值模拟研究。通道进口雷诺数为17000,3个
2、出口的流量分配比为1:2:1,旋转半径与水力直径比为46.4,旋转数分别为0和0.09。静止实验测量了沿程静压系数和努赛尔数(Nu)分布,三维数值模拟了旋转通道内部涡结构对流动换热的影响。结果表明:旋转造成通道涡偏移,改变了速度场分布,使哥氏力指向的壁面附近流速增加;旋转离心力使径向出流沿程静压系数逐渐增加,径向入流沿程静压系数迅速降低;肋扰流涡使沿程展向平均Nu呈多波峰状分布;转弯回流涡使得转弯下游通道的Nu不对称分布;旋转促使内通道的流体偏向哥氏力指向的壁面,增加了径向出流压力面和径向入流吸力面的N
3、u。关键词:涡轮叶片;带肋通道;旋转;对流传热;数值计算中图分类号:V231.1文献标志码:A文章编号:0253-987X(2014)02—0125—06NumericalPredictionsofFlowandHeatTransferforRotatingInternalCoolingChannelswithRibTurbulatorsZHAoShu,ZHUHuiren,GUOTao,ZHANGLi,SUNRuijia。(1.CollegeofPowerandEnergy,NorthwesternPo
4、lytechnicalUniversity,Xi’an710072,China2.ChinaAviationPowerMachineryResearchInstitute,Zhuzhou,Hunan412002,China)Abstract:Toinvestigateflowandheattransferinarotatinginternalchannelofthemovingblade,experimentsandnumericalsimulationsforasimilarlyamplifiedch
5、annelmodelwith90。ribsareconducted.TheinletReynoldsnumber,flowratedistributionratioandgeometricdimensionlessratioaretakenas17000,1:2:1and46.4respectively,therotatingnumberisconsideredas0and0.09.Theheattransfercoefficientdistributionandstaticpressurecoeffi
6、cientareexaminedbyexperiments.Theeffectsofvortexonflowandheattransferinrotatinginternalcoolingpassageareachievedwith3-Dnumericalsimulation.Theresultsshowthatvortexshiftinrotatingchannelchangesvelocityfield,andthestaticpressurecoefficientincreasesalongrad
7、ialoutflowanddecreasesalongradialinflowduetocentrifugalforce.ThelaterallyaveragedNudistributesinmultiple—peakformastheresultofsecondaryflowinducedbyribturbulators.TheNudistributiondownstreamofturningareagetsasymmetricduetoturningeddy.Thefluidshifttendsto
8、wardthewallthattheCoriolisforcepointsto.Consequently,theNuontheradialoutflowpressuresurfaceandradialinflowsuctionsurfaceincreases.Keywords:turbineblade;ribbedchannel;rotating;convectiveheattransfer;numericalSjmu1ation收稿日期:
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