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《渦輪葉片吸力面上收斂縫形孔氣膜冷卻對(duì)葉柵氣動(dòng)損失的影響》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、第31卷第7期航空學(xué)報(bào).V01.31No.72010年7月ACTAAERONAUTICAETASTRONAUTICASINICAJuly2010文章編號(hào):1000—6893(2010)07—1312—06渦輪葉片吸力面上收斂縫形孔氣膜冷卻對(duì)葉柵氣動(dòng)損失的影響姚玉1,張靖周1,何飛2,郭文3(1.南京航空航天大學(xué)能源與動(dòng)力學(xué)院,江蘇南京210016)(2.洪都航空工業(yè)集團(tuán),江西南昌330024)(3.中國燃?xì)鉁u輪研究院,四川成都610500)NumericalInvestigationonAerodynamicLoss
2、ofTurbineCascadewithConvergingSlotHoleFilmCoolingatSuctionSurfaceYaoYul,ZhangJingzhoul,HeFei2,GUOWan3(1.CollegeofEnergyandPowerEngineering,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,China)(2.HongduAviationIndustryGroup,Nanchang330024.China)(3.C
3、hinaGasTurbineEstablishment,Chengdu610500。China)摘要:運(yùn)用RNG湍流模型對(duì)具有氣膜冷卻的渦輪葉柵通道內(nèi)部的三維流場進(jìn)行了數(shù)值模擬,分析在葉柵通道主流人口雷諾數(shù)Re=4×105~6×105和二次流吹風(fēng)比M一0.5~3.0范圍內(nèi),沿吸力面3個(gè)典型弦向位置處(分別對(duì)應(yīng)葉柵通道喉部上游、喉部和喉部下游)開設(shè)收斂縫形孔對(duì)葉柵通道損失系數(shù)的影響。計(jì)算結(jié)果表明:冷氣噴射僅對(duì)孔附近區(qū)域的壓力系數(shù)產(chǎn)生影響;位于喉部上游位置收斂縫形孔的能量損失及總壓損失系數(shù)最低,大部分工況中位于喉部下游位
4、置收斂縫形孔的損失系數(shù)最高;與圓形孔相比,位于喉部上游位置收斂縫形孔既具有好的冷卻效率又具有低的損失系數(shù)。關(guān)鍵詞:收斂縫形孔;氣動(dòng)損失;氣膜冷卻;渦輪葉柵;吸力面中圖分類號(hào):V231.1文獻(xiàn)標(biāo)識(shí)碼:AAbstraet:Thethree-dimensionalturbulentflowinaturbinecascadewithbladefilmcoolingisnumericallyin—vestigatedusingaRNGturbulencemodelunderdifferentReynoldsnumbersran
5、gingfrom4×105tO6×105andblowingratiosrangingfrom0.5to3.0.Theinfluenceoftheconvergingslotholelocationatthebladesuctionsurface(correspondingtOtheupstreamofthethroat,thecascadethroatandthedownstreamofthethroat)ontheaerodynamiclossoftheturbinecascadeisinvestigated.R
6、esultsshowthattheinjectionfromtheconvergingslotholeshaseffectonlyonthepressurecoefficientdistributionnearthefilmcoolingholes.Thekineticlossandtotalpressurelossinducedbytheinjectionfromthefilmholeslocatedattheupstreamofthethroatarelowerthanthoseinducedbytheother
7、tWOlocations,whiletheaerodynamiclosscoefficientscorrespondingtOthedownstreamofthethroatlocationarethelargestinmostcases.Comparedwithcylindricalholes,thecon-vergingslotholesattheupstreamofthethroatexhibitbothhighercoolingeffectivenessandloweraerodynamiclosscoeff
8、icient.Keywords:convergingslothole;aerodynamicloss;filmcooling;turbinecascade;suctionsurface氣膜冷卻因其固有的高效冷卻特性已被廣泛地應(yīng)用于渦輪葉片上,雖然注入的冷氣降低了葉片表面的溫度,但冷氣噴射卻會(huì)帶來葉柵通道的氣動(dòng)損失,即氣膜出流與主流的摻混損失以及