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1、文章编号:一种双S弯非常规进气道地面工作状态的试验靖建朋,郭荣伟(南京航空航天大学能源与动力学院,江苏南京210016)摘要:对一种双S弯非常规进气道进行了地面工作状态下的试验研究,得到了该类进气道的地面工作特性,结果表明:①双S弯非常规进气道在地面工作状态下,随着川口马赫数的增加,总圧恢复系数呈下降趋势;稳态周向畸变指数、紊流度和综合崎变指数均上升;稳态径向畸变指数变化不人。②与飞行状态F的高速风洞流场控制试验研究结果和比,在相同的出口马赫数下,地而抽吸试验中进气道出口截而的总压恢复系数较低,稳态周向畸变指数
2、、紊流度和综合畸变指数较人,本研究的双S弯非常规进气道在出口马赫数.%=()•45时,总压恢复系数为0.90,稳态周向畸变指数达到了9.24%,紊流度为4.6%,综合畸变指数为13.85%,畸变比较大,超出了一般发动机的承受范围。③在地而抽吸状态卜•,进气道出口马赫数.嗨0.37时,综合畸变指数^10%,说明发动机叮在适当的降转速下稳定工作,随着飞机在地面滑行速度的增加,满足发动机稳定工作要求的进气道最大出口马赫数不断增加。关键词:双S弯;非常规进气道;地面丁•作状态;地面抽吸;地面滑行;总压恢复系数;畸变指数
3、中图分类号:V231.3文献标识码:AExperimentalstudyofaserpentineinletundergroundrunningJINGJian-peng,GUORong-wei(CollegeofEnergyandPowerEngineering,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,China)Abstract:Experimentsofaserpentineinletundergroundrunninghav
4、ebeendoneanddescribedinthispaper.Thestudywasperformedinalowspeedwindtunnelwithanindependentair-pumpingsystemwhichmakersthefreeairstreamflowatzeroanddifferentspeeds・Theresultsshowthat:(l)WhentheinletMachnumberoftheflowatexitincreases,thetotalpressurerecoveryd
5、ecreases,andthecircularsteadytotalpressuredistortioncoefficient,turbulenceintensityandsynthesisdistortionincrease.Incomparisonwiththeresultsmeasuredinhigh-speedwindtunneltestsfortheserpentineinletatthesameexitMachnumber,thetotalpressurerecoveryislowerandthec
6、ircularsteadytotalpressuredistortioncoefficient,turbulenceintensityandsynthesisdistortionarelarge匚(2)Undergroundair-pumprunning,whentheserpentineinletisrunningattheexitMachnumberMe=0A5,thetotalpressurerecoverycoefficientequals0.90,circularsteadytotalpressure
7、distortioncoefficientequals9.24%,turbulenceintensityequals4.6%,andsynthesisdistortionequals13.85%,soitcanbeseenthatthedistortionoftheflowdeliveredbytheinletmaybetoolargetofittheengine.(3)Whentheair-pumpingsystemandthewindtunnelareoperatingtogether,asithappen
8、swhentheplaneisgroundtaxiing,theperformanceoftheinletisgettingbetterwiththewindspeedincreasing.Keywords:serpentineinlet;groundrunning;air-pumping;groundtaxiing;totalpressurerecovery;distortionco