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ID:46633856
大小:3.38 MB
页数:7页
时间:2019-11-26
《底部结构对飞行器阻力特性的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第33卷第5期计算机仿真2016年5月文章编号:1006—9348(2016)05—0105—06底部结构对飞行器阻力特性的影响王文龙,李桦,刘枫,潘沙(国防科学技术大学航天科学与工程学院,湖南长沙410073)摘要:为优化底部形状减小底部阻力,研究底部流场结构对超声速飞行器的阻力特性影响,采用计算流体动力学方法,建立了雷诺平均Ns方程数值求解方法。通过与实验数据比较,验证了方法的可靠性,对含圆柱尾部、船尾的典型飞行器在不同马赫数和攻角下进行数值仿真。仿真结果表明:船尾设计具有减阻效果,且升阻比优于圆柱尾部。攻角变化对底部流场结构影
2、响显著。飞行器的升力系数、阻力系数、升阻比及俯仰力矩系数,随攻角增加而增大。随马赫数增加,飞行器头部压力升高,底部压力降低,导致总阻力、底部阻力增大,然而,由于动压增大,使得相应的总阻力系数及底阻系数随之减小。计算分析为飞行器底部设计和优化提供了参考。关键词:底部流动;超声速飞行器;阻力特性中图分类号:V211.3文献标识码:BResearchonDragCharacteristicsofSupersonicVehicleInnuencedbyDi置
3、ferentBaseFlowsWANGWen-long,LIHua,LIUFeng
4、,PANSha(CoHegeofAerospaceScienceandEngineering,NationalUniversityofDefenseTechnology,ChangshaHuan410073,China)ABSTRACT:Inordertostudythedragcharacteristicsofsupersonicvehicleinfluencedbybaseflows,threedimen·sionalReynolds—averagedNavier-Stokesequationsaresolvedusingthe
5、Ausm+一upscheme,combinedbyMUSCLmethod,andchose鼬一sSTturbuleflcemodel.Firstofall。thenumericalmet}lodshavebeenvalidatedbybenchmarkcaseswithexperimentdata,thennumericalsimulationshavebeendowntoclassicsupersonicvehiclewithcylinderbaseandbeattailbase,threefactorsinfluencedaer
6、odynamiccharacteristicsareanalyzed,suchastheeffectofdiffer-entbaseconfiguration,attackangleandmachnumber.Theresultsshowthat:attackanglehasanotableinfluenceonthebaseflowstructures.Withvariationsofattackangle,thebaserecirculationzonedevelopedfromaxialsymmetrytoasymmetric
7、andthewakeleantowindward.theaerodynamiccoefficient,includebasedragcoefficient,totaldragcoef-ficientandpitchingmomentcoefficientwouldincreaseastheattackangleincreasing;Theboattailbasedesigncande—creasedragandthelift-dragratioissuperiortocylinderbase.Alongwiththegrowthof
8、machnumber,thebaserecir-culationandaveragedpressurewilldecrease,whichleadtotheincreaseoftotaldragandbasedrag.However,be—causeofthedynamicpressureincreaseinsquaregrowth,thecorrespondingtotaldragcoefficientandbasedragcoeffi-cientwilldecreaseasmachnumbergrow.KEYWORDS:Base
9、flow;Supersonicvehicle;Dragcharacteristics1引言飞行器阻力特性是飞行器设计中的关键参数之一,一般由波阻、摩阻和底阻构成,而底阻又主导了其它阻力⋯。底部流动现象复杂,包含膨胀波、自由剪切层、分离
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