摘要
建立了热防护系统(Thermal protection system,TPS)缝隙气动热分析的计算流体动力学(Computational fluid dynamics,CFD)数值模型,将缝隙热流密度分布情况与平板热流进行了对比,结果表明由于缝隙的存在缝隙上端出现了热流峰值,并且缝隙迎风面热流密度大于背风面热流密度,缝隙热流密度主要集中在缝隙上端与缝隙宽度相当的区域内;采用分析获得的缝隙热流密度建立了缝隙热控分析的有限元传热模型,结果表明缝隙气动热和缝隙类空腔辐射会造成机体表面温度的升高,是造成缝隙热短路现象的原因;最后研究了缝隙几何形状(缝隙宽度、缝隙倒圆角以及缝隙台阶)对缝隙热控性能的影响,分析结果表明随缝隙宽度增加,机体表面最高温度升高。随缝隙倒圆角半径增加,机体表面最高温度降低。随缝隙台阶高度增加,台阶正差时机体表面最高温度升高,台阶逆差时机体表面最高温度降低。
The computational fluid dynamics(CFD)numerical model is established to analyze the aerodynamic heating of gap for thermal protection system.The heat flux distribution of gap is compared with that of plate.Maximum heat flux appear at the upper of gap,and the heat flux on windward side is greater than that on leeward side.The heat flux is concentrated in upper gap that is approximately equal to the width of gap.The FEM heat transfer model for heat control analysis of gap is established based on the heat flux of gap.The aerodynamic heating and cavity radiation of gap result in the increase of temperature of structure,which is the reason of the short circuit phenomenon of gap.Finally,the influences of gap shape on the heat control performance are studied.As the width of gap increases,maximum temperature of structure increases.As the radius of rounded corner increases,maximum temperature of structure decreases.As the height of gap step increases,maximum temperature of structure increases,when the height of windward side is greater than that of leeward side.However maximum temperature of structure decreases when the height of windward side is less than that of leeward side.
作者
黄杰
姚卫星
孔斌
王曼
甘建
杨家勇
HUANG Jie;YAO Weixing;KONG Bin;WANG Man;GAN Jian;YANG Jiayong(AVIC Chengdu Aircraft Design and Research Institute,Chengdu,610019,China;State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics & Astronautics,Nanjing,210016,China;AVIC Chengdu Aircraft Design and Research Institute,Chengdu,610019,China)
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2019年第3期366-373,共8页
Journal of Nanjing University of Aeronautics & Astronautics
基金
江苏高校优势学科建设工程资助项目
博士后创新人才支持计划资助项目
关键词
热防护系统
缝隙热流分布
热控分析
缝隙热短路
缝隙几何形状
thermal protection system
heat flux of gap
heat control analysis
short circuit of the gap
geometrical shape of gap
