滑移流区化学非平衡流中气动热环境的数值模拟  

Numerical simulation of aero-heating in slip flow regime with chemical non-equilibrium

作　　者：刘重晓 王江峰[1] LIU Chongxiao;WANG Jiangfeng(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空学院,南京210016

出　　处：《航空学报》2023年第16期101-114,共14页Acta Aeronautica et Astronautica Sinica

基　　金：江苏高校优势学科建设工程(PAPD)。

摘　　要：针对滑移流区化学非平衡流中的气动热环境预测问题,采用多组分化学非平衡纳维-斯托克斯(N-S)方程对轨道验证飞行器(OREX)进行数值模拟,对比了有限催化和非催化、滑移和无滑移壁面条件下的气动加热,研究了壁面催化和滑移效应对气动热的影响规律,并分析了影响气动热的主要机制。结果表明:壁面催化和滑移效应均会影响流场物理量分布,高度为92.82 km时对激波脱体距离的影响较为明显;随着高度减小,有限催化与非催化壁面间的热流偏差增大,而滑移与无滑移壁面间的热流偏差减小;高度低于92.82 km时有限催化壁面计算得到的驻点热流值与飞行数据吻合较好,偏差均在11%以内;机制分析发现,催化效应对壁面附近的组分分布影响较大,滑移边界条件中的温度跳跃条件对壁面附近的温度分布影响显著。Numerical simulation predicting the aero-heating of chemical non-equilibrium flow in the slip flow regime has been carried out for the Orbital Reentry Experiment(OREX)vehicle by solving multicomponent chemical nonequilibrium Navier-Stokes(N-S)equations.A detailed comparison is made between the finite rate catalytic and noncatalytic,slip and no-slip wall conditions,and the influence of surface catalysis and slip effects on aero-heating is stud⁃ied.The main mechanism affecting aero-heating is also analyzed.The results show that surface catalysis and slip ef⁃fects influence the distribution of flow properties,with a strong impact on the shock stand-off distance at 92.82 km.With the decrease in altitude,the gap of heat flux increases between the finite rate catalytic and non-catalytic wall con⁃ditions,while decreases between the slip and no-slip wall conditions.At an altitude lower than 92.82 km,the stagna⁃tion point heat flux of the finite rate catalytic wall agrees well with the flight data,with the deviation within 11%.In the area near the wall,the catalytic effect has a considerable influence on species distribution,while the temperature jump condition of slip effects exerts a significant impact on the temperature distribution.

关 键 词：高超声速 化学非平衡 壁面催化条件 滑移效应 气动热环境 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]