极高速再入飞行器高温非平衡流场与热辐射耦合模拟研究  

Reseach on Coupling Simulation of High-temperature Thermochemical Nonequilibrium Flowfield and Thermal Radiation for Reentry Vehicle at Extremely High Speed

作　　者：杨星链 张诗玥 赵薇 王京盈[1] 孙柯[1] Yang Xinglian;Zhang Shiyue;Zhao Wei;Wang Jingying;Sun Ke(School of Energy and Power Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《气动研究与试验》2024年第1期100-109,共10页Aerodynamic Research & Experiment

基　　金：国家自然科学基金(2002193);航空工业气动院科技创新重点实验室“新风向”联合创新项目(XFX20220102)。

摘　　要：再入飞行器气动热环境准确预测对深空探索和返回任务具有至关重要的意义。本文采用了非灰气体多台阶模型计算高温大气辐射吸收系数,离散坐标法求解辐射传输方程,并与自研高超声速热化学非平衡流场求解器相结合,对FIREⅡ飞行试验算例分别进行了流场与热辐射耦合和非耦合模拟研究,预测的FIREⅡ表面热流与LAURA和DPLR计算结果一致,验证了本文数值方法的可靠性。研究结果表明,该算例工况下流场和热辐射场具有显著的耦合作用:一方面激波层内的辐射能量吸收与发射使得流场非绝热,导致辐射冷却效应,使得温度降低、密度增加,激波层变得更加薄;另一方面辐射耦合影响了大气组分的化学反应过程,而空气组分构成及其热力学状态则直接影响辐射的水平。非耦合与耦合模拟给出的驻点对流热流相差较小,但辐射热流耦合值较非耦合值下降约15%,辐射耦合作用不可忽视。本文的研究可为极高速再入飞行器气动热环境预测和热防护设计提供较好的方法支持和理论参考。Accurate prediction of aerothermal environment of reentry vehicles is of vital importance for deep space exploration and return missions.In this paper,a non-gray gas multi-step model is employed to calculate the radiation absorption coefficient of high-temperature atmosphere,and the discrete coordinate method is used to solve the radiation transfer equation,and combined with the self-developed hypersonic thermochemical non-equilibrium flow field solver,the coupled and non-coupled simulation studies of the flow field and radiation are carried out respectively for the FIRE Il flight test examples.The predicted surface heat flow of FIRE Ilin this paper is consistent with the results of LAURA and DPLR,which verifies the reliability of the numerical method in this paper.The results show that the flow field and thermal radiation field have a significant coupling effect under the example condition.On the one hand,the absorption and emission of radiation energy in the shock layer make the flow field non-adiabatic,resulting in a radiative cooling effect,which reduces the temperature,increases the density and makes the shock layer thinner.On the other hand,radiation coupling affects the chemical reaction process of atmospheric components,and the composition of air components and their thermodynamic states directly affect the level of radiation.The difference between uncoupled and coupled simulations is small,but the coupling value of radiant heat flow is about 15%lower than that of uncoupled.The effect of radiation coupling cannot be ignored.The research in this paper can provide good method support and theoretical reference for aero-thermal environment prediction and thermal protection design of very high speed reentry vehicle.

关 键 词：气动热 再入飞行器 高超声速 热辐射 离散坐标法 

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]