空天飞行器时变热流载荷多阶段反演方法研究  

Research on Multi-Stage Identification Method for the Time-Varying Heat Flux Load of Aerospace Vehicle

作　　者：陈强 刘子昂 李彦斌[1,2] 陆方舟 费庆国 CHEN Qiang;LIU Ziang;LI Yanbin;LU Fangzhou;FEI Qingguo;无(School of Mechanical Engineering,Southeast University,Nanjing 211189,China;Engineering Research Center of Aerospace Machinery,Southeast University,Nanjing 211189,China;Chengdu Aircraft Design&Research Institute,Chengdu 610091,China)

机构地区：[1]东南大学机械工程学院,南京211189 [2]江苏省空天机械装备工程研究中心,南京211189 [3]成都飞机设计研究所,成都610091

出　　处：《工程热物理学报》2023年第7期1873-1880,共8页Journal of Engineering Thermophysics

基　　金：国家杰出青年科学基金(No.52125209);江苏省博士后科研资助计划(No.2021K230B);国家自然科学基金(No.52175220);江苏省自然科学基金(No.BK20211558);东南大学“仲英青年学者”资助项目。

摘　　要：为准确掌握可重复使用空天飞行器服役时面临的气动加热载荷,本文发展了一种基于改进共轭梯度理论的时变热流载荷多阶段反演方法。以一体化热防护结构开展数值仿真研究,分析了灵敏度分析方法、多阶段反演次数、温度测量误差等因素对反演精度和效率的影响规律。研究结果表明:通过将复变量求导引入至共轭梯度法中,可以在保障反演精度前提下减少超过30%的迭代次数;采用多阶段反演方法使得热流载荷总体反演偏差降低20%以上,而增加的计算时间小于10%;在适当收敛准则下,所发展的多阶段反演方法具有较好抗噪性能。Aiming at accurately identifying the aerodynamic heating loads faced by reusable aerospace vehicles under service,a novel multi-stage identification method of time-varying heat flux loads based on a modified conjugate gradient method is proposed in this paper.Numerical research is carried out with an integrated thermal protection structure.The influence of the sensitivity analysis method,number of identification stages,and temperature measurement error on the accuracy and efficiency of the proposed identification method is analyzed.Research results indicate that,by introducing the complex-variable-differentiation method into the conjugate gradient method,the number of iterations can be reduced by more than 30%under the premise of ensuring identification accuracy.By using the proposed multi-stage identification method,the identification deviation of heat flux load can be reduced by more than 20%,but the increased calculation time is less than 10%.The proposed multi-stage identification method has good anti-noise performance under the appropriate convergence criterion.

关 键 词：空天飞行器 共轭梯度法 复变量求导法 热防护结构 传热学反问题 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]