基于多层分块算法的激波干扰流场预测  

PREDICTION OF SHOCK INTERFERENCE FLOW FIELD STRUCTURE BASED ON THE MULTI-LEVEL BLOCK BUILDING ALGORITHM

作　　者：李帅 彭俊 罗长童 胡宗民[1,2] Li Shuai;Peng Jun;Luo Changtong;Hu Zongmin(LHD,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;The System Design Institute of Mechanical-Electrical Engineering,Beijing 100854,China)

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]北京机电工程总体设计部,北京100854

出　　处：《力学学报》2021年第12期3284-3297,共14页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金资助项目(12072353)。

摘　　要：激波-激波干扰流场预测是超声速乃至高超声速流动中最具挑战性的问题之一.特别地,第Ⅳ类激波干扰由于其在壁面驻点附近产生极高的热载荷而备受关注.本文针对圆柱诱导的弓形激波和入射斜激波的干扰问题,分别基于量热完全气体模型和考虑振动激发的热完全气体模型,数值求解有黏二维可压缩NS方程,分析了高温气体效应对激波干扰流场结构,以及第Ⅳ类激波干扰流场状态参数的影响.接着,本文基于一种具有广义可分离特性的遗传算法(多层分块算法),给出能够预测不同气体模型下第Ⅳ类激波干扰流场三波点的坐标位置、超声速射流的几何形状等特征性几何结构的数学模型,进一步获得高温气体效应对激波干扰类型转变准则影响的定量化评估.激波干扰类型转变准则面上的多组临界工况的激波干扰流场结构以及壁面压力和壁面热流分布的对比结果表明,不同气体模型下的激波干扰类型和流场结构差异较为显著,获得的定量化预测模型对工程中气动热环境的预测具有一定的参考价值.Shock-shock interference flow flied prediction is one of the most challenging problems in supersonic flow and even hypersonic flow.In particular,type IV shock interference has attracted more and more attention due to the extremely high thermal loads it generates in the vicinity of stagnation point.In this paper,we analyze meticulously the effect of high temperature gas effects on the geometric structure of the shock interference and the flow field parameters,especially of the type IV shock interference,based on the calorimetric perfect gas model and the thermal perfect gas model considering only vibration excitation,respectively,by numerically solving the viscous two-dimensional compressible Navier-Stokes equations for the cylindrical-induced bow shock wave and oblique shock wave interference problems.With the increase of free stream Mach number,the effect of high-temperature gas is gradually significant.And then,based on a new genetic algorithm with generalized separability(multi-level block building algorithm),mathematical models that can predict the characteristic geometric structures such as the location of the triple wave point and the geometry of the supersonic jet in the type IV interference under different gas models are presented to obtain a quantitative assessment of the effect of high temperature gas effects on the transition criterion for the type of interference for thermal protection work.The comparison results of the radical interference structure and wall pressure and wall heat flux distribution for multiple sets of critical conditions on the transition criterion surface show that the interference types and flow field structures under different gas models differ significantly,and the obtained quantitative prediction model has certain reference value for the prediction of aerodynamic thermal environment in practical engineering applications.In the end,multiple sets of critical working conditions on the transition criterion surfaces are used to prove it,revealing the engineering significance of the

关 键 词：激波干扰 高温气体效应 多层分块算法 高超声速流动 气动热 

分 类 号：V211.14[航空宇航科学与技术—航空宇航推进理论与工程]