基于非线性耦合本构化学反应模型的高空逆向喷流数值模拟  

Numerical simulation of high altitude reverse jet based on nonlinear coupled constitutive chemical-reaction model

作　　者：黄依峰 江中正 曾舒华 陈伟芳[1] HUANG Yifeng;JIANG Zhongzheng;ZENG Shuhua;CHEN Weifang(School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学航空航天学院,杭州310027

出　　处：《航空动力学报》2025年第2期116-128,共13页Journal of Aerospace Power

基　　金：国家自然科学基金(12002306,U20B2007)。

摘　　要：考虑到NS(Navier-Stokes)方程由于连续性假设失效在高空逆向喷流多尺度流动预示中存在的局限性,同时为了准确捕捉逆向喷流与高速来流相互作用后的高温化学反应流场特征以及压力系数变化,运用非线性耦合本构关系(nonlinear coupled constitutive relations,NCCR)理论结合高温化学反应模型对不同稀薄来流高度下的逆向喷流问题进行数值计算,并与NS方程和蒙特卡洛直接模拟(direct simulation of Monte Carlo,DSMC)方法的结果进行对比。模拟的流场结果表明:逆向喷流能够通过形成马赫盘将头部的脱体激波推离物面,并且在其与喷口附近的环形回流低压区的共同作用下达到较为显著的减阻降热效果。此外,通过部分算例与DSMC结果的对比可以看到,在考虑化学反应的滑移/过渡流域逆向喷流计算中NCCR模型预测结果较NS方程的高温结果更为准确,检验了NCCR高温化学反应模型在高空复杂流动情况下的准确性和适用性。Considering the limitation of NS(Navier-Stokes)equation in predicting the multi-scale flow of high-altitude reverse jet due to the failure of continuity assumption,in order to accurately capture the characteristics of high temperature chemical reaction flow field of interaction between reverse jet and high-speed free stream as well as the variation of pressure coefficient,the nonlinear coupled Constitutive relations(NCCR)theory combined with the high temperature chemical reaction model was adopted to numerically calculate the reverse jet flow at different rarefied heights.The results were compared with those obtained by NS equation and direct simulation of Monte Carlo(DSMC).The simulation results showed that the reverse jet can push the detached shock wave away from the object surface by forming a Mach disk,and achieve a significant drag and heat reduction effect under the joint action of the detached shock wave and the annular reflux low-pressure area around the nozzle.In addition,by comparing with part of DSMC results,it can be seen that the prediction results of NCCR model were more accurate than the high temperature results of NS equation in calculating the chemical reverse jet flow in slip/transition regimes,which verified the accuracy and applicability of NCCR high temperature chemical reaction model in complex flow conditions at high altitude.

关 键 词：逆向喷流 TCE化学反应模型 NCCR模型 高超声速流动 直接模拟蒙特卡洛方法 

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]