天宫飞行器过渡流区高超声速绕流N-S/DSMC耦合计算  

N-S/DSMC Hybrid Numerical Simulation for Hypersonic Transitional Flow around Disintegrated Objects of Tiangong Vehicle

作　　者：李中华[1] 党雷宁 李志辉[1,2] 李绪国[1] LI Zhonghua;DANG Leining;LI Zhihui;LI Xuguo(Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;National Laboratory for Computational Fluid Dynamics,Beihang University,Beijing 100191,China)

机构地区：[1]中国空气动力研究与发展中心超高速空气动力研究所,绵阳621000 [2]北京航空航天大学北京前沿创新中心国家计算流力学实验室,北京100191

出　　处：《载人航天》2020年第5期543-549,共7页Manned Spaceflight

基　　金：国家重点基础研究发展计划(2014CB744100);国家自然科学基金(11325212);国家数值风洞工程(NNW2018-ZT5B10)。

摘　　要：针对类天宫飞行器服役期满再入大气层多次解体过程残骸碎片绕流对气动特性干扰影响的问题,在数值求解N-S方程的CFD和DSMC方法程序研究基础上,采用MPC耦合处理原理,发展了基于Chapman-Enskog非平衡速度分布函数的耦合区域双向信息交换亚松弛计算技术,建立了适于残骸碎片两体不同间隔绕流干扰流场的N-S/DSMC耦合算法。对天宫飞行器两舱结构体在过渡流区低密度风洞试验状态进行了耦合计算,计算结果与风洞试验结果吻合很好,验证了所建立的耦合算法对再入解体残骸碎片气动特性计算的有效性和可靠性。通过对天宫飞行器解体碎片的简化外形球和球柱体在过渡流区高超声速两体干扰气动特性进行不同间隔绕流场耦合计算分析,结果表明,在一定的距离范围内,两体干扰会对残骸碎片的气动特性产生较强的影响,不同的残骸碎片外形在不同距离的干扰规律不一致。计算结果为天宫飞行器再入解体气动融合轨道数值预报提供设计依据。Considering the interference of debris flow on aerodynamic characteristics during multiple disintegration of Tiangong-type vehicle reentry on expiration of service,the sub relaxation iteration and two-way information exchanging techniques were developed on the basis of the Chapman-Enskog non-equilibrium velocity distribution in the coupling region,and the N-S/DSMC hybrid algorithm was established by employing the principle of the MPC treatment based on the CFD and the DSMC methods.The hybrid simulations were carried out for the experimental cases in hypersonic transitional flow about the two-module configuration of Tiangong vehicle.The good agreement between the present simulations and the related experimental results from the low-density wind tunnel verified the efficient adaptability and reliability of the present N-S/DSMC hybrid algorithm.The aerodynamic characteristics of simplified fragment configurations about spheres and sphere-poles from the disintegrated Tiangong vehicle were simulated in hypersonic transitional interference flow.The results showed that the aerodynamic characteristics of multi-body fragments could be affected by the interference in the range of a definite distance,and the interference laws were different for different fragment configurations.The computed results can provide the design basis for the numerical forecast of the aerodynamics coupling with the orbit of the Tiangong vehicle.

关 键 词：天宫飞行器 空气动力学 过渡流 CFD DSMC 信息交换 耦合算法 多体干扰 

分 类 号：O356[理学—流体力学]