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DSMC MODELING OF RAREFIED AERODYNAMIC FEATURES FOR LUNAR EXPLORATION RE-ENTRY VEHICLE

机译：用于月球探测再入车辆的稀有气动特性的DSMC建模

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As the Lunar exploration re-entry vehicle returns to the atmosphere, it experiences violent thermo-chemical nonequilibrium phenomenon and causes important impact on its aerodynamic features. The ground test facilities can hardly simulate the real gas effects in the low density circumstance and expense costly. The aerothermodynamics and flow structures of Chinese Shenzhou like capsule are numerically simulated under different re-entry speeds, using the direct simulation Monte Carlo (DSMC) method. A hybrid grid structure of Cartesian coordinate meshes and surface unstructured triangular cells is adopted. More precise collision and sampling cells during the self-adaption procedure based on local flow gradient variation are used to improve the spatial precision. Temperature dependence of rotational and vibrational collision numbers with Larsen-Borgnakke energy exchange model and Total Collision Energy (TCE) chemistry model are included. Parallel DSMC code is developed based on the static random load balance technique using MPI message passing scheme for communication between processors. Results show that the rarefied gas effect has great impact on the lift-drag ratio and trim characteristics, and the high temperature real gas effect affects the surface thermal environment. significantly. Moreover, at the Lunar return velocity, strong dissociation reactions occur in rarefied conditions at 100km.
机译：当“月球”探空飞行器返回大气层时，会经历剧烈的热化学不平衡现象，并对其空气动力特性产生重要影响。地面测试设备很难在低密度环境下模拟真实的瓦斯效应，而且费用昂贵。采用直接模拟蒙特卡罗（DSMC）方法，对神州样胶囊的空气动力学和流动结构在不同的再入速度下进行了数值模拟。采用直角坐标网格和表面非结构三角形单元的混合网格结构。在基于局部流量梯度变化的自适应过程中，更精确的碰撞和采样单元用于提高空间精度。包括旋转和振动碰撞数与温度的相关性，包括Larsen-Borgnakke能量交换模型和总碰撞能量（TCE）化学模型。并行DSMC代码是基于静态随机负载平衡技术开发的，该技术使用MPI消息传递方案在处理器之间进行通信。结果表明，稀薄气体效应对升阻比和修整特性有很大影响，而高温真实气体效应会影响表面热环境。显着地。此外，在月球返回速度下，在稀疏条件下100km处会发生强烈的离解反应。

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