二维圆柱在高超声速气流中的耦合传热计算

Coupling Calculation of Heat Conduction in 2D Column in Hypersonic Flows

高超声速飞行器热结构和热防护设计离不开对飞行器表面的气动热载荷和固体内温度的准确预测,两者之间的耦合作用对此有着重要影响。开展高超声速流场与结构温度场的耦合数值计算,流场部分求解了二维非定常全N-S方程,空间差分采用Harten-Yee的TVD格式,时间离散采用双时间步推进。固体结构传热部分求解了二维非稳态的热传导方程。通过流固交界面,流体从固体部分得到温度边界条件,固体从流体部分得到热流边界条件,从而实现流场和固体温度场的紧耦合计算。将这套算法成功应用于绕无限长圆柱的气动加热计算中,对圆柱在气动加热过程中的温度变化做了详细的分析。

Design of thermal protection systems for hypersonic reentry vehicles cannot execute without accurate prediction of the aerothermal loads and structural temperatures.Significant coupling occurs between the aerodynamic flow field and structural heat conduction.The coupling calculation of fluid-solid-thermal interaction in hypersonic flows is researched.The unsteady fully N-S equations are solved by Harten-Yee＇s TVD and dual time march for the flow field.The 2D unsteady heat conduction equation is solved for the structure.The coupling is processed as follows： the flow field acquires temperature boundary condition from the structure and the temperature field of the structure acquires heat flux boundary condition from flow at the fluid-solid interface.The method proposed is applied in calculation of aerothermal heating for infinite column.The transformation of column temperature is detailed analyzed during aerothermal heating.