高超声速流动壁面催化复合气动加热特性

针对高超声速流动壁面催化特性，计算了不同壁面催化复合系数条件下的球锥驻点热环境。引入了经验证的数值求解Navier Stokes方程的方法，在不同壁温500K～2500K的条件下分别分析了O 2和N 2气体在壁面处的催化复合气动加热特性，得到如下结论：（1） 原子复合放热将提高近壁面温度梯度，改变近壁面组分分布；原子复合放热一部分加热飞行器形成组分扩散热流，一部分加热近壁气体提高近壁温度梯度。（2） 在壁面催化复合系数较小时，原子复合放热主要转化为组分扩散加热，对于不同壁面温度，壁面催化复合系数α<0.1时，单一气体反应组分扩散热流小于总热流的20%。

Surface Catalysis Recombination Aero-Heating Characteristics of Hypersonic Flow

For the purpose of research on surface catalysis recombination aeroheating of hypersonic flows, surface heating rate at the stagnation point of cone with different recombination coefficients is studied in this article. A validated numerical method is introduced to solve multi species Navier Stokes equations, when the surface temperature varies from 500K to 2500K and the gas focuses on O 2 and N 2. The results show that surface recombination of the atoms will heat the flow near the wall and reconstruct the profile of the mass fraction, and heat released from recombination of the atoms will heat the wall and the mixture near the wall, the energy is transformed into mass diffusion heating mostly when the recombination coefficient is small, and mass diffusion heating rate is below 20% of the total heat flux when recombination coefficient is less than 0.1.