Owing to its superior chemical stability at high temperatures, carbon is attractive as a candidate for ablation thermal protection system (TPS) materials for hypersonic re-entry vehicles. The catalytic recombination behavior is crucial to the ablation process during atmospheric entry because it provokes considerable heat flux at the surface. In the present study, catalytic efficiency values for oxygen and nitrogen recombination on carbon material have been determined by reflected shock experiments that can replicate the flow behavior of a hypersonic stagnation-point blunt body. Dissociated oxygen and nitrogen atoms were adequately produced adjacent to the shock tube endwall. Typical thin-film gauges coated with carbon are used for the stagnation heat-transfer measurements at the endwall. Before and after the tests, the properties of carbon were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Surface heat-transfer data were analysed with catalytic heat-transfer theories. The role of recombination efficiency on the species mass fraction is also investigated by solving the governing equation for species conservation. The recombination efficiencies of carbon are found to be 0.0023 and 0.00075 for oxygen and nitrogen, respectively. It has been shown that the carbon surface is more catalytically active towards oxygen atoms than nitrogen atoms.

由于其在高温下的出色化学稳定性，碳作为高超声速再入飞行器的烧蚀热防护系统（TPS）材料的候选材料具有吸引力。催化复合行为对大气进入过程中的烧蚀过程至关重要，因为它在表面上会引起相当大的热通量。在本研究中，通过反射冲击实验可以确定碳材料上氧和氮重组的催化效率值，该实验可以复制高超音速驻点钝体的流动行为。离激波管端壁足够远地产生离解的氧和氮原子。典型的涂有碳的薄膜液位计用于端壁处的停滞传热测量。测试前后 通过扫描电子显微镜（SEM），原子力显微镜（AFM）和X射线光电子能谱（XPS）研究了碳的性质。利用催化传热理论分析了表面传热数据。还通过求解物种保护的控制方程，研究了重组效率对物种质量分数的作用。发现碳对于氧和氮的重组效率分别为0.0023和0.00075。已经表明，碳表面对氧原子比对氮原子更具催化活性。还通过求解物种保护的控制方程，研究了重组效率对物种质量分数的作用。发现碳对于氧和氮的重组效率分别为0.0023和0.00075。已经表明，碳表面对氧原子比对氮原子更具催化活性。还通过求解物种保护的控制方程，研究了重组效率对物种质量分数的作用。发现碳对于氧和氮的重组效率分别为0.0023和0.00075。已经表明，碳表面对氧原子比对氮原子更具催化活性。