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首页> 外文期刊>International Journal of Heat and Mass Transfer >Protection of pyrolysis gases combustion against charring materials' surface ablation
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Protection of pyrolysis gases combustion against charring materials' surface ablation

机译：保护热解气体燃烧以防止炭化材料表面烧蚀

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摘要

Charring ablation materials are widely used for thermal protection systems in a vehicle during hypersonic reentry. The pyrolysis gases from the charring materials can react with oxygen in the boundary layer, which makes the surface ablation rate decrease. The problem of protection of pyrolysis gases combustion against charring materials' surface ablation is solved by the detached normal shock wave relations and the counterflow diffusion flame model. The central difference format for the diffusion term and the upwind scheme for the convection term are used to discretize the mathematical model of the counterflow diffusion flame. Numerical results indicate that the combustion of pyrolysis gases in the boundary layer can completely protect the materials surface from recession when the velocity of pyrolysis gases injecting to the boundary layer is higher than the critical velocity. There is an allometric relationship between the critical velocity and Mach number, and the combustion heat has little influence on the temperature distribution originating from the aerodynamic heating. This study will be helpful for the design of the thermal protection system in hypersonic reentry vehicles.
机译：炭化烧蚀材料被广泛用于高超声速折返过程中的车辆热保护系统。炭化材料产生的热解气体会与边界层中的氧气发生反应，从而使表面烧蚀率降低。通过分离的法向冲击波关系和逆流扩散火焰模型解决了保护热解气体燃烧以防止炭化材料表面烧蚀的问题。扩散项的中心差分格式和对流项的迎风方案用于离散逆流扩散火焰的数学模型。数值结果表明，当注入边界层的热解气体的速度高于临界速度时，边界层中的热解气体的燃烧可以完全保护材料表面免受后退的影响。临界速度和马赫数之间存在异形关系，燃烧热对源自空气动力加热的温度分布影响很小。该研究将为高超声速再入飞行器的热保护系统设计提供帮助。

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