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首页> 外文期刊>Journal of Spacecraft and Rockets >Surface Chemical Effects on Hypersonic Nonequilibrium Aeroheating in Dissociated Carbon-Oxygen Mixture
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Surface Chemical Effects on Hypersonic Nonequilibrium Aeroheating in Dissociated Carbon-Oxygen Mixture

机译：解离的碳氧混合物中高超声速非平衡空气加热的表面化学效应

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摘要

Surface chemical effects have great influence on the prediction of hypersonic nonequilibrium aerodynamic heating, and they are particularly complex in a dissociated carbon-oxygen environment for the possible use of Mars entry simulation. To clearly characterize the thermochemical behaviors and precisely predict the surface heat fluxes, a finite-rate surface chemical model involving the catalysis and ablation effects is developed, and the influences of catalysis, ablation, and their interaction on aerodynamic heating are parametrically discussed in detail. The computation finds that the surface thermochemical characteristics are dominated commonly by surface reactions and near-wall diffusion, depending on the balance of the levels of the chemical-reaction rate and the diffusional transport speed. The findings of this study indicate that both competition and enhancement exist between various surface reaction channels. They will compete for the species if they commonly consume the same reactant, whereas they will mutually enhance their heat fluxes if the product of one reaction channel supplies to the other. The surface chemical effects on aerodynamic heating can make assessments for the search and application of promising and profitable thermal protection materials based on the material catalytic and ablative characteristics in the scope of decreasing the weight of the thermal protection system.
机译：表面化学效应对高超声速非平衡空气动力学加热的预测有很大影响，并且在离解的碳氧环境中，为了可能使用火星进入模拟，它们特别复杂。为了清楚地表征热化学行为并精确预测表面热通量，建立了包含催化和烧蚀效应的有限速率表面化学模型，并详细讨论了催化，烧蚀及其相互作用对气动加热的影响。计算发现，表面热化学特征通常由表面反应和近壁扩散决定，这取决于化学反应速率和扩散传输速度的平衡。这项研究的结果表明，各种表面反应通道之间都存在竞争和增强作用。如果它们通常消耗相同的反应物，它们将竞争该物种，而如果一个反应通道的产物提供给另一反应通道，则它们将相互提高其热通量。在降低热保护系统重量的范围内，基于材料的催化和烧蚀特性，表面化学对空气动力学加热的影响可以评估寻找和应用有前景和有利可图的热保护材料。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2018年第3期|687-697|共11页
  • 作者

    Yang Xiaofeng; Gui Yewei; Tang Wei; Du Yanxia; Wei Dong; Xiao Guangming; Liu Lei;

  • 作者单位

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

    China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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