| 引用本文: | 杨肖峰,桂业伟,邱波,等.高焓CO2气流壁面两步催化机制对非平衡气动加热影响的数值模拟.[J].国防科技大学学报,2020,42(1):108-116.[点击复制] |
| YANG Xiaofeng,GUI Yewei,QIU Bo,et al.Numerical investigation on influence of surface two-step catalytic mechanism on non-equilibrium aerodynamic heating for high-enthalpy CO2 flow[J].Journal of National University of Defense Technology,2020,42(1):108-116[点击复制] |
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| 高焓CO2气流壁面两步催化机制对非平衡气动加热影响的数值模拟 |
| 杨肖峰1,2,桂业伟2,邱波2,杜雁霞2,肖光明2 |
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(1. 国防科技大学 空天科学学院, 湖南 长沙 410073;2. 中国空气动力研究与发展中心 空气动力学国家重点实验室, 四川 绵阳 621000)
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| 摘要: |
| 针对高超声速火星进入飞行遇到的壁面CO2催化机制特殊且对气动加热影响复杂的问题,基于化学反应系统的三维可压缩流动求解器,建立壁面吸附、Eley-Rideal结合速率受控的壁面CO2两步催化模型。基于70°球锥布局的高焓风洞实验,进行考虑壁面催化效应的高超声速非平衡气动加热数值模拟,开展考虑CO+O(s)和O+CO(s)两类CO2两步催化路径对非平衡气动加热的影响研究。研究表明,壁面O2和CO2结合并存且存在相互竞争关系,催化加热量随催化效率增大而单调增加。数值计算建立了催化路径与非平衡加热水平的定量关联,研究发现CO2两类催化路径权重与加热量存在非单调关联,特定权重下两种路径联合作用的热流高于单个催化结果。相关研究对碳氧气体主导的壁面催化机理和火星进入气动加热的精细化预测有重要的理论指导意义。 |
| 关键词: 壁面两步催化 气动加热 化学非平衡 高焓CO2气流 数值模拟 |
| DOI：10.11887/j.cn.202001015 |
| 投稿日期：2018-09-24 |
| 基金项目:国家自然科学基金资助项目(11702311)；博士后创新人才支持计划资助项目(BX20180371) |
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| Numerical investigation on influence of surface two-step catalytic mechanism on non-equilibrium aerodynamic heating for high-enthalpy CO2 flow |
| YANG Xiaofeng1,2, GUI Yewei2, QIU Bo2, DU Yanxia2, XIAO Guangming2 |
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(1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China)
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| Abstract: |
| Surface catalytic mechanism is dominated by CO2 recombination during the hypersonic Mars entries, which will highly influence the aerodynamic heating. The surface CO2 two-step catalytic model was dealt with on the basis of the three-dimensional compressible flow solver for chemical reaction system. The rates of surface chemical reactions were controlled by surface adsorption and Eley-Rideal recombination. The hypersonic flow around the 70° sphere-cone testing model was numerically solved to predict the chemical non-equilibrium aerodynamic heating with surface catalytic effects. The influence of two-step CO2 catalytic mechanism, including two pathways, CO+O(s) and O+CO(s), on the aerodynamic heating was numerically investigated. The recombination of O2 and CO2 coexists and competes with each other. The catalytic heating increases monotonically with the rise of catalytic efficiency. The numerical calculation established a quantitative correlation between the catalytic pathways and the non-equilibrium heating level, and the results show that the relationships between the weight of two CO2 catalytic pathways and the heating capacity are non-monotonic, and the combined aerodynamic heating of two pathways of CO2 recombination is calculated to be higher than the value from single pathway. The current study contributes in several ways to our understanding of carbon-oxygen catalytic mechanism and precise evaluation of aerodynamic heating for Mars entries. |
| Keywords: surface two-step catalysis aerodynamic heating chemical non-equilibrium high-enthalpy CO2 flow numerical simulation |
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