), 董威1, 杜雁霞2 1.上海交通大学 机械与动力工程学院, 上海 200240
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
收稿日期:2020-09-07出版日期:2021-11-28发布日期:2021-12-03通讯作者:杨肖峰E-mail:xiaofeng.yang@cardc.cn作者简介:李 芹(1995-),女,山东省淄博市人,硕士生,从事高超声速飞行器表面催化效应研究.基金资助:国家自然科学基金(11702311);国家数值风洞项目(NNW2018-ZT2B04);国家重点研发计划项目(2019YFA0405202)Numerical Simulation of Influence of Adsorption on Surface Heterogeneous Catalysis Process of Hypersonic Vehicles
LI Qin1,2, YANG Xiaofeng2(), DONG Wei1, DU Yanxia2 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan, China
Received:2020-09-07Online:2021-11-28Published:2021-12-03Contact:YANG Xiaofeng E-mail:xiaofeng.yang@cardc.cn摘要/Abstract
摘要： 针对表面催化效应对高超声速飞行器气动热影响显著且难以准确预测的问题,采用理论分析和数值模拟相结合的方法,建立了含物理/化学吸附、Eley-Rideal(ER)和Langmuir-Hinshelwood(LH)复合的有限速率四步表面多相催化模型.基于该模型进行了高超声速圆柱绕流数值模拟,分析了物理和化学吸附位覆盖率对高焓空气流场表面催化反应速率和气动热的影响.结果表明:所发展的催化模型可有效提升气动热预测精准度;受各吸附、复合反应过程的交叉影响,表面覆盖率对气动热的影响是非线性的.所建模型基于真实的物理过程,能够反映材料催化属性的差异,可为高超声速飞行器热防护系统的轻量化、低冗余设计提供理论支撑.
关键词: 表面催化反应, 化学非平衡, 物理吸附, 气动热, 高超声速, 界面物理
Abstract: In view of the issue that surface catalysis has a significant influence on aerodynamic heating of hypersonic vehicle heatshield and is difficult to accurately predict, a four-step surface heterogeneous catalytic model including physisorption, chemisorption, Eley-Rideal (ER) recombination, and Langmuir-Hinshelwood (LH) recombination was established by combining theoretical analysis and numerical simulation. Based on the model, the nonequilibrium flow and the aerodynamic heat around a two-dimensional cylinder were simulated. The influence of the fraction of occupied physisorption and chemisorption sites on the catalysis rate and the aerodynamic heat was analyzed. The results show that the established model can improve the prediction accuracy of the aerodynamic heat. The surface adsorption has a nonlinear influence on the aerodynamic heat due to the competing and promoting between different reaction pathways. Based on the real physicochemical process, the model can reflect the catalytic properties of different materials and further provides theoretical support for the lightweight and low redundancy design of the thermal protection system.
Key words: surface catalysis, chemical nonequilibrium, physisorption, aerodynamic heat, hypersonic, interface physics
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