航空学报 > 2022, Vol. 43 Issue (1): 124877-124877   doi: 10.7527/S1000-6893.2020.24877

高温化学非平衡湍流边界层直接数值模拟

刘朋欣1,2, 袁先旭1,2, 孙东1,2, 傅亚陆1,2, 李辰1,2   

  1. 1. 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, 绵阳 621000;
    2. 中国空气动力研究与发展中心 计算空气动力研究所, 绵阳 621000
  • 收稿日期:2020-10-15 修回日期:2020-11-16 出版日期:2022-01-15 发布日期:2022-02-14
  • 通讯作者: 李辰 E-mail:lichen@skla.cardc.cn
  • 基金资助:
    国家重点研发计划(2019YFA0405201);国家数值风洞工程

Direct numerical simulation of high-temperature turbulent boundary layer with chemical nonequilibrium

LIU Pengxin1,2, YUAN Xianxu1,2, SUN Dong1,2, FU Yalu1,2, LI Chen1,2   

  1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2020-10-15 Revised:2020-11-16 Online:2022-01-15 Published:2022-02-14
  • Supported by:
    National Key R & D Program of China (2019YFA0405201); National Numerical Windtunnel Project

摘要: 高超声速飞行器在特定工况下飞行时,其表面会存在湍流与化学非平衡耦合作用,但考虑化学反应的高温湍流边界层的研究工作还十分有限。选取高超声速楔形体头部斜激波后的流动状态,分别采用热完全气体模型、空气化学反应模型开展直接数值模拟(DNS)研究,对比分析了化学非平衡效应对湍流统计量、湍流脉动量的影响趋势,并研究了高温湍流边界层标度律。计算结果表明,以吸热离解反应为主的化学非平衡效应会使边界层平均温度和脉动温度显著降低,但对平均速度剖面、速度脉动、雷诺应力的影响较小;在高温化学非平衡湍流边界层的对数区,各流动参数的拓展自相似理论的相对标度指数基本符合标度律。

关键词: 高超声速流动, 高温, 化学非平衡, 湍流边界层, 直接数值模拟, 标度律

Abstract: Under specific flying conditions, interaction between turbulence and chemical nonequilibrium will occur on hypersonic vehicle surfaces; however, related research is limited. Choosing the flow state after the leading shock of a cone and utilizing two gas models, i.e. the calorically perfect gas and the chemical reaction gas, we conduct a Direct Numerical Simulation (DNS) study to analyze the effects of chemical nonequilibrium on the turbulence statistics and fluctuations, and investigate the scaling law. The results show that the endothermic dissociated reaction is dominant in the boundary layer, significantly reducing the average temperature and temperature fluctuation. However, chemical nonequilibrium only have a small influence on the average streamwise velocity, velocity fluctuation and Reynold stress. In the log-region, the Extended Self-Similarity(ESS) of the fluctuations is still consistent with the scaling law.

Key words: hypersonic flow, high-temperature, chemical nonequilibrium, turbulent boundary layer, DNS, scaling law

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