北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (11): 2364-2372.doi: 10.13700/j.bh.1001-5965.2018.0079

• 论文 • 上一篇    下一篇

电离对高超声速热化学非平衡气动热环境的影响

杨建龙, 刘猛   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100083
  • 收稿日期:2018-02-08 修回日期:2018-05-04 出版日期:2018-11-20 发布日期:2018-11-27
  • 通讯作者: 刘猛,E-mail:liumeng@buaa.edu.cn E-mail:liumeng@buaa.edu.cn
  • 作者简介:杨建龙,男,博士研究生。主要研究方向:高超声速飞行器气动力/热数值计算、结构热防护设计、流-固-热耦合;刘猛,男,博士,教授,硕士生导师。主要研究方向:飞行器环境控制、结构热防护设计。

Influence of ionization on hypersonic thermo-chemical non-equilibrium aerodynamic thermal environments

YANG Jianlong, LIU Meng   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2018-02-08 Revised:2018-05-04 Online:2018-11-20 Published:2018-11-27

摘要: 高超声速飞行,激波后高温气体会发生电离,飞行器气动热环境复杂。5组元(N2,O2,NO,O,N)、7组元(N2,O2,NO,O,N,NO+,e-)和11组元(N2,O2,NO,O,N,N2+,O2+,NO+,O+,N+,e-)热化学反应采用Gupta化学反应模型,分别数值研究电离作用对高超声速热化学非平衡气动热环境影响。本文分析了不同催化壁面条件下,高超声速热化学非平衡电离流场气动热环境特性。电离作用对激波离体距离和气动力载荷的影响很小。5组元热化学非平衡不考虑电离作用,流场温度和壁面热流密度偏大。11组元热化学平衡强电离流场温度最低;7组元热化学非平衡弱电离流场NO+和e-生成量过低;11组元热化学反应能对热化学非平衡电离流场气动力和热流密度载荷可靠预测。壁面催化作用会增大壁面热流密度,但它对高超声速热化学非平衡电离流场温度和气动力载荷的影响很小。

关键词: 高超声速, 电离, 热化学非平衡, 气动热环境, 催化壁面

Abstract: The high temperature gas after shock wave occurs to ionize in hypersonic flight, which makes the aerodynamic thermal environments to be complicated. The 5 species (N2, O2, NO, O, N), 7 species (N2, O2, NO, O, N, NO+, e-) and 11 species (N2, O2, NO, O, N, N2+, O2+, NO+, O+, N+, e-) thermo-chemical reactions of Gupta's chemical reaction model were taken to numerically study the influence of ionization on hypersonic thermo-chemical non-equilibrium aerodynamic thermal environments, respectively. The characteristics of hypersonic thermo-chemical non-equilibrium ionization flow field aerodynamic thermal environments in different catalytic wall conditions were also researched. The effect of ionization on the shock standoff distance and the aerodynamic force load is very small. The flow filed temperature and the wall heat flux calculated by 5 species thermo-chemical non-equilibrium reactions are much bigger because the effect of ionization is not considered. The hypersonic strong ionization flow field temperature calculated by 11 species thermo-chemical equilibrium reactions is the lowest. The amounts of NO+ and e- in hypersonic weak ionization flow field calculated by 7 species thermo-chemical non-equilibrium reactions are too small. The aerodynamic force and the wall heat flux loads in hypersonic thermo-chemical non-equilibrium ionization flow field can be effectively predicted by 11 species thermo-chemical reactions. The wall heat flux increases when the effect of wall catalysis is considered. However, the temperature of hypersonic thermo-chemical non-equilibrium ionization flow field and the aerodynamic force load are less affected by the wall catalysis.

Key words: hypersonic, ionize, thermo-chemical non-equilibrium, aerodynamic thermal environment, catalytic wall

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