A quasi-one-dimensional model for hypersonic reactive flow along the stagnation streamline
查看参考文献20篇
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文摘
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This study proposes a quasi-one-dimensional model to predict the chemical nonequilibrium flow along the stagnation streamline of hypersonic flow past a blunt body. The model solves reduced equations along the stagnation streamline and predicts nearly identical results as the numerical solution of the full-field Navier-Stokes equations. The high efficiency of this model makes it useful to investigate the overall quantitative behavior of related physical-chemical phenomena. In this paper two important properties of hypersonic flow, shock stand-off distance and oxygen dissociation, are studied using the quasi-one-dimensional model with the ideal dissociating gas model. It is found that the shock stand-off distance is affected by both chemical and thermal non-equilibrium. The shock stand-off distance will increase when the flow conditions are changed from equilibrium to non-equilibrium, because the average density of the shock-compressed gas will decrease as a result of the increase in translational energy. For oxygen dissociation, the maximum value of its dissociation degree along the stagnation line varies with the flight altitude. It is increased at first and decreased thereafter with the altitude, which is due to the combination effect of the equilibrium shift and chemical non-equilibrium relaxation. The overall variation of the maximum dissociation is then plotted in the speed and altitude coordinates as a reference for engineering application. |
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来源
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Chinese Journal of Aeronautics
,2016,29(6):1517-1526 【核心库】
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DOI
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10.1016/j.cja.2016.09.004
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关键词
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Quasi-one-dimensional model
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Hypersonic
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Non-equilibrium
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Stagnation flow
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Shock stand-off distance
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地址
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Institute of Mechanics, Chinese Academy of Sciences, State Key Laboratory of High Temperature Gas Dynamics, Beijing, 100190
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1000-9361 |
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学科
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航空 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5884786
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