| 双锥/双楔流动中的高温气体效应仿真模拟 |
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| 作者姓名： | 袁军娅 任翔 蔡国飙 王伟宗 贺碧蛟 |
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| 作者单位： | 北京航空航天大学宇航学院, 北京 100191 |
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| 摘 要： | 在高超声速飞行和再入地球大气过程中, 气体分子的振动、电子态激发, 伴随离解、电离反应, 从而产生高温真实气体效应。不同数值方法对高温真实气体效应的模化会造成气体热物性参数的差异, 从而对流场模拟引入不确定度。以高超声速的双锥/双楔流动为例, 通过计算流体力学方法和直接模拟Monte Carlo (DSMC)方法, 研究高温真实气体模型对复杂干扰流动的预测能力。结果表明, 有别于量热完全气体, 若考虑真实物理过程的热化学非平衡过程带来气体热力学性质、输运特性的变化, 会导致激波角、边界层厚度、分离区尺寸等流动结构的改变。因此, 在研究高超声速模拟中应注意数值模型的正确应用。
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| 关 键 词： | 高超声速流动 高温真实气体效应 振动松弛 双楔流动 |
| 收稿时间： | 2021-04-11 |
Simulation of High Temperature Gas Effects in High Enthalpy Double Cone/Wedge Flows |
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| Affiliation: | School of Astronautics, Beihang University, Beijing 100191, China |
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| Abstract: | During hypersonic flight and Earth re-entry, vibrational dynamics of gas molecules, electronic state excitation, and dissociation and ionization reactions can cause high temperature real gas effects. The modelling of high-temperature real gas effects by different numerical methods can cause differences in the thermal physical parameters of the gas and thus introduce uncertainties into the flow field simulations. The ability of high-temperature real gas models to predict complex interference flows was investigated by computational fluid dynamics (CFD) and direct simulation Monte Carlo (DSMC) methods, using the example of double cone/wedge flows at high supersonic velocities. The results show that, unlike a calorically perfect gas, the thermochemical non-equilibrium process brings about changes in the thermodynamic properties and transport characteristics of the gas when real physical processes are considered. It also leads to changes in the flow structures such as shock angle, boundary layer thickness and separation zone dimensions. Therefore, attention should be paid to the correct application of numerical models in the study of hypersonic simulations. |
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