国防科技大学 空天科学学院,长沙,410073
段欣葵(2001—),女,湖南永州人,硕士研究生,研究方向:高温气体动力学. E-mail:duan_xk@163.com
曾明*(1971—),女,湖南娄底人,教授,研究方向:高温气体动力学. E-mail: ming_z@163.com
纸质出版:2024
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段欣葵, 曾明, 王辉, 等. 态-态模型下的CO2系统热非平衡过程数值研究[J]. 空气动力学学报, 2024, 42(6): 66−75. DOI: 10.7638/kqdlxxb-2023.0140
DUAN Xinkui, ZENG Ming, WANG Hui, et al. Numerical study of thermal nonequilibrium process in CO2 system with state-to-state model[J]. 2024, 42(6): 66-75. DOI: 10.7638/kqdlxxb-2023.0140.
以火星大气条件下飞行器非平衡流场研究为背景,采用态-态模型对定容静止CO
2
系统自30 km火星大气条件(181 K)瞬时升温后的热非平衡过程开展数值模拟。考虑CO
2
分子的对称拉伸、弯曲和非对称拉伸三个振动模态共201个振动能级,微观过程包括:振动-平动(VT)能量交换过程引起的同一模态内部的和不同模态间的振动能级跃迁,振动-振动(VV)能量交换过程引起的同一模态内部振动能级跃迁。分析不同振动模态的能级分布演化特点,并考察对应微观过程细节探究内在原因,结果表明:VT过程起支配作用,对由初始低温突然升温后保持定温的气体非平衡过程,VV过程的贡献可以忽略;CO
2
分子的弯曲振动模态具有最快的激发速率,平衡时也具有最高的粒子数占比,升温至
2000
K情况下,对称拉伸和非对称拉伸模态的松弛时间约为弯曲模态的2.2倍和46.1倍;更高温度下振动能级跃迁速率加大,升温至
5000
K情况达到平衡的平均松弛时间比
2000
K情况低了2个量级。
With the background of research on nonequilibrium flow field outside Mars probe
the thermal nonequilibrium process after temperature increase of a stationary CO
2
system from Martian atmospheric condition at an altitude of 30 km (181 K) is studied with state-to-state model. The system with initial condition of Martian atmosphere is heated suddenly to a high temperat
ure and then is kept at constant temperature and volume. Three vibrational modes (symmetric stretching
bending and asymmetric stretching modes) and totally 201 vibrational energy levels are considered. The microscopic processes include: vibration-translation (VT) energy exchange processes that cause transitions between energy levels of the same or different modes
vibration-vibration (VV) energy exchange processes that cause transitions within the same mode. The time evolution of vibrational distribution for the three modes and the specifics of the corresponding microscopic processes are analyzed. The results show that: (1) VT processes are dominant
the contribution of VV processes can be ignored for such sudden increase and then constant temperature case. (2) Among the three vibrational modes
the bending mode has the fastest excitation rate and the largest equilibrium population. For the case of temperature rise to
2000
K
the relaxation time for the symmetric and asymmetric stretching modes is respectively about 2.2 times and 46.1 times of that for the bending mode. (3) As the transition rates increase with temperature
the average relaxation time for
5000
K case is lower than that for
2000
K by two orders of magnitude.
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