| 均匀气体中内自由度激发松弛与离解反应的直接统计模拟 |
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| 引用本文： | 沈青,吴万泉,胡振华,徐晓燕.均匀气体中内自由度激发松弛与离解反应的直接统计模拟[J].空气动力学学报,1991(1). |
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| 作者姓名： | 沈青 吴万泉 胡振华 徐晓燕 |
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| 作者单位： | 中国科学院力学所
(沈青)，航空航天部二○七所
(吴万泉，胡振华)，航空航天部二○七所(徐晓燕) |
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| 基金项目： | 中国自然科学基金 928801-6 |
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| 摘 要： | 空间均匀气体内自由度的激发松弛及离解反应,用直接模拟蒙特卡罗方法进行了数值模拟。为模拟非弹性碰撞,采用与变径刚球模型(VHS)相结合的Larsen-Borgnakke模型。振动能与转动能分别考虑,为此发展了一种对有奇异性的分布的取样法,即积累分布-取舍联合法。确定了与实验松弛时间相符的非弹性碰撞数Z_V,Z_R,得到了有转动、振动激发耦合的离解反应的满意的直接模拟。
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| 关 键 词： | 内自由度激发 离解反应 直接模拟蒙特卡罗方法 |
DIRECT STATISTICAL SIMULATION OF THE EXCITATION OF INTERNAL DEGREES OF FREEDOM AND THE DISSOCIATION REACTION IN A HOMOGENEOUS GAS |
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| Shen Qing.DIRECT STATISTICAL SIMULATION OF THE EXCITATION OF INTERNAL DEGREES OF FREEDOM AND THE DISSOCIATION REACTION IN A HOMOGENEOUS GAS[J].Acta Aerodynamica Sinica,1991(1). |
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| Authors: | Shen Qing |
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| Institution: | Shen Qing(Institute of Mechanics Chinese Academy of Sciences) W u Wanquan Hu Zhenhua Xu Xiaoyan (Institute of Environmental Features) |
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| Abstract: | The excitation of internal degrees of freedom and the dissociation in a spacially homogeneous gas is studied by using the dirct simulation Monte-Carlo method . The inelastic collisions are simated by the Larsen-Borgnakke phenomenological model incorporated with the variable hard sphere model. The vibrational relaxation is considered separately from the rotational relaxation and a generalized acceptance-rejection method is suggested to realize the sampling according to the singular distributions. The inelastic collision numbers are determined in accordance with the relaxation times obtained experimentally, a satisfactory simulation for the dissociation coupled with rotational and vibrational excitation is realized. |
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| Keywords: | excitation of internal degrees of freedom dissociation direct simulation Monte-Carlo method |
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