原子氧和石墨在近地轨道环境中反应概率的数值估算  

A NUMERICAL EVALUATION OF REACTIVE PROBABILITIES OF ATOMIC OXYGEN WITH GRAPHITE IN LOW EARTH ORBIT

作　　者：陈来文[1] 李椿萱[1] 

机构地区：[1]北京航空航天大学飞行器设计和应用力学系,北京.100083

出　　处：《宇航学报》2000年第2期64-69,共6页Journal of Astronautics

基　　金：国家自然科学基金

摘　　要：本文提出估算近地轨道环境中原子氧对高度规则材料的反应概率的分子动力学模型。该模型通过对所导出的随机微分方程组的数值求解估算出原子氧与材料表面相互作用的经典轨迹系统 ,并根据所提出的反应性与非反应性碰撞准则估算出相互作用的反应概率。作为算例 ,本文给出了原子氧与石墨材料表面的反应概率数值计算结果 ,并与航天飞机 STS- 46所测出的实际反应概率进行了对比 。A theoretical model based on the theory of molecular dynamics for evaluating the reactive probabilities of the atomic oxygen and highly organized materials in low earth orbit(LEO) is proposed in the present paper.The model is constructed to compute the classical trajectory ensembles by solving a system of stochastic differential equations,and the reactive probabilities can then be evaluated in accordance with the criteria proposed in this work for reactive and non reactive collisions.The computed reactive probabilities for atomic oxygen interacting with graphite are presented as a test case,and are compared with flight test data from STS 46.It demonstrates that the model constructed in the present work is reliable to some extent.

关 键 词：原子氧 石墨 反应概率 近地轨道 飞行实验 

分 类 号：V419.3[航空宇航科学与技术—航空宇航推进理论与工程] O613.71[理学—无机化学]