航天器表面环境散射返回流TPMC模拟

计算物理 ›› 2015, Vol. 32 ›› Issue (5): 529-536.

航天器表面环境散射返回流TPMC模拟

靳旭红, 黄飞, 程晓丽, 王强

中国航天空气动力技术研究院, 北京 100074

收稿日期:2014-09-27 修回日期:2015-02-03 出版日期:2015-09-25 发布日期:2015-09-25
通讯作者: 黄飞(1982-),高级工程师,E-mail:huang05013@163.com
作者简介:靳旭红(1988-),男,硕士研究生,主要从事稀薄气体流动研究,E-mail:jinxuhong08@163.com

Test Particle Monte Carlo Simulation of Return Flux on Spacecraft Surfaces due to Ambient Scatter of Outgassing Molecules

JIN Xuhong, HUANG Fei, CHENG Xiaoli, WANG Qiang

China Academy of Aerospace Aerodynamics, Beijing 100074, China

Received:2014-09-27 Revised:2015-02-03 Online:2015-09-25 Published:2015-09-25

摘要/Abstract

摘要： 介绍试验粒子Monte Carlo(test particle Monte Carlo,TPMC)方法,并采用该方法对4种航天器表面出气分子形成的环境散射返回流进行数值模拟.其中,圆球出气表面的计算结果与已有的DSMC(direct simulation Monte Carlo)结果一致,验证了方法的正确性.此外,对不同出气和来流条件下圆形平板、凸半球和凹半球3种航天器简化表面出气分子形成的环境散射返回流进行计算,结果表明:出气表面外形是影响返回通量比的一个重要因素;圆形平板和凹半球出气表面的返回通量比远大于凸半球表面的;凹半球表面的出气分子会直接和出气表面碰撞形成直接流污染,且其量级远大于返回流污染.因此,在航天器设计中尽可能使用凸形表面作为敏感的出气表面可以有效降低出气分子污染.

关键词: 出气分子, 环境散射, 返回流, 试验粒子Monte Carlo方法, 半球

Abstract: Test particle Monte Carlo (TPMC) method is presented. Return flux on four geometric surfaces due to ambient scatter of outgassing molecules is simulated. Return flux ratio (RFR) obtained for flow past a sphere is in good agreement with DSMC results. RFR on outgassing and freestream conditions for flows past three geometric bodies, including a circle flat plate, a convex and concave hemisphere, is investigated. RFR for flows past a circle flat plate and a concave hemisphere is much greater than that for flows past a convex hemisphere. Outgassing molecules collide on outgassing surfaces directly forming direct flux contamination for flows past concave surfaces, which is much greater than RFR. Thus, using convex outgassing surfaces in spacecraft design can decrease return flux contamination effectively.

Key words: outgassing molecules, ambient scatter, return flux, test particle Monte Carlo, hemisphere

中图分类号:

V211.25

靳旭红, 黄飞, 程晓丽, 王强. 航天器表面环境散射返回流TPMC模拟[J]. 计算物理, 2015, 32(5): 529-536.

JIN Xuhong, HUANG Fei, CHENG Xiaoli, WANG Qiang. Test Particle Monte Carlo Simulation of Return Flux on Spacecraft Surfaces due to Ambient Scatter of Outgassing Molecules[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2015, 32(5): 529-536.