CAJ | 학술논문

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。
개소시험입자Monte Carlo （ test particle Monte Carlo， TPMC）방법，병채용해방법대4충항천기표면출기분자형성적배경산사반회류진행수치모의。기중，원구출기표면적계산결과여이유적DSMC （ direct simulation Monte Carlo）결과일치，험증료방법적정학성。차외，대불동출기화래류조건하원형평판、철반구화요반구3충항천기간화표면출기분자형성적배경산사반회류진행계산，결과표명：출기표면외형시영향반회통량비적일개중요인소；원형평판화요반구출기표면적반회통량비원대우철반구표면적；요반구표면적출기분자회직접화출기표면팽당형성직접류오염，차기량급원대우반회류오염。인차，재항천기설계중진가능사용철형표면작위민감적출기표면가이유효강저출기분자오염。
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.