自由分子流区气体外掠平板/圆柱体流动与传热预测  

Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime

作　　者：谢福寿[1,2] 雷刚 徐元元 陈强 邱一男 厉彦忠 XIE Fushou;LEI Gang;XU Yuanyuan;CHEN Qiang;QIU Yinan;LI Yanzhong(School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China)关键词:)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]航天低温推进剂技术国家重点实验室,北京100028

出　　处：《西安交通大学学报》2019年第3期6-12,共7页Journal of Xi'an Jiaotong University

基　　金：航天低温推进剂技术国家重点实验室开放课题(SKLTSCP1610);中国博士后科学基金资助项目(2018M633505);陕西省博士后科研资助项目;国家自然科学基金资助项目(51876153)

摘　　要：针对自由分子流区稀薄气体外掠物体流动与传热问题,基于气体分子动理论方法和相对坐标系思想,推导了预测大气外掠平板和圆柱体传热与流动的无量纲表达式,讨论了雷诺数、马赫数和克努森数对阻力与传热性能的影响。结果表明:在马赫数一定时,随着克努森数不断增加,稀薄气体外掠物体换热能力逐渐减弱;在克努森数一定时,低马赫数(Ma<0.1)对传热性能影响不大,但高马赫数(Ma>0.1)对传热性能影响显著;随着马赫数增加,流动阻力先急剧下降,当到达超声速时逐渐变缓。该研究结果可为飞行器在自由分子流区流动与传热性能预测方面提供理论依据和技术支持。Aiming at the problem of flow and heat transfer of rarefied gas over objects in free molecular flow regime and based on gas molecular kinetic theory and relative coordinate system, dimensionless expressions for predicting the flow and heat transfer performance of gas over flat plates and cylinders are deduced, and the effects of Reynolds number, Mach number and Knudsen number on flow resistance and heat transfer performance are discussed. This research shows that the heat transfer ability gradually weakens with the increasing of Knudsen number when the Mach number is constant;when the Knudsen number is constant, low Mach number (Ma<0.1) has little effect on the heat transfer performance, but high Mach number (Ma>0.1) has significant effect on the heat transfer performance. As the Mach number increases, the flow resistance drops sharply first, and then gradually slows down while reaching the supersonic speed. This study can provide theoretical basis and technical support for the prediction of the flow and heat transfer performance of rarefied gas over aircraft in the free molecular flow regime.

关 键 词：自由分子流区 稀薄气体 流动与传热 气体分子动理论 克努森数 

分 类 号：V411.[航空宇航科学与技术—航空宇航推进理论与工程]