土卫六探测器高超声速化学非平衡特性数值计算  

Numerical Calculation of Hypersonic Chemical Nonequilibrium Characteristics of Titan Detector

作　　者：徐一航 陈少松[1] 周航 XU Yi-hang;CHEN Shao-song;ZHOU Hang(School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《气体物理》2022年第1期38-44,共7页Physics of Gases

摘　　要：为了研究土卫六探测器在地球大气和土卫六大气中飞行时气动热环境的差异,采用数值模拟的方法分别对地球大气成分和土卫六大气成分下探测器前方流场内气动热环境进行了研究,得到如下结论与地球大气条件相比,土卫六大气条件下探测器表面的热流密度较高,其峰值可达到地球大气条件的1倍以上.探测器表面的热流密度先随着高度的减小而增加,而后当速度小于一定程度时热流密度开始减小.CH_(4)在激波层内发生较大程度的解离反应,置换反应生成的强辐射物CN在脱体激波之前形成一道小的激波薄层.随着攻角的增大下,表面热流密度增加,上表面热流密度减小.因此,当探测器以一定攻角进入大气时,下表面的热防护十分重要.In order to study the difference of aerothermal environment between the Earth′s atmosphere and Titan′s atmosphere,the numerical method was adopted to simulate the aerothermal environment in the flow field in front of the Titan detector.It is found that,compared with the Earth′s atmosphere conditions,the heat flux on the detector surface is higher under the Titan′s atmosphere conditions.Its peak value can reach more than 1 time of the Earth′s atmosphere conditions.The heat flux on the detector surface first increases with the decrease of height and then decreases when the velocity is less than a certain degree.The dissociation reaction of CH_(4) occurs to a large degree within the shock layer,and the strong radioactive substance CN generated by the replacement reaction forms a small shock thin layer before the detached shock wave.With the increase of attack angle,the heat flux on the lower surface increases while that on the upper surface decreases.Therefore,when the detector enters the atmosphere at a certain angle of attack,the thermal protection of the lower surface is very important.

关 键 词：探测器 地球大气 土卫六大气 数值模拟 非平衡效应 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]