土卫六探测器高超声速化学非平衡特性数值计算

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...

Numerical Calculation of Hypersonic Chemical Nonequilibrium Characteristics of Titan Detector

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 CH₄ 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.