真空环境下月壤颗粒受力影响因素及空间分布规律的研究

发布时间：2018-07-09 09:20

本文选题：月壤颗粒 + 影响因素　；参考：《天津大学》2014年硕士论文

【摘要】：在月球探测器发动机喷射形成的羽流与月壤颗粒相互作用的过程中,很可能造成探测器的损害,比如污染着陆探测器,造成着陆探测仪所测数据失准甚至导致着陆探测仪损坏。同时,当月球探测器在月球表面着陆或升起时,会扬起附近的月壤颗粒,月壤颗粒向远处运动,对周围人类的基地设施或者设备会产生不良影响。扬起的月壤颗粒对航天器的可靠性提出了严峻的挑战,因此研究羽流场作用下的月壤颗粒的受力影响因素及空间分布规律具有重要的理论意义和应用价值。本文在前期工作基础上,对真空环境下月壤颗粒所受到的各种外力进行了量级分析,讨论了Stokes曳力、升力及重力等7种作用力,确定了影响登月着陆器在下降过程中扬起的月壤颗粒空间分布的主要因素。进一步对Stokes曳力进行了修正,通过编制FORTRAN程序计算并分析了惯性修正因数、滑移修正因数及周围颗粒影响修正因数对月壤颗粒运动规律的影响。同时,通过考虑月壤颗粒相互碰撞中发生的能量损失,采用质量守恒定律和碰撞定律计算颗粒碰撞后的速度,讨论了不同能量恢复系数下月壤颗粒分布规律。在考虑月壤颗粒相互碰撞时的能量损失后,月壤颗粒的分布趋势相比未考虑之前有一定的减弱,并且扬起的高度随着恢复系数的减小而降低。最后,采用Fick扩散方程分析扩散作用对颗粒分布规律的影响,计算结果表明考虑了扩散作用后月壤颗粒的分布出现了一些不均匀性。本文的工作可为羽流场与月壤颗粒相互作用的研究提供重要的参考。
[Abstract]:In the process of interaction between the plume formed by the lunar probe engine jet and the lunar soil particles, it is likely to cause damage to the probe, such as contamination of the landing detector, misalignment of the data measured by the landing detector and even damage to the landing detector. At the same time, when the lunar probe lands or rises on the surface of the moon, it will raise nearby lunar soil particles, which will move in the distance, which will have a negative impact on the surrounding human base facilities or equipment. The raised lunar soil particles pose a severe challenge to the reliability of spacecraft, so it is of great theoretical significance and practical value to study the factors affecting the force and spatial distribution of lunar soil particles under the action of plume flow field. In this paper, based on the previous work, the order of magnitude of various external forces on lunar soil particles in vacuum environment is analyzed, and seven kinds of forces, such as Stokes drag force, lift force and gravity force, are discussed. The main factors affecting the spatial distribution of lunar soil particles raised during the descent of lunar lander were determined. The effects of inertial correction factor, slip correction factor and surrounding particle correction factor on the motion of lunar soil particles were calculated and analyzed by FORTRAN program. At the same time, considering the energy loss in the collision of lunar soil particles, the law of mass conservation and the law of collision are used to calculate the particle velocity after collision, and the distribution of lunar soil particles under different energy recovery coefficients is discussed. After considering the energy loss when the lunar soil particles collide with each other, the distribution trend of the lunar soil particles is weakened, and the elevation of the lunar soil particles decreases with the decrease of the recovery coefficient. Finally, Fick diffusion equation is used to analyze the effect of diffusion on particle distribution. The results show that there are some inhomogeneity in the distribution of lunar soil particles after considering diffusion. The work in this paper can provide an important reference for the study of the interaction between plume flow field and lunar soil particles.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P184.5

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