The Study On Influencing Factors Of Different Forces And Laws Of Spatial Distribution For Regolith Particles Under Vacuum Environment

During the lunar probe engine plume interacting with the lunar regolith particles, the probe is likely to be damaged. This may lead to measure inaccurate data, even destroy the landing detector. When the lunar probe landed on the lunar surface, the nearby particles may be raised. The regolith particles move to far away and may have adverse effects to surrounding human base facilities or equipment. The raised regolith particles posed a severe challenge to spacecraft reliability. So the study on influencing factors of different forces and Laws of Spatial distribution for regolith particles has important theoretical significance and application value.On the basis of previous work, the work presented in this paper focuses on the order analysis of seven kinds of forces which the regolith particles get, for example Stokes drag force, lift and gravity forces and so on. The main factors affecting the distribution of regolith particles during the process of the lunar probe declined. The Stokes drag force has been amended. The affect of regolith particles' movement has been calculated by the Inertia correction factor, slip correction factor and correction factor affecting the surrounding particles through FORTRAN program. And then, the energy loss is considered when the lunar soil particles collided with each other. By the law of conservation of mass and energy conservation law, the speed of regolith particles after collision is determined. Distribution of lunar regolith particles is discussed under different energy recovery coefficient. After considering the collision energy loss, the tendency to spread regolith particles weakened. And the smaller the coefficient of restitution, the lower the raising height of the lunar soil particle. Lastly, in considering the diffusion of lunar soil particles, the influence to the distribution of particle by the diffusion effects is discussed through Fick diffusion equation. The calculation results show that the distribution of regolith particles becomes more non-uniformly after considering the diffusion. The present work provides a reference for relevant research field about plume interacting with lunar soil particles.