多粒度火箭喷焰尘埃等离子体云空间扩散效应研究

Rocket plume dusty plasma cloud is a special phenomenon in human activities, which causes interference to the nature, and significantly affects the ionosphere characteristics. The diffusion process of different diameter particle in the rocket plume dusty plasma cloud was simulated with single particle trajectory -- a particle simulation method, and the influence of particle size on the diffusion was analyzed. The research results show that: the rocket plume plasma dust cloud with multi particle size distribution eventually spread results in the formation of uneven spatial structure of a different height, different regions and different sizes of a plurality of mixed clouds; the earth's magnetic field effect is more obvious on small particle, which will drive the eastward drift; the drift distance of particle with 1nm diameter is about 80km, with a relatively higher hovering position and smaller area; while almost no drift and a relatively lower hovering position and bigger area for the dust particle with 100nm diameter; the vertical downward under the gravity and pressure gradient, as well as the horizontal drift with the Lorentz force show a gradual slowdown after the acceleration; for vertical downward motion, the acceleration and deceleration process of larger size particle is relatively faster, which arrives in the hovering position rapidly, while the small particle is slower and the time arriving in the hovering position is relatively longer.