A 2-D model is developed for the simulation. Calculations take into account the chemiluminence reaction of CO-O,
which is the dominant sources of radiation in the UV wavelength band considered, and particle emission/scattering
effects produced by alumina particles. The alumina particle is considered as a discrete phase through the continuous
flow, assumed to be in solid state with diameters ranging from 5 micron to 17 micron. The atmospheric effects, pressure
and temperature, are included in the boundary condition. Four cases, altitudes at 0km, 4km, 15km and 30km are
calculated separately, and comparisons are made with each other .Finally, the analysis of affecting factors is presented.