Study the infrared characteristics of the solid rocket plume with DOM method and the influence of altitude

The discrete ordinates method in general body-fitted coordinates was established to simulate the infrared characteristics of solid rocket plume, where the variation of Al₂O₃ partilcles and the temperature difference between gaseous and Al₂O₃ condensed components were considered. The infrared characteristics of one solid rocket plume, in spectrum 2-5 μm, at ground condition and several flying altitudes were computed, and the inflence of flying altitude on plume radiation was analyzed. The results show that the radiation of Al₂O₃ particle clouds plays dominent place in infrared radiation of solid rocket plume, which showed different influence with wavelength, and the radiative intensity in spectrum 2-5 μm along the outward normal direction of plume surface increase when flying altitude increases.