基于FLUENT软件建立了导弹羽烟紫外辐射模型, 针对固体火箭发动机的羽烟中包含大量的高温反应气体和金属氧化物, 其中, CO+O的化学反应是紫外波段的主要辐射源, 氧化铝颗粒的热辐射与散射作用直接影响紫外辐射的能量分布等情况,按照氧化铝颗粒的直径分布服从Rosin-Rammler分布, 忽略气相的散射, 通过灰气体加权平均模型(WSGGM)来计算变化的吸收系数, 采用离散坐标法求解辐射传递方程, 给出了导弹羽烟紫外辐射分布仿真结果, 并与其他仿真结果进行了比较分析。

Based on computational fluid dynamics (CFD) software FLUENT, a 2-D model is developed for the calculation of UV radiation from rocket plume. The solid rocket exhaust plume is composed of hot reactive gases and metallic oxide particles like alumina. Calculations take into account the chemiluminence reaction of CO+O, which is the dominant source of radiation in the UV wavelength band considered, and particle emission-scattering effects produced by alumina particles. The size distribution of alumina particle is assumed to be Rosin-Rammler distribution, and the scattering effect from gas is excluded, and absorption coefficient is calculated through weighted sum of gray gases model (WSGGM). The radiation transport equation (RTE) is solved by the discrete ordinate method (DOM). Finally, the simulation result is compared with Fillip’s(Ref.[1]).