为了定量研究复燃对固体火箭尾焰红外辐射特性的影响，建立了一个可以计算固体火箭尾焰复燃流场和红外辐射特性的模型：使用Fluent软件计算固体火箭尾焰复燃流场；分别使用窄带模型和米氏散射理论计算气体和Al2O3的辐射参数；使用有限体积法(FVM)求解尾焰中的辐射传输方程(RTE)。利用上述模型，分别研究了复燃对无Al2O3粒子和含有Al2O3粒子两种固体火箭尾焰红外辐射特性的影响，并分析了对二者影响差异的原因。结果表明，复燃使无粒子尾焰光谱辐射强度增幅显著，在2.5～3.0 μm和4.2～4.7 μm两个主要辐射波段平均辐射强度的增加比例分别达到了46.4%和58.4%；复燃使含粒子尾焰光谱辐射强度增幅较小，在2.5～3.0 μm和4.2～4.7 μm两个波段平均辐射强度的增加比例分别为7.7%和8.4%。初步分析认为，复燃使两种尾焰温度增幅不同导致了辐射增幅的差异。

Aimed at studying the influence of afterburning on the infrared radiation of a solid rocket exhaust plume, a model which can calculate the afterburning flow field and infrared radiation of a solid rocket exhaust plume is founded. The Fluent software is used to calculate the afterburning flow field of a solid rocket exhaust plume. Then, a narrow band model and the Mie scattering theory are employed to calculate the radiation parameters of gas and Al2O3. The finite volume method (FVM) is used to solve the radiation transfer equation (RTE). Based on this model, the influences of afterburning on the infrared radiation of solid rocket exhaust plumes both without and with Al2O3 are studied respectively, and the cause of the difference of the influence degree between the two cases is analyzed. Results show that, afterburning can enhance the infrared spectral radiation of the plume without Al2O3 greatly, and the average increase radio of the two domain radiation band of 2.5～3.0 μm and 4.2～4.7 μm achieve 46.4% and 58.4% respectively. Besides, the radiation increment of plume with Al2O3 is smaller, and the average increase proportions of the two radiation bands 2.5～3.0 μm and 4.2～4.7 μm achieve 7.7% and 8.4% respectively. It is considered that the difference of infrared radiation increment results from the difference of temperate increment between the two cases.