利用求每个小视场视线方向辐射亮度的方法计算喷流红外辐射的光谱分布。 以辐射传递方程数值和形式为基础, 采用Malkmus统计窄谱带模型和Curtis-Godson（CG）近似求视线方向的辐射强度。 采用CFD分析软件FLUENT模拟流场和组分摩尔分数分布。 建立喷流红外成像仿真模型, 仿真生成了液体火箭发动机热喷流红外图像。 结果表明, 该方法可以很好地分辨出流场的细微结构。 该模型也适用于航空发动机喷流红外辐射计算与仿真。

Spectral distribution of infrared radiation from plume by the method to calculate infrared radiance of the gaze direction in small sight field was calculated. Based on numerical value and form of radiative transfer equation, infrared radiant intensity of the gaze direction was calculated using the Malkmus statistical narrow-band model and CG approach. Flow field and mole fraction distribution were simulated using a FLUENT computational fluid dynamic (CFD) software. Infrared imaging simulation model of hot jet was established. The hot jet’s infrared images of liquid rocket engine were generated. The results demonstrate that the method can detect well-resolved fine structure of flow field. And the model is also applicable to calculation and simulation on infrared radiation of hot jet from engine.