对含固体粒子的气固两相尾焰红外辐射特性进行了仿真建模,并采用光线跟踪方法计算了尾焰辐射强度和辐射抑制率。设计了飞行状态尾焰流场的仿真环境和空基红外相机成像的仿真场景,通过固体粒子辐射抑制机理确定了粒子直径、粒子流量和粒子复折射率是影响辐射抑制率的主要因素。仿真计算结果表明:减小粒子直径、增大粒子流量能增强固体粒子的辐射抑制能力;增大粒子的吸收截面能增强固体粒子在气体吸收谱段的辐射抑制能力,同时降低其在非气体吸收谱段的辐射抑制能力;在某些情况下,固体粒子会增加尾焰辐射强度并改变光谱辐射特性。

In this paper, the infrared radiation characteristics of the gas-solid two-phase exhaust plume containing solid particles are simulated and modeled. The ray tracing method is used to calculate the radiation intensity and radiation suppression rate of the exhaust plume. The simulation environment of the exhaust plume flow field and the imaging simulation scene of the air-based infrared camera are designed. Through the mechanism of solid particle radiation suppression, the particle diameter, particle flow rate, and particle complex refractive index are determined as the main influencing factors of the radiation suppression rate. Simulation calculation results show that reducing the particle diameter and increasing the particle flow rate can enhance the radiation suppression ability of the solid particles. Increasing the particle absorption cross-section can enhance the radiation suppression ability of solid particles in the gas absorption waveband, and at the same time reduce their radiation suppression ability in the non-gas absorption waveband. In some cases, the solid particles may increase the radiation intensity of the exhaust plume and change the spectral radiation characteristics.