根据尾焰中气体的吸收特性, 基于蒙特卡洛法建立了尾焰红外辐射特性模型, 并用该模型计算了某型发动机尾焰在5个不同红外波段的辐射特性(1.32~1.69 μm, 1.56~2.27 μm, 2.27~3.8 μm, 3.8~8.3 μm, 8.3~20 μm).为了验证仿真模型的有效性, 进行了发动机点火试验.试验结果与仿真结果表明该型涡喷发动机在2.27~3.8 μm波段辐射最强, 在长波波段8.3~20 μm辐射面积最大.

According to the absorption characteristics of exhaust plume, a numerical model of the infrared radiation characteristics of the exhaust plume based on Monte Carlo method is set up. Then, the infrared radiation characteristics of exhaust plumes from a engine are simulated in the five infrared bands (1.32~1.69 μm, 1.56~2.27 μm, 2.27~3.8 μm, 3.8~8.3 μm and 8.3~20 μm) by this model. For verifing the rationality and reliability of the numerical simulation model, a test of the spectrum features of exhaust plume from the engine is conducted. The results suggest that there is strongest radiation of the liquid-engine exhaust plume in the band of 2.27~3.8 μm and maximum radiation area in the long-wave infrared band of 8.3~20 μm.