为了研究飞行参数对液体火箭尾焰红外辐射特性的影响，利用FLUENT软件计算不同飞行参数下的尾焰流场，利用HITEMP数据库计算燃气的辐射参数，使用有限体积法(FVM)计算尾焰在2.0~5.0 μm波段光谱辐射特性。据此研究了火箭飞行高度和飞行速度对尾焰2.0~5.0 μm波段光谱辐射强度以及2.5~3.0 μm和4.2~4.7 μm两个波段辐射强度影响。研究表明，飞行高度和速度对液体火箭尾焰红外辐射强度的影响主要是通过改变流场的温度和尺寸实现的。飞行速度不变，在0~40 km范围内，随着飞行高度的增加，尾焰辐射强度呈增大趋势，并且在4.2~4.7 μm波段的辐射强度增幅较大；飞行高度不变，随着飞行速度的增加，尾焰辐射强度呈先减小后稳定趋势，且2.5~3.0 μm波段的辐射强度减幅较大。

Aimed at studying the influence of flight parameters on the infrared radiation of a liquid rocket exhaust plume, the FLUENT software is used to calculate the flow field of an exhaust plume under several different flight parameters, then the HITEMP database is adopted to calculate the radiation parameters and the finite volume method (FVM) is used to calculate the infrared radiation between 2 μm and 5 μm. Based on this work, the influences of the altitude and velocity on the spectral radiation intensity as well as 2.5~3.0 μm and 4.2~4.7 μm band radiation intensity are studied. It is found that, the influences of flight parameters on the infrared radiation are exerted by changing the temperature and size of the exhaust plume flow field. At the same velocity, as the altitude increases from 0 to 40 km, the infrared radiation intensities increase gradually, and the band radiation of 4.2~4.7 μm increases faster. At the same altitude, as the Mach number increases, the infrared radiation intensity decreases at first and then becomes stable, and the band radiation of 2.5~3.0 μm decreases faster.