宽带k分布模型计算液体火箭尾焰辐射信号

快速计算火箭尾焰辐射信号对导弹的识别和跟踪具有重要意义。先利用工程经验公式计算得到尾焰的流场,采用宽带k分布模型计算液体火箭尾焰的辐射信号,并与逐线计算基准解比较,发现宽带k分布模型在探测器工作光谱区域内的相对计算误差基本都小于10 %。利用该模型研究飞行参数对尾焰辐射信号的影响,计算结果表明:喷管出口温度、马赫数、非计算度增大,液体火箭尾焰的辐射强度增大；海拔高度升高,不同探测器工作光谱区域尾焰辐射强度变化趋势有所不同。

Wide band k-distribution model for calculating radiation signal of liquid rocket exhaust plume

Quick calculation of rocket exhaust plume radiation signal is of great significance for missile identification and tracking.Firstly,the flow field of liquid rocket exhaust is calculated by engineering empirical formula,and the radiation signal of liquid rocket exhaust plume is calculated by wide band k-distribution model.Secondly,compared with the line-by-line reference solution,it is found that the relative calculation error of wide band k-distribution model in the working spectrum region of the detector is basically less than 10 %.At last,the model is used to study the influence of flight parameters on the radiation signal of exhaust plume.The results show that the radiation intensity of liquid rocket exhaust plume increases with the increase of nozzle exit temperature,Mach number and non-calculating degree,and the variation trend of the radiation intensity of exhaust plume varies with the increase of altitude.