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尾焰是高空高速无人机红外辐射源的主要组成部分,为了计算高空高速无人机尾焰的红外辐射特性,首先,利用流体仿真软件Fluent对高空高速无人机尾焰的流场进行了数值模拟,在此基础上,利用同时考虑谱线洛伦兹加宽效应和多普勒加宽效应的单线组谱带模型理论SLG以及机体遮挡理论,计算了高空高速无人机尾焰的红外辐射强度;其次,采用倾斜路径传输等效方法计算了大气对红外辐射的透过率;最后,计算并分析了某型高空高速无人机在发动机不同工作状态以及不同方位角和观察仰角条件下经过大气衰减后的红外辐射强度,同时分析了无人机飞行俯仰角对尾焰红外辐射强度的影响。
The tail flame is the main component of the high altitude and high speed UAV infrared radiation source. In order to calculate the infrared radiation characteristics of the tail of the high altitude and high speed UAV, firstly, the fluid field of the UAV tail smoke is simulated by the fluid simulation software Fluent On the basis of the above, based on the single-line grouping band theory SLG which considers both Lorentz broadening effect and Doppler broadening effect, the infrared flames of the UAV tail flame are calculated. Radiation intensity; Secondly, using the equivalent method of inclined path transmission to calculate the atmospheric transmittance of infrared radiation; Finally, the calculation and analysis of a type of high-altitude high-speed UAV under different working conditions of the engine and different azimuths and observation elevation conditions After the atmospheric attenuation of the infrared radiation intensity, at the same time analyzed the UAV flight pitch angle of the tail flame infrared radiation intensity.