高空离轨发动机流场红外辐射特性研究

高超声速飞行器大攻角机动时,其离轨发动机产生的喷流与高速稀薄的大气来流产生强烈干扰,流场情况复杂,流场红外辐射也是天基红外系统探测的标志性事件.本文针对高超声速飞行器发动机喷流与稀薄来流的相互干扰情况,采用数值求解Navier-Stokes方程模拟干扰流场,采用逐线积分法得到气体红外辐射特性,结合反向蒙特卡洛方法计算得...

Infrared radiation characteristics of high-altitude off-orbit engine plume

When a hypersonic vehicle maneuvers at a high angle of attack,the jet generated by its off-orbit engine interferes strongly with the high-speed thin atmospheric flow,and the flow field is complicated,and the infrared radiation generated by the flow field is also a landmark event in space-based infrared system detection.In this paper,aiming at interference situation of the jet flow of hypersonic flight vehicle engine and thin flow,Navier-Stokes equations are numerically solved to simulate the interference flow field,and the infrared radiation characteristics of gas are obtained by the line-by-line integration method.Combining with the backward Monte Carlo method,the infrared radiation characteristic of exhaust plume are obtained when the aircraft flight′s altitude is 94 kilometers,with no wind,different incoming flow attack angles and different ve-locities are considered,and the observability of low orbit satellites is evaluated.The simulation results show that for a given observation position,the intensity of infrared radiation in each band is low when there is no wind,and the maximum value is 10^?9 W/m².Under the influence of incoming flow attack angles,the infrared signal intensity of the flow field increases significantly with greater attack angle and velocities and the maximum value reaches 10^?6 W/m².The atmospheric attenuation effect has great influence on the observability of different observation positions.The results can provide reference for infrared warning and anti-missile of hypersonic vehicle.