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研究了长/短套管两种结构的二元引射喷管在高空飞行的无人机上的推力特性,以及对无人机3~5μm波段红外辐射特征分布的影响,同时还对比了高空和地面状态下二元引射喷管推力和红外辐射特征.排气系统和无人机的流场、温度场采用商用软件Fluent计算,红外辐射特征采用自主开发的软件(NUAA-IR)进行计算.结果表明:高空状态下二元引射喷管仍可以提高推力特性,但其效果略弱于地面状态;无人机采用二元引射喷管后在大部分探测方向上的红外抑制效果明显,最大降幅为90%;机尾探测方向上长/短套管两种结构的二元引射喷管的红外抑制规律与地面状态不同,短套管二元引射喷管的红外辐射强度大于长套管二元引射喷管,最大增幅为7%.
The thrust characteristics of the binary ejecting nozzle with two structures of long / short bushing at high altitude and the characteristics of the infrared radiation distribution in the 3 ~ 5μm band of UAV are studied. At the same time, Thrust and Infrared Radiation Characteristics of Binary Jet Nozzle under Ground State The flow field and temperature field of exhaust system and UAV are calculated by commercial software Fluent and infrared radiation characteristics are calculated by NUAA-IR software. The results show that the birefringence nozzle can still improve the thrust characteristics under high altitude, but its effect is slightly weaker than the ground state. The infrared suppression effect of the unmanned aerial vehicle in most of the detection directions is obvious after the binary ejection nozzle is used. The maximum decline of 90%; tail detection direction of the long / short bimodal two structures of the structure of the binary ejection nozzle infrared suppression law and the ground state is different from the birch birefringence nozzle infrared radiation intensity is greater than the long Bushing dual ejection nozzle, the largest increase of 7%.