摘要
为了降低无人机的红外特征及探测距离,采用数值模拟的方法研究了采用二元引射喷管的无人机的红外特征分布,分析了其主要红外辐射贡献源,针对贡献较大的部件采用低发射率材料进行红外抑制,得到了低发射率材料对红外特征和探测距离的影响规律。排气系统和无人机的流场、温度场采用商用软件Fluent计算,红外辐射特征及探测距离采用自主开发的红外软件(NUAA-IRSE)计算。结果表明:发射率由0.9降为0.2后,在3～5μm波段内,无人机的辐射强度的降幅为35%～77%,探测距离的降幅为27%～51%;在8～14μm波段内,无人机的辐射强度的降幅为67%～77%,探测距离的降幅为40%～50%。
In order to reduce the UAV＇s infrared signature and detection range,the infrared signature of UAV with 2-D ejector nozzle is studied by numerical simulation method.The main sources of infrared radiation contribution are analyzed.Moreover.The low emissivity materials are used for large infrared radiation contribution components for infrared suppression.The impact laws of low emissivity material on the infrared signature and the detection range are obtained.The flow field of the exhaust jet and UAV are calculated by the commercial software Fluent.The infrared radiation characteristics and detection range are calculated with an IR analysis software （NUAA-IRSE） developed by our research group.The results show that when the emissivity is reduced from 0.9 to 0.2,In 3-5 μm band,the decreasing amplitude of radiation intensity is 35 ％ to 77 ％,and the decreasing amplitude of detection range is 27 ％to 51％.While in 8-14 μμm band,the decreasing amplitude of radiation intensity is 67％ to 77％,and the decreasing amplitude of detection range is 40％ to 50％.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2013年第5期665-670,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
航空科学基金(2011ZB52028)资助项目
南京航空航天大学基本科研业务费专项科研项目(2011ZB52028)资助项目
关键词
无人机
二元引射喷管
红外辐射
探测距离
低发射率
红外抑制
unmanned aerial vehicle
2-D ejector nozzle
infrared radiation
detection range
low emissivity
infrared suppress
