低发射率材料涂敷区域对排气系统壁温和红外特性的影响  

Effects of low emissivity material coating site on wall temperature and infrared characteristics of exhaust system

作　　者：曹飞飞 吉洪湖[1] 于明飞[2] 吴开军 Cao Feifei;Ji Honghu;Yu Mingfei;Wu kaijun(College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Guizhou Aero Engine Research Institute,Aero Engine Corporation of China,Guiyang 550081,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]中国航空发动机集团公司贵州航空发动机研究所,贵州贵阳550081

出　　处：《红外与激光工程》2020年第10期79-87,共9页Infrared and Laser Engineering

摘　　要：为了研究红外低发射率材料涂敷区域对排气系统壁温和红外特性的影响,在相同实验工况下,实验测量了3种涂敷方案:(1)仅中心锥涂敷;(2)仅混合器内表面涂敷;(3)中心锥与混合器内表面同时涂敷。下轴对称和S弯二元排气系统壁温和红外辐射特性。结果表明:涂敷低发射率材料将导致表面温度升高,同时也影响排气系统非涂敷区域的壁面温度分布。高温部件涂敷低发射率材料时,在涂敷区域可被直接探测的角域内,可有效抑制排气系统的红外辐射,但在涂敷区域不能被直接探测的角域内其影响规律因涂敷方案而变,在3种涂敷方案中,S弯二元排气系统仅涂敷混合器内表面,轴对称排气系统中心锥和混合器内表面同时涂敷低发射率材料时整体红外抑制效果最好。In order to study the effects of the parts coated by infrared low-emissivity material on the wall temperature and infrared radiation(IR) characteristics of the exhaust system, the wall temperatures and IR characteristics of the axisymmetric and serpentine 2-D exhaust system were measured in three coating schemes,i.e.,(1) only central cone was coated;(2) only mixer inner surface was coated;(3) both central cone and mixer inner surface were coated, under the same experimental condition. The experimental results show that the temperature of the surfaces coated with low-emissivity materials increases, and that of the non-coating surfaces is also affected by the coating layer. When high-temperature parts are coated with low-emissivity materials, the IR intensity of the exhaust system can be effectively suppressed in detection angles where the coating surface can be directly detected, while in other angles the IR intensity varies with the coating scheme. It is appropriate to only coat the inner surface of the mixer for serpentine 2-D exhaust system, and coat the central cone and the inner surface of the mixer together for an axisymmetric exhaust system in order to achieve better IR suppression.

关 键 词：红外隐身 排气系统 低发射率涂层 轴对称收敛喷管 S弯二元喷管 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]