全遮挡导流支板对排气系统红外特性的影响  

Effects of fully shielded guiding strut on infrared signatures of exhaust system

作　　者：王浩[1] 吉洪湖[1] 桑学仪 王宇恒 WANG Hao;JI Honghu;SANG Xueyi;WANG Yuheng(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Shanghai Aerospace Control Technology Institute,China Aerospace Science and Technology Corporation,Shanghai 201108,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]中国航天科技集团公司上海航天控制技术研究所,上海201108

出　　处：《航空动力学报》2020年第10期2078-2088,共11页Journal of Aerospace Power

基　　金：国家重大项目培育基金(XBC18244);中央高校基本科研业务费(NZ2016103)。

摘　　要：为了降低末级涡轮转子对排气系统尾向红外(IR)辐射贡献,对涡轮后导流支板进行低红外特征结构设计,通过模型试验的方法研究了基准轴对称排气系统和不同支板冷却状态的全遮挡导流支板(FSGS)排气系统的红外特性。研究结果表明:全遮挡导流支板表面温度低于末级涡轮表面温度,但全遮挡导流支板结构会使下游隔热屏和喷管壁面温度明显升高;全遮挡导流支板对排气系统尾向0~10°角域红外辐射有较好的抑制作用,正尾向红外辐射强度比基准轴对称排气系统低13.9%;支板壁面气膜冷能进一步降低排气系统尾向0~10°角域内的红外辐射强度,支板冷却气密流比(BR)为0.5、0.7和0.9时,全遮挡导流支板排气系统0°方向的红外辐射强度的降幅分别为18.1%、25.8%和34.5%。因此,带气膜冷却的全遮挡导流支板是抑制末级涡轮对排气系统红外辐射贡献的一种非常有效的手段。In order to suppress the contribution of the last-stage turbine rotor to the infrared(IR) radiation in backward of the exhaust system, the fully shielded guiding strut(FSGS) was designed. IR signatures of the baseline axisymmetric exhaust system and the exhaust system with FSGS under different cooling conditions were obtained by experiments. The results indicated that the wall temperature of the FSGS was lower than that of the last-stage turbine rotor. However, the wall temperatures of the heat shield and nozzle of the exhaust system with the FSGS increased. FSGS had an outstanding effect on suppressing the IR radiation of the exhaust system within the directions of 0° ~ 10°, and its IR radiation intensity was 13.9% lower than that of the baseline axisymmetric exhaust system at 0° detection angle. The application of film cooling on the FSGS can further reduce the IR radiation of the exhaust system in those directions mentioned above. Under the blowing ratios(BR) of 0.5, 0.7 and 0.9, the IR radiation intensity of the exhaust system at 0° detection angle was weakened by 18.1%, 25.8% and 34.5%, respectively. Therefore, the FSGS with film cooling is a very effective way to suppress the IR contribution of the last-stage turbine to the exhaust system.

关 键 词：涡扇发动机排气系统 全遮挡导流支板 红外特性 红外抑制 气膜冷却 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]