### 一体化红外抑制器遮挡和出口修型对后机身表面温度和红外辐射特性的影响

1. 南京航空航天大学 能源与动力学院, 南京 210016
• 收稿日期:2019-09-16 修回日期:2019-09-30 出版日期:2020-02-15 发布日期:2019-11-07
• 通讯作者: 张靖周 E-mail:zhangjz@nuaa.edu.cn

### Effects of sheltering and outlet shaping on surface temperature and infrared radiation characteristics of rear airframe with an integrating infrared suppressor

JIANG Kunhong, ZHANG Jingzhou, SHAN Yong, ZHENG Zhen, YANG Zongyao

1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
• Received:2019-09-16 Revised:2019-09-30 Online:2020-02-15 Published:2019-11-07

Abstract: A numerical investigation is performed to illustrate the effects of internal sheltering and outlet shaping on the surface temperature and infrared radiation characteristics of rear airframe with an integrating infrared suppressor. The results show that the internal sheltering between the mixing duct and rear airframe skin can decrease the peak temperature on the rear airframe side-surface corresponding to the mixing duct trailing section, either by a full-covering shelter or semi-covering contoured plate. Both schemes can effectively reduce the infrared radiation intensity in 3-5 μm and 8-14 μm bands detected in the horizontal detection plane as well as from the top in the vertical detection plane. However, the presence of a full-covering shelter affects the rotor downwash flow suction into the rear airframe, making the 3-5 μm infrared radiation intensity a little higher than the baseline case, when viewed from the bottom in the vertical detection plane. The outlet shaping could effectively improve the temperature distribution on the rear airframe side-surface, although it shows a weak role on reducing the infrared radiation intensity in 3-5 μm and 8-14 μm bands. By using the slit outlet structure to cool the lower side-surface of the rear airframe, the peak temperature could be maintained close to the ambient temperature, within a 10 K relative increase.