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

doi:10.7527/S1000-6893.2019.23497

流体力学与飞行力学

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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

蒋坤宏, 张靖周, 单勇, 郑禛, 杨宗耀

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

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

摘要/Abstract

摘要： 针对与后机身融合的一体化红外抑制器模型，采用数值模拟的方法研究了内部遮挡和出口修型对后机身表面温度场和红外辐射特性的影响。在混合管外部采用遮挡套或曲面遮挡板可有效降低后机身侧壁面对应混合管后段的局部区域最高温度，两种方式均可有效降低水平探测面以及铅垂面上方3~5 μm波段和8~14 μm波段红外辐射强度峰值；然而，加装遮挡套方式会影响旋翼下洗气流的导入，使3~5 μm波段的红外辐射强度在铅垂面下方较基准模型有小幅的增加。对后机身排气口进行出口修型，虽然对降低后机身3~5 μm和8~14 μm波段红外辐射强度的作用效果并不显著，但可以有效消除排气出口下方壁面的高温区，其中采用狭窄流道引气冷却方式可以使得后机身侧壁仅高于环境温度10 K左右。

关键词: 直升机, 一体化红外抑制器, 内部遮挡, 出口修型, 温度分布, 红外辐射

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.

Key words: helicopter, integrating infrared suppressor, internal sheltering, outlet shaping, temperature distribution, infrared radiation

中图分类号:

V231.1

蒋坤宏, 张靖周, 单勇, 郑禛, 杨宗耀. 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[J]. 航空学报, 2020, 41(2): 123497-123497.

JIANG Kunhong, ZHANG Jingzhou, SHAN Yong, ZHENG Zhen, YANG Zongyao. Effects of sheltering and outlet shaping on surface temperature and infrared radiation characteristics of rear airframe with an integrating infrared suppressor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(2): 123497-123497.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

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

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

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