红外抑制器混合管壁肋片强化传热和引射特性  

Heat transfer enhancement and ejection characteristics of mixing pipe with ribs for infrared suppressor

作　　者：吴忠诚 单勇[1] 张靖周[1] 杨宗耀 WU Zhongcheng;SHAN Yong;ZHANG Jingzhou;YANG Zongyao(Key Laboratory of Thermal Management and Energy Utilization of Aircraft,Ministry of Industry and Information Technology,College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院航空飞行器热管理与能量利用工业和信息化部重点实验室,南京210016

出　　处：《北京航空航天大学学报》2024年第6期2009-2017,共9页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：为了降低直升机分流引射式红外抑制器外露遮挡罩表面温度,提出抑制器外侧混合管表面肋片强化换热结构,采用数值模拟的方法,对抑制器混合管表面肋片结构下的引射和强化传热特性进行了研究。结果表明:与混合管表面无肋片结构相比,肋化的混合管表面对流换热增加了83%,辐射换热减少了31%,遮挡罩壁面平均温度降低了7 K;遮挡罩外侧狭缝进气面积增加后,二级引射冷气量增加了近3倍,遮挡罩壁面平均温度降低了18 K;在遮挡罩上、下位置增加引射口后,引射气流可直接作用于遮挡罩高温壁面,遮挡罩壁面热斑消失。This paper proposes an enhanced heat transfer structure with ribs on the outer mixing pipe surface of the infrared suppressor in order to lower the surface temperature of the exposed covering shelter of the helicopter infrared suppressor.The ejection and heat transfer enhancement characteristics under the ribbed structure of the infrared suppressor's mixing pipe surface are studied using a numerical simulation.The results show that the ribbed mixing pipe surface convective heat transfer is enhanced by 83%,the radiation heat transfer is reduced by 31%,and the average temperature of the covering shelter surface is reduced by nearly 7 K compared with the mixing pipe surface without rib structure.The amount of second-stage induced ambient air is increased by nearly triple,and the average temperature of the covering shelter surface is reduced by nearly 18 K when the slit-inlet area on the covering shelter is increased.The hot spot on the covering shelter vanishes when the ejector airflow can directly operate on the high-temperature surface of the covering shelter after the ejection apertures at the up and down positions of the covering shelter are increased.

关 键 词：红外抑制器 肋片 引射 遮挡罩 强化传热 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]