直升机红外抑制器结构参数对抑制器性能影响的数值和实验研究  

Numerical and experimental research on the effect of structural parameters of helicopter infrared suppressor on its performance

作　　者：陈苏麒 单勇[1] 张靖周[1] 张序墉 CHEN Suqi;SHAN Yong;ZHANG Jingzhou;ZHANG Xuyong(Key Laboratory of Thermal Management and Energy Utilization of Aircraft,Ministry of Industry and Information Technology,College of Energy and Power Engineering,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：《航空动力学报》2023年第5期1102-1113,共12页Journal of Aerospace Power

基　　金：国家科技重大专项(J2019-Ⅲ-0009-0053)。

摘　　要：在模型实验验证的基础上,采用数值模拟的方法,研究了一种红外抑制器二元混合管结构参数对红外抑制器整体气动性能和温度场的影响。研究结果表明:在研究参数范围内,随着二元混合管出口宽度的增大,二元引射喷管引射系数先上升后下降,弓形挡板冷端平均温度增幅为24%;随着二元混合管扩张角增大,引射系数下降,弓形挡板冷端平均温度增幅为3%;适当延长混合管直段长度,引射系数先缓慢上升而后下降,弓形挡板冷端温度变化较小。能否有效利用主流动量、抑制主流的流动分离是提高引射系数的关键。弓形挡板冷端表面温度受弓形挡板内部引射气流、弓形挡板冷端下游滞止涡和二元混合管窄边出口的回流冷气三者共同影响。Based on model experiment verification,a numerical simulation method was used to study the effect of the structural parameters of an infrared suppressor’s two-dimensional mixing duct on the overall aerodynamic performance and temperature field of the infrared suppressor.Results showed that:within the scope of the parameters,with the increase of the outlet width of the two-dimensional mixing duct,the pumping coefficient of the two-dimensional ejector nozzle increased first and then decreased,and the average temperature of the bow-shaped baffle cold side increased by 24%.As the expansion angle of the two-dimensional mixing duct increased,the pumping coefficient decreased,and the average temperature of the bow-shaped baffle cold side increased by 3%.If properly extending the length of the straight section of the mixing duct,the pumping coefficient first slowly rose and then decreased,and the temperature change at the bow-shaped cold side was small.The key to improve the pumping coefficient is whether the main flow’s momentum can be effectively used and the flow separation of the main flow can be suppressed.In general,the surface temperature of the bow-shaped baffle cold side is affected by the internal eject flow of the bow-shaped baffle,the stagnation vortex downstream the bow-shaped baffle cold side,and the cold backflow at the narrow edge outlet of the two-dimensional mixing duct.

关 键 词：红外抑制器 二元混合管 引射系数 弓形挡板 主流动量 流动分离 

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]