分流喷管出口构型对红外抑制器性能影响的数值和实验研究  

Numerical and experimental research on the effect of outlet structural parameters of diverter nozzle on infrared suppressor performance

作　　者：杜家栋 单勇[1] 张靖周[1] Du Jiadong;Shan Yong;Zhang Jingzhou(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,江苏南京210016

出　　处：《红外与激光工程》2024年第2期58-70,共13页Infrared and Laser Engineering

摘　　要：在模型实验验证的基础上,采用数值模拟的方法,对比分析了分流喷管出口构型对直升机红外抑制器气动性能、温度场和红外辐射强度的影响。研究结果表明:相比基准分流喷管模型(Origin),分流喷管出口带一定外扩张角的波瓣出口结构(Lobe_1)的引射系数略微降低、总压恢复系数降低,中间混合管出口排气温度峰值却降低了65.1 K,同时降低了混合管上下方区域的壁面温度,但造成混合管中后段外侧壁面局部区域温度升高;外扩张角为0的波瓣出口结构(Lobe_2)增加引射系数3.8%,总压恢复系数与Lobe_1结构基本相当,中间混合管出口排气温度峰值也降低了62.8 K,尤其是其降低混合管壁面温度的效果最佳;分流喷管出口突片结构(Tab)增加引射系数10.6%,但总压恢复系数降低0.7%,同时,内侧混合管出口排气平均温度降低19.3 K,混合管壁面降温效果相对较差。总体来看,波瓣和突片结构都起到增强引射、强化混合的作用,尤其是波瓣出口结构(Lobe_2)对降低抑制器总体红外辐射效果最好,在3~5μm波段的红外辐射强度最大可降低21%;在8~14μm波段,其红外辐射强度最大可降低15%。Objective With the rapid development of advanced infrared detection technology and infrared tracking and striking technology,armed helicopters are increasingly threatened by infrared guided missiles from ground and air in the modern high-tech battlefield.In order to improve the battlefield survivability and combat assault capability of armed helicopters,advanced infrared stealth technology must be developed.The research shows that the use of shielding technology and the improvement of the ejector capacity of the suppressor have a significant effect on reducing the infrared radiation intensity of the exhaust system,but the specific technical means should depend on the structure of the infrared suppressor.For the diverter nozzle ejector infrared suppressor,limited to the size and shape of the helicopter,it is difficult to improve the ejector capacity of the diverter nozzle and reduce the exhaust and wall temperature in a limited space.Therefore,it is necessary to discuss the modification scheme of the diverter nozzle outlet to reduce the infrared radiation intensity of the diverter nozzle ejector infrared suppressor.Methods A physical model was established including diverter nozzle,gas-collecting chamber,ejected gas inlet,curved mixing tube,covering shelter,and outer cover(Fig.1).The structured and unstructured hybrid grids were established,and the infrared radiation of the infrared suppressor was calculated by the forward-backward raytracing method.The calculation method is verified by experimental data(Tab.1-2,Fig.9).By comparing the pumping coefficient,total pressure recovery coefficient,outlet and wall temperature distribution of the mixing tube and infrared radiation intensity of the diverter nozzle ejector infrared suppressor(Fig.10-14),the effect of outlet structural parameters of diverter nozzle on infrared suppressor performance is analyzed from multiple perspectives.Results and Discussions The experimental data are used to verify the calculation method.The pumping coefficient and total pressure recovery c

关 键 词：红外抑制器 分流喷管 引射系数 红外辐射 气动性能 

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]