模化比对直升机用红外抑制器红外辐射特性的影响
Effect of scale factor on infrared radiation characteristics of helicopter infrared radiation suppressor
-
摘要: 对波瓣喷管一弯曲混合管构成的直升机用红外抑制器壁面和尾焰的红外辐射特性进行了一系列的数值研究,旨在将三维流场数值计算、壁温计算与红外辐射计算结合起来综合分析抑制器红外辐射特性,与相关实验数据的对比验证表明计算结果与实验结果仅相差15%左右,且红外辐射强度空问分布规律一致;通过对不同缩比模型的数值计算,揭示了模化比对壁面及尾焰的红外辐射特性的影响规律:(1)几何相似的红外抑制器在主流入口速度、温度相同时,壁面红外辐射强度与几何模化比的2次方成正比;(2)尾焰红外辐射强度与几何模化比的2.32次方成正比.Abstract: A research on the infrared radiation characteristics for the helicopter infrared radiation suppressor consisted of lobed nozzle and curved mixing duct is performed basing on numerical calculation.In the computation,3-D flow field computation and wall temperature computation and infrared radiation computation are combined to investigate the infrared radiation characteristics of the suppressor.Compared with the experimental data,it is indicated that the relative error between the computational and experimental results is about 15%.Spatial distribution of infrared radiation intensity has the same law as that from experiments.And a series of computations on different scale factor model are conducted to obtain the effect of model scale to the wall and plume radiations.The results indicated that the infrared radiation intensity of wall is proportional to power 2 of scale factor and the infrared radiation intensity of exhaust flume is proportional to power 2.32 of scale factor on the case of the velocity,temperature and pressure of the primary flow being keeped the same for different scaled model.
-
[1] Francois T.Internal aerodynamics of infrared suppressors for helicopter engines[R].40th Annual National Forum of the American Helicopter Society,1984:1-14. [2] Power G D,McClure M D,Vinh D.Advanced IR suppressor design using a combined CFD/test approach[R].AIAA Paper 1994-3215. [3] 张靖周,李立国,高潮,等.波瓣喷管红外抑制系统的实验研究[J].航空动力学报,1997,12(2):212-214.ZHANG Jingzhou,LI Ligao,GAO Chao,et al.An experimental study on a lobed nozzle of an infrared suppression system.[J]Journal of Aerospace Power,1997,12(2):212-214. [4] Presz W M,Gousy R G,Morin B L.Forced mixer lobes in ejector designs[R].AIAA Paper 86-1614,1986. [5] Presz W M,Morin B L,Blinn R F.Short efficient ejector systems[R].AIAA Paper 87-1837,1987. [6] Liu Y H.Experimental and numerical investigation of circularly lobed nozzle with/without central plug[J].International Journal of Heat and Mass Transfer,2002,45:2577-2585. [7] 单勇,张靖周.波瓣喷管引射-混合器的数值研究与验证[J].推进技术,2004,25(4):320-324.SHAN Yong,ZHANG Jingzhou.Numerical computation and examination of a lobed mixer-ejector[J].Journal of Propulsion Technology,2004,25(4):320-324. [8] 杜朝辉,钟芳源,赵岩.模化比对船用排气红外抑制装置红外辐射特性的影响及修正[J].红外与毫米波学报,2001,20(6):437-441.DU Zhaohui,ZHONG Fangyuan,ZHAO Yan.Effecct of scale factor on infrared radiation characteristics of marine exhaust system with infrared signature suppression device and its correction[J].J.Infrared Millim.Waves,2001,20(6):437-441. [9] 周绍荣,杜朝辉,陈汉平.舰船排气系统红外抑制装置的湍流场及温度场分析[J].红外与毫米波学报,2000,19(2):134-138.ZHOU Shaorong,DU Zhaohui,CHEN Hanping.Analysis of the turbulent flow and thermal fields within the infrared signature suppression device of a marine gas turbine exhaust system[J].J.Infrared Millim.Waves,2000,19(2):134-138. [10] 张靖周,李立国,高潮.直升机排气系统红外抑制器的模型实验研究[J].红外与毫米波学报,2005,24(2):125-129.ZHANG Jingzhou,LI Liguo,GAO Chao.Model experiments of infrared suppressor for helicopter exhaust system[J].J.Infrared Millim.Waves,2005,24(2):125-129. [11] 陶文铨.数值传热学[M].西安:西安交通大学出版社,1992. [12] Michael F.Modest backward Monte Carlo simulations in radiative heat transfer[J].Journal of Heat Transfer,2003,125(57):57-62. [13] LU Xiaodong,Hsu Peifeng.Reverse Monte Carlo method for transient radiative transfer in participating media[R].Washington,D.C.:ASME International Mechanical Engineering Congress,2003. [14] 余其铮.辐射换热原理[M].哈尔滨:哈尔滨工业大学出版社,2000. [15] Ludwig C B.Handbook of infrared radiation from combustion gasesi[R].NASA SP-3080,1973. [16] 单勇,张靖周.直升机红外抑制器红外辐射特性的数值研究和实验验证[J].红外与毫米波学报,2006,25(2):96-100.SHAN Yong,ZHANG Jingzhou.Computation and validation for the infrared radiation characteristics of helicopter infrared radiation suppressor[J].J.Infrared Millim.Waves.2006,25(2):96-100.
点击查看大图
计量
- 文章访问数: 1663
- HTML浏览量: 3
- PDF量: 406
- 被引次数: 0