几何对称横向射流入射对尾喷流红外辐射特征抑制的数值研究
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摘要
降低高温核心区长度是减小尾喷流红外辐射的有效途径。针对某轴对称收敛喷管,研究1种横向射流主动强化尾喷流掺混与红外抑制技术,采用横向射流技术强化外流与热喷流的掺混,通过数值模拟方法研究了2股横向射流喷射频率与流量变化对强化尾喷流掺混与红外抑制特性的影响规律。结果表明:在与横向射流流动方向垂直的探测面上尾喷流辐射强度衰降明显,探测角度为90°时红外辐射强度衰降可达48%。随着2股射流流量差的减小,强化掺混与红外抑制效果逐渐增强。
Decreasing the plume temperature is an effective way to reduce infrared radiation of plume. Aiming at an axisymmetric convergent nozzle, a mixing and infrared suppression technology of the plume was studied, which enhanced by a transverse jet including the outer and hot jet mixing. The influence law of the frequency and flow changing for two kinds of transverse jets on enhancing the plume mixing and infrared suppression characteristics was studied by the numerical simulation. The results show that the radiation intensity of the plume is significantly reduced on the vertical transverse jet. The intensity of infrared radiation reduced by 48% when the detection angle is 90°. The results of enhanced mixing and infrared suppression are increased gradually with the decrease of flow deviation for the two kinds of jets.
Decreasing the plume temperature is an effective way to reduce infrared radiation of plume. Aiming at an axisymmetric convergent nozzle, a mixing and infrared suppression technology of the plume was studied, which enhanced by a transverse jet including the outer and hot jet mixing. The influence law of the frequency and flow changing for two kinds of transverse jets on enhancing the plume mixing and infrared suppression characteristics was studied by the numerical simulation. The results show that the radiation intensity of the plume is significantly reduced on the vertical transverse jet. The intensity of infrared radiation reduced by 48% when the detection angle is 90°. The results of enhanced mixing and infrared suppression are increased gradually with the decrease of flow deviation for the two kinds of jets.
引文
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[3]张靖周,单勇.波瓣喷管引射混合器涡结构的数值研究[J].空气动力学学报,2005,23(3):355-359.ZHANG Jingzhou,SHAN Yong.Numerical investigation of vortical structures in the lobed mixer-ejector[J].Acta Aerodynamica Sinica,2005,23(3):355-359.(in Chinese)
[4]张靖周,单勇,李立国.直升机排气系统用波瓣喷管引射-混合式红外抑制器研究[J].航空学报,2002,28(7):32-37.ZHANG Jingzhou,SHAN Yong,LI Liguo.Investigation on lobed nozzle mixer-ejector infrared suppressor for helicopter exhaust system[J].Acta Aeronautica et Astronautica Sinica,2002,28(7):32-37.(in Chinese)
[5]刘友宏,李立国.有无中心锥圆排波瓣喷管引射器内流场模拟与比较[J].航空动力学报,2002,17(3):280-286.LIU Youhong,LI Liguo.Numerical simulation of flow field in circularly lobed exhaust-ejector mixer with/without a central plug[J].Journal of Aerospace Power,2002,17(3):280-286.(in Chinese)
[6]刘友宏,樊超,谢奕,等.波瓣数对波瓣强迫混合排气系统性能影响[J].航空动力学报,2010,25(8):1683-1689.LIU Youhong,FAN Chao,XIE Yi,et al.Effect of lobe numbers on the performance of a lobed mixer in the forced mixing exhaust system[J].Journal of Aerospace Power,2010,25(8):1683-1689.(in Chinese)
[7]黄勇,郭志辉,魏福清,等.小突片对热射流红外辐射的影响研究[J].推进技术,2001,22(2):122-125.HUANG Yong,GUO Zhihui,WEI Fuqing,et al.Effect of tabs fixed on a convergent nozzle to the infrared radiation of the exhausting hot jet[J].Journal of Propulsion Technology,2001,22(2):122-125.(in Chinese)
[8]黄勇,郭志辉,魏福清,等.收扩喷管加小突片对尾喷流红外辐射的影响[J].航空动力学报,2001,16(1):19-22.HUANG Yong,GUO Zhihui,WEI Fuqing,et al.Effect of tabs fixed on a convergent divergent nozzle on infrared radiation of exhausting jet[J].Journal of Aerospace Power,2001,16(1):19-22.(in Chinese)
[9]邓洪伟,邵万仁,周胜田,等.某型航空发动机喷管红外辐射特征数值模拟和实验研究[J].航空发动机,2010,36(1):44-49.DENG Hongwei,SHAO Wanren,ZHOU Shengtian,et al.Numerical simulation and experimental investigation of infrared radiation characteristics of an aeroengine exhaust nozzle[J].Aeroengine,2010,36(1):44-49.(in Chinese)
[10]Ragaller P A.Supersonic jet noise reduction via pulsed microjet injection[R].AIAA-2009-3224.
[11]Castelian T.Noise reduction by impinging microjets:an aerodynamic investigation testing microjet parameters[R].AIAA-2007-3419.
[12]Brenton G.Jet noise reduction using aqueous microjet injection[R].AIAA-2004-2971.
[13]Mehmet,Bahadir A.Significant improvements on jet noise reduction by Chevron-Microjet combination[R].AIAA-2007-359.
[14]尚守堂,张青藩.波反射激励效应抑制超声速射流红外辐射的试验研究[J].航空发动机,2001(3):25-28.SHANG Shoutang,ZHANG Qingfan.Experimental study of wave reflection incentive effect of inhibition of supersonic flow of infrared radiation[J].Aeroengine,2001(3):25-28.(in Chinese)
[15]尚守堂,曹茂国,邓洪伟,等.航空发动机隐身技术研究及管理工作探讨[J].航空发动机,2014,40(2):6-9.SHANG Shoutang,CAO MAOguo,DENG Hongwei,et al.Discussion on aeroengine stealth technology research and management[J].Aeroengine,2014,40(2):6-9.(in Chinese)
[16]朱希娟,额日其太,李家军,等.脉冲射流强化混合对喷流红外辐射特性的影响[J].北京航空航天大学学报,2011,37(5):551-555.ZHU Xijuan,Eriqitai,LI Jiajun,et al.Effect of jet mixing enhancement by pulsed blowing on infrared radiation of plume[J].Journal of Beijing University of Aeronautics and Astronautics,2011,37(5):551-555.(in Chinese)