用Tam-Ganesan湍流模型研究排气系统红外辐射特性
Numerical simulation of infrared radiation characteristic of exhaust system using Tam-Ganesan turbulence model
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摘要: 通过三维流场、介质的质量浓度场与辐射场耦合求解方法,计算了1台有中心锥的轴对称喷管的空腔-喷流组合红外辐射特性.利用专门为自由剪切流动发展的Tam-Ganesan湍流模型,有效提高排气系统红外辐射模拟精度.采用有限体积法(FVM)结合窄带模型(NBM)计算了排气系统在3~5μm波段的辐射传输问题,并考虑大气衰减作用.对比了采用标准 k - ε 模型和Tam-Ganesan模型对排气系统核心区长度的影响,以及由此引起的排气系统红外辐射特性的变化.通过与试验数据对比证明了该结果的准确性,结果表明选择合适的湍流模型对计算排气系统红外辐射特性有重要的意义.Abstract: The infrared signature in 3~5μm band of an axisymmetric nozzle was calculated by a three-dimensional code to investigate the improvement of Tam-Ganesan turbulence model in the infrared radiation (IR) of aircraft exhaust system.The flow fields of nozzle were simulated by the finite volume method (FVM),coupled with the standard k-ε turbulence model and Tam-Ganesan model respectively.The infrared signature of the exhaust system was calculated by FVM in non-gray absorbing-emitting media coupled with narrow band model (NBM).The final infrared signature has considered the atmosphere effect.A standard k-ε model was also investigated by being compared with the Tam-Ganesan turbulence model.The Tam-Ganesan turbulence model provided improved mean flow and infrared radiation predictions related to the standard model.It is shown the application of the optimal turbulence model is vital to the calculation of infrared radiation characteristics of exhaust system.
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Key words:
- turbulence model /
- exhaust system /
- infrared signature /
- narrow band model /
- finite volume method
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[1] Segalmun I,Semerjian H.Turbine engine infrared signature program .AD-A028659,1976. [2] 徐南荣,朱谷君.热空腔——喷气流的组合辐射[J].航空动力学报,1995,10(3):295-298. XU Nanrong,ZHU Gujun.Thermal cavity-plume combination radiation[J].Journal of Aerospace Power,1995,10(3):295-298.(in Chinese) [3] 额日其太,王强,陈渭鹏.两种涡扇发动机排气系统红外辐射特性的比较[J].推进技术,2003,24(4):334-367. Eriqitai,WANG Qiang,CHEN Weipeng.Comparative investigation of the infrared characteristics for two exhaust systems of a turbofan engine[J].Journal of Propulsion Technology,2003,24(4):334-367.(in Chinese) [4] 刘友宏,邵万仁,张锦秀.发动机排气系统及尾喷流的流场和红外特征数值模拟[J].航空动力学报,2008,23(4):591-597. LIU Youhong,SHAO Wanren,ZHANG Jinxiu.Numerical simulation of flowfield and infrared characteristics of an aeroengine exhaust system and its plume[J].Journal of Aerospace Power,2008,23(4):591-597.(in Chinese) [5] 黄伟,吉洪湖,斯仁,等.涡扇发动机排气系统红外特征[J].推进技术,2010,31(6):745-772. HUANG Wei,JI Honghu,SI Ren,et al.Infrared characteristics calculating of turbofan engine exhaust system[J].Journal of Propulsion Technology,2010,31(6):745-772.(in Chinese) [6] 王伟臣,李世鹏,张峤,等.火箭发动机羽流红外特性计算方法研究[J].推进技术,2010,31(4):423-427. WANG Weichen,LI Shipeng,Zhang Qiao,et al.Research on the calculation method of infrared signature of rocket motor exhaust plume[J].Journal of Propulsion Technology,2010,31(4):423-427.(in Chinese) [7] 朱希娟,额日其太,李家军,等.微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(4):483-491. Zhu Xijuan,Eriqitai,Li Jiajun,et al.Effect of micro-jets mixing enhancement on infrared radiation of plume[J].Journal of Beijing University of Aeronautics and Astronautics,2011,37(4):483-491.(in Chinese) [8] Georgiadis N J,Yoder D A,Engblom W A.Evaluation of modified two-equation turbulence models for jet flow predictions .AIAA-2006-490,2006. [9] Nicholas J G,James R D.Navier-Stokes analysis methods for turbulent jet flows with application to aircraft exhaust nozzles[J].Progess in Aerospace Sciences,2006,42(5/6):377-418. [10] Thies A T,Tam C K W.Computation of turbulent axisymmetric and noaxisymmetric jet flows using the k-ε model[J].AIAA Journal,1996,34(2):309-316. [11] Pope S B.An explanation of the turbulent round jet/plane jet anomaly[J].AIAA Journal,1978,16(3):279-281. [12] Sarkar S,Lakshmanan B.Application of a reynolds stress turbulence model to the compressible shear layer[J].AIAA Journal,1991,29(5):743-749. [13] Tam C K W,Ganesan A.Modified k-ε turbulence model for calculating hot jet mean flow and noise[J].AIAA Journal,2004,42(1):26-34. [14] Jones W P,Launder B E.The prediction of laminarization with a two-equation model of turbulence[J].Int.J.Heat and Mass Transfer,1972,15(2):301-314. [15] 胡海洋,王强.跨声速条件下轴对称收扩喷管内外流场的数值研究[J].航空动力学报,2008,23(6):1041-1046. HU Haiyang,WANG Qiang.Numerical study on combination flow field of axisymmetric convergent-divergent nozzle under transonic and supersonic conditions[J].Journal of Aerospace Power,2008,23(6):1041-1046.(in Chinese) [16] Bridges J E,Wernet M P.Measurements of the aeroacoustic sound in hot jets .AIAA-2003-3130,2003. [17] ZHU Xijuan,Eriqitai,Li Xixi,et al.Infrared radiation simulation of exhaust system by coupling FVM with narrow band k-distribution[J].Journal of Aerospace Power,2012,27(1):25-32.
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