稀薄环境下发动机高空羽流流动与辐射特征  

Flow and infrared radiation characteristics of high-altitude plume in thin atmosphere

作　　者：包醒东 郑学合[2] 田源 王振华 王思慧 肖志河[1] BAO Xingdong;ZHENG Xuehe;TIAN Yuan;WANG Zhenhua;WANG Sihui;XIAO Zhihe(National Key Laboratory of Scattering and Radiation,Beijing 100854,China;The Defense Technology Research Academy of China Aerospace Science&Industry Corporation,Beijing 100854,China;Beijing Institute of Electronic System Engineering,Beijing 100854,China)

机构地区：[1]北京环境特性研究所散射辐射全国重点实验室,北京100854 [2]中国航天科工防御技术研究院,北京100854 [3]北京电子工程总体研究所,北京100854

出　　处：《红外与激光工程》2024年第12期31-42,共12页Infrared and Laser Engineering

摘　　要：高空羽流指发动机在稀薄环境工作时产生的燃气射流迅速膨胀扩散流动状态。急剧膨胀的羽流产生的红外信号被广泛应用于空间目标的探测、跟踪和识别。建立了直接模拟蒙特卡洛方法结合带滑移修正的计算流体力学方法,研究了从喷管内部到出口以至近场、远场的高空羽流场,在此基础上,采用佛奥特线型描述稀薄气体展宽,结合逐线积分法和视在光线法计算得到了超窄谱的高空羽流红外辐射特性,利用理论模型和实验数据,综合校验了高空羽流流动与辐射模型的有效性。研究结果表明:高空羽流辐射能量主要集中于喷口附近以及激波层内,沿着射流轴线方向及越过分离波线后,亮度呈指数下降,整体上高空羽流流场与亮度场具有相似性,羽流场分布类似羽毛状,光谱的发射和吸收集中在谱线中心区,表现为谱线较分立,亮度场呈现月牙状;发动机射流总压增大会显著扩大分离波线和羽流辐射亮度,而发动机射流总温增大对其分离波线不产生影响,但会极大提升其羽流辐射亮度;自由来流密度或速度增大,会显著压缩羽流膨胀边界,但对辐射强度影响较小;利用推力及其自由来流速度、密度无量纲化表征后,其分离流线具有非常好的一致性,发动机射流总压、总温对高空羽流辐射影响显著,而自由来流变化对其影响较小。Objective For relatively high-density areas inside and near the exit,axial symmetry can be used to compress the Navier-Stekes equation description,and the realizable turbulence model is closed to the model equation.Use a limited volume method to discrete,and the time is promoted to adopt hidden methods.Axially simulates the Monte Carlo method described by axisymmetric in the spray exit and far field.Combined with the HITEMP2010 database,the spectral absorption coefficient of the gas component of infrared radiation is calculated by line-byline integral method.The radiation transmission equation that is regarded in the light method is used to solve the high-altitude feathers.Experimental data of high-altitude feather flow flow is used to verify the effectiveness of high-altitude feathers flow and radiation computing models in this article.Results and Discussions Through the effects of analysis of the total pressure and total temperature conditions of different shots and the effects of the general temperature conditions on the flow of high-altitude feathers and their infrared radiation characteristics,the calculation conditions of different shots are used(Tab.1).The display of the non-balance effect mainly occurs in the shock area(Fig.3).The pressure at the ink at the entrance will have a more obvious impact on the contour,spectral level,and the brightness of the ranceling layer of the separation wave line(Fig.4).The brightness distribution of the same calculation in different bands is similar,and the differences are mainly magnitude(Fig.5).The difference between the brightness in the same calculation in different bands is mainly values(Fig.6).Calculation conditions of different freedom flow(Tab.2)show that the greater the density of freedom,the more powerful the impact on the compression of the shooting(Fig.7).Increased freedom flow density will slowly raise the spectral radiation intensity(Fig.8).Freedom flow has a small impact on the relatively high-voltage area near the engine exit(Fig.9-Fig.10).After different

关 键 词：高空羽流 飞行状态 流动特征 辐射特征 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]