隔热屏的流场计算及其屈曲分析  

Flow Field Calculation and Buckling Analysis for Afterburner

作　　者：张环[1] 谭辉平[2] 刘洪[1] 尚伟钧 赵坚行[1] 

机构地区：[1]南京航空航天大学动力工程系,南京210016 [2]广东轻工职业技术学院机械系,广州510300

出　　处：《燃烧科学与技术》2000年第2期107-110,共4页Journal of Combustion Science and Technology

摘　　要：采用数值分析方法模拟了带有隔热屏、火焰稳定器和尾喷口的加力燃烧室热态流场 ,并对隔热屏进行屈曲分析 ,计算中采用 k-ε双方程模型描述紊流特性 ,采用 EBU -Arrhenius燃烧模型计算化学反应速率。为了考虑火焰热辐射对气体温度分布的影响 ,用热通量法的辐射模型来估算辐射通量。在热态流场计算基础上 ,数值研究了发动机不同工况和隔热屏不同冷却结构及流量分配对加力室流场和隔热屏以及筒体壁温的影响。此外 ,还利用流场计算提供的气动和热负荷对隔热屏进行屈曲分析 ,根据实际情况 ,对隔热屏受力情况作了简化 ,把带波纹的隔热屏简化为圆柱壳 ,采用有限元方法对其屈曲模态和临界载荷进行了计算 。WT5”BZ]The flow field calculation and buckling analysis were conducted for the afterburner with a heat shield,flame stabilizer and jet nozzle.The solution domain spanning the entire region between the centerline and the afterburner wall with the heat shield was represented as a blockage to the mesh.The k ε model is employed to describe the turbulence characteristics.The EBU Arrhenius combustion model is used to determine the reaction rate.To consider the influence of heat radiation on the gas temperature distribution,a heat flux model is applied to predict the heat flux.The governing equations are integrated by the Hybrid scheme.The SIMPLE solution procedure was used for flow calculations.Predictions are used as aerodynamic and the heat loads for the buckling analysis.The buckling analysis of a cylindrical case simpliflied from a real shaped heat shield is described.The finite element solution applied to calculate the buckling model and the critial load.Compared with the experimental data,the computational results are satisfactory. [WT5”HZ]

关 键 词：数值模拟 隔热屏 屈曲分析 流场计算 航空发动机 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]