加力燃烧室流场计算及其隔热屏屈曲分析  

Numerical Computations of Afterburner Flows and Heat Shield Buckling

作　　者：张环[1] 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

出　　处：《南京航空航天大学学报》2000年第4期394-399,共6页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：采用有限元方法对加力燃烧室隔热屏进行屈曲分析 ,通过对临界载荷与屈曲模态的计算 ,对隔热屏两种不同结构进行了对比 ,分析结果与试车结果相符。屈曲分析所需的气动和热负荷通过加力燃烧室流场及筒体和隔热屏壁温计算获得 ,计算结果与实验结果一致 。A computational procedure for simulating combustion flows of the afterburner and buckling analysis of heat shield is presented. The k ε two equation model of turbulence is used to calculate the turbulent viscosity. The turbulent combustion is modelled by the k ε g combustion model. The radiant heat transfer characteristics are predicted by the DeMorco Flux model. The computational grids employed are non uniformly distributed. Wall functions are applied to afterburner and heat shield wall. The buckling analysis of the heat shield have been conducted by the finite element solution. According to engineering requirement, complicated external loods on the heat shield are simplified. The buckling analysis of a cylinderical case simplified from the real shaped is described. The buckling model and the critial load are computated for two kinds of different support arrangements. Numerical results are compared with experimental data. Agreement between predictions and measurements shows that the numerical method used in this study is fairly reasonable and appropriate for the primary design of the heat shield.

关 键 词：加力燃料室 屈曲分析 隔热屏 流场计算 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程] V231.9