辅助动力装置环形回流燃烧室数值研究

利用Fluent软件计算辅助动力装置(auxiliary power unit,简称APU)环形回流燃烧室三维两相喷雾燃烧流场,研究不同进口温度和油气比对两相喷雾燃烧流场的影响,采用标准 k-ε 模型模拟湍流黏性,离散相模型(DPM)追踪油珠运动轨迹,燃烧模型采用非预混平衡化学反应模型.计算结果表明:随着进口温度和油气比的增加,燃烧室出口温度相应增加,但温度分布规律基本保持不变;计算结果与试验测量结果比较吻合,说明采用的数学模型和计算方法可用于预估实际APU回流燃烧室三维两相喷雾燃烧流场. 

Numerical study of auxiliary power unit annular backflow combustor

The influences of different inlet conditions(including inlet temperature and inlet fuel air ratio) on two phase spray combustion flow of auxiliary power unit(APU) combustor were studied by using Fluent software.Standard k-ε model was applied to simulate the turbulent viscosity.The fuel droplet trajectories were modeled in Lagrangian frame of reference by using discrete phase model(DPM).Non-premixed combustion model was used to model turbulence-chemistry interaction.The results reveal that the outlet temperature raise with the increase of inlet temperature and fuel-air ratio,but distribution of temperature is similar.The numerical data agree well with experimental data,which show that the numerical model and method can be used to predict two phase spray combustion flow of APU.