摘要
使用FLUENT对某涡扇发动机环形回流燃烧室进行了冷热态流场的三维数值模拟。比较了Standard k-ε、RNG k-ε、Realizable k-ε三种湍流模型,涡团耗散、平衡PDF两种燃烧模型及两种不同燃油雾化直径的数值模拟结果;比较了考虑火焰筒壁换热、大弯管冷却孔前后的数值模拟结果;分析了燃烧室性能。得出如下结论:Realizable k-ε模型、平衡PDF模型较其它模型有一定的优点;给定合理的燃油雾化直径对得到合理的雾滴轨迹分布、燃烧过程和温度场很重要;考虑火焰筒壁换热能得到较合理的壁温;考虑大弯管冷却孔能得到合理的出口温度场分布;燃烧室性能参数基本满足设计要求。
3D numerical simulations of a turbofan engine annual reverse -flow combustor were performed using FLUENT. Firstly, the simulation results from three turbulent models, two combustion models and two fuel atomization diameters were compared. Then, the results of models with liner wall heat transfer or cooling holes of the outer transition piece were analyzed. Lastly, the performances of the combustor were calculated. Some conclusions have been drawn： （ 1 ） Realizable k - ~ model and equilibrium PDF model are better than the others. （2） Reasonable fuel atomization diameter is important to simulate the particle traces, combustion processes and temperature fields. （3） Reasonable liner wall temperature may be acquired by considering its heat conduction process. （4） The temperature pattern factor of the outlet is perfect with cooling holes in the outer transition piece. （5） The performance parameters of the combustor basically fulfill the design specifications.
出处
《燃气轮机技术》
2011年第3期21-26,共6页
Gas Turbine Technology
基金
国家自然科学基金资助项目(No.50706054
No.50806077)
关键词
环形回流燃烧室
数值模拟
流场
燃烧室性能
annual reverse- flow combustor
numerical simulation
flow field
combustor performances
