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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。
A three-dimensional numerical simulation of the hot and cold flow field of a turbofan engine annular recirculation combustor was performed using FLUENT. Compared with the three turbulence models Standard v-ε, RNG k-ε, and Realizable k-ε, two models of vortex-shedding and equilibrium-PDF combustion and the numerical simulations of two different fuel atomization diameters were compared. Wall heat transfer, large elbow cooling holes before and after the numerical simulation results; analysis of the combustion chamber performance. The conclusions are as follows: Realizable k-ε model and balanced PDF model have some advantages over other models. Given a reasonable fuel atomization diameter, it is very important to get a reasonable drop trajectory distribution, combustion process and temperature field. Wall heat transfer can get more reasonable wall temperature; consider the cooling pipe cooling outlet can get a reasonable outlet temperature distribution; combustion chamber performance parameters to meet the basic design requirements.