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为探究涡轮叶间燃烧性能,设计了4种不同当量比的工况,利用FLUENT软件的Realizable k-ε湍流模型、PDF燃烧模型、DO辐射模型和离散相模型对燃烧室的流动及燃烧进行数值模拟.结果表明:燃烧室能在广泛的当量比(2.59～0.81)下保持性能稳定,燃烧效率保持在96%以上、总压损失低于2.4%,气体温度提高650,K左右;降低当量比,能够提高燃烧效率,降低CO、UHC、NOx等污染物排放,改善温度分布,但会造成更大的总压损失;最优当量比等于1.00,此时燃烧效率在99.95%以上,总压损失相对低(1.5%),出口径向温度呈抛物线型分布,最适合燃烧室设计.与文献对比发现,选取的工况合理,其结果对涡轮叶间燃烧室设计具有参考价值.
In order to explore the combustion performance among turbine blades, four different equivalent ratio operating conditions were designed. The realizable k-ε turbulence model, PDF combustion model, DO radiation model and discrete phase model of FLUENT software were used to calculate the flow and combustion in the combustion chamber The results show that the combustion chamber can maintain stable performance at a wide equivalence ratio (2.59 ~ 0.81), the combustion efficiency is maintained above 96%, the total pressure loss is less than 2.4% and the gas temperature is increased about 650 K; the equivalence ratio , Can improve the combustion efficiency and reduce the emissions of pollutants such as CO, UHC, NOx and improve the temperature distribution, but cause greater total pressure loss; the optimal equivalence ratio is equal to 1.00, the combustion efficiency is above 99.95%, the total pressure loss Relatively low (1.5%), the outlet radial temperature is parabolic distribution, the most suitable for the combustion chamber design.Compared with the literature found that the selection of a reasonable operating conditions, the results of the turbine chamber combustion chamber design has a reference value.