RNG k-ε模型数值模拟油雾燃烧流场
Numerical Simulation of Three-Dimensional Spray Combustion Flow Field by RNG k-ε Turbulent Model
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摘要: 采用RNG(R enorm alization G roup)k-ε紊流模型对某环形燃烧室火焰筒内三维两相燃烧流场进行数值模拟。运用偏微分方程法和区域法生成贴体网格,EBU-A rrhen ius紊流燃烧模型估算化学反应速率,六通量热辐射模型估算辐射通量。在非交错网格下求解气相采用S IM PLE算法,液相采用颗粒轨道模型和PS IC算法。近壁区处理分别采用两层和三层壁面函数。计算数据与试验值比较表明,采用三层壁面函数的RNG k-ε模型更适用于模拟三维两相燃烧流场。Abstract: RNG(Renormalization Group) k-ε turbulent model was applied to the numerical simulation of the three-dimensional two-phase combustion flow field in an annular combustor.A body-fitted grid was generated by an elliptical grid generation procedure and the zone method.EBU-Arrhenius combustion model was used to determine the rate of reaction,and six-flux radiation model was used to predict the distribution of the heat flux.SIMPLE algorithm with the 3-D non-staggered grid system was employed to solve the governing equations.The liquid phase equations were solved with the particle trajectory model and the PSIC algorithm.The three-layer and two-layer wall function were applied to prediction of flow in the near wall region.Computations are in fairly good agreement with experiments.The comparison indicates that RNG k-ε turbulent model with three-layer wall function is more reliable for modeling 3-D spray combustion flow field.
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