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引用次数: 3
摘要
计算流体力学(CFD)的数值分析是将实验成本降至最低的技术之一。本文对无底限燃烧器燃烧室内的等温旋流进行了分析。采用reynolds - average Navier-Stokes (RANS)模型来模拟等温流动有很多不同类型的CFD模型,其中包含两个计算方程。采用了标准k-ε、RNG k-ε和可实现k-ε湍流方法等多种模型的RANS。这些分析是为了确定流轴向速度和切向速度的影响,特别是为了获得中心再循环区(CRZ)。旋流器安装在燃烧器上,对燃烧室内的流动形态有重要影响。入口速度U0为30 m/s,通过轴向旋流器进入燃烧器,SN = 0.895,代表高雷诺数Re。这些研究还使用ANSYS Fluent评估了不同RANS模型的效果。横向流场方法已被用来确定两个速度的行为背后的轴向旋流器下游。这些轴向和切向速度的结果用U0归一化。进入旋流器后,速度分布的行为发生了明显的变化,各模型的模式略有不同。然而,它们的流动模式是相似的所有RANS模型平面向燃烧器出口。
Studies of isothermal swirling flows with different RANS models in unconfined burner
Numerical analysis of computational fluid dynamics (CFD) is one of technologies that can be minimized the experimental cost. This paper is presents the isothermal swirling turbulent flows analyses in a combustion chamber of an unconfined burner. There are many types CFD models that can be used in order to simulate isothermal flows with the Reynolds-Averaged Navier-Stokes (RANS) models involving the two equations of calculation. The RANS of various models, including standard k-ε, RNG k-ε and realizable k-ε turbulence approach method was applied. These analyses were studied to define the effect of flow axial velocity and tangential velocity that particularly to obtain the center recirculation zone (CRZ). The swirler is used in the burner that significantly influences the flow pattern inside the combustion chamber. The inlet velocity, U0 is 30 m/s entering into the burner through the axial swirler with SN = 0.895 that represented a high Reynolds number, Re. These studies also performed using ANSYS Fluent to evaluate the effect of difference's RANS models. Transverse flow field methods have been used to determine the both velocity's behaviour behind the axial swirler downstream. These results of axial and tangential velocity were normalized with the U0. The velocity profiles' behaviours are obviously changed after entering the swirler and slightly different pattern of each model. However, their flow patterns are similar for all RANS models plane towards the outlet of a burner.