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本文提出了Y型介质雾化烧嘴混合段三元两相流动的物理模型,并建立了与之对应的数学模型。文中用数值计算方法对此段流场进行了探讨性求解。为了计算界面波动的影响,引入了界面函数,并且考虑了由于气相中液滴的存在而造成的有效粘度的变化。对核心湍流计算时采用了K—ε湍流模型,对三元的连续性方程、动量方程、湍动能方程、湍流耗散率方程采用数值方法进行了计算,解出了Y型介质雾化烧嘴混合段内压力场、速度场、湍流流场、液膜的变化;并对求解出的压力场与实验结果进行了校核,对进一步完善数学模型提出了一些改进意见。
In this paper, the physical model of the three-phase two-phase flow in the Y-type media atomizing burner mixing section is proposed and the corresponding mathematical model is established. In this paper, the flow field in this section is explored by numerical method. In order to calculate the effect of interface fluctuations, an interface function is introduced and the change in effective viscosity due to the presence of droplets in the gas phase is taken into account. The K-ε turbulence model was used to calculate the core turbulence. Numerical calculations were carried out on the ternary continuity equation, momentum equation, turbulent kinetic energy equation and turbulent dissipation rate equation, Pressure field, velocity field, turbulent flow field and liquid film in the mixing section. The pressure field and the experimental results are verified, and some suggestions are put forward to further improve the mathematical model.