Numerical simulation of the initial destabilization of an air-blasted liquid layer
Numerical simulation of the initial destabilization of an air-blasted liquid layer
复制标题
喷气液体层初始失稳的数值模拟
DOI：
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发表时间：
2017
影响因子：
3.7
通讯作者：
O. Desjardins
中科院分区：
文献类型：
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作者：
G. Agbaglah;R. Chiodi;O. Desjardins
使用内部多相Navier-Stokes求解器对平面空气/水空气喷射雾化进行数值模拟，该求解器使用半拉格朗日几何流体体积法来跟踪界面的位置。该求解器精确地保持了质量，并减轻了动量和动能守恒误差。与最近的实验获得了很好的协议时，比较物理量，如液体锥长度，最大波频率和空间增长率的主要不稳定性。的气体流入的倾斜，这模仿的分离板的斜率，示出，以提高初级雾化。使用物理上正确的空气/水参数运行的三维大涡模拟用于提供流量的统计数据。气体层在入口附近是层流的，在更下游的位置处变成湍流。液体波峰扩展成薄片，如实验中所观察到的那样，薄片破裂成二次液滴。
Numerical simulations of a planar air/water air-blast atomization are performed using an in-house multiphase Navier–Stokes solver which uses a semi-Lagrangian geometric volume of fluid method to track the position of the interface. This solver conserves mass exactly and mitigates momentum and kinetic energy conservation errors. Excellent agreement with recent experiments is obtained when comparing physical quantities, such as the liquid cone length, maximum wave frequency and spatial growth rate of the primary instability. The inclination of the gas inflow, which mimics the slope of the separator plate, is shown to enhance the primary atomization. A three-dimensional large-eddy simulation, run using physically correct air/water parameters, is used to provide the statistics of the flow. The gas layer is laminar close to the entrance and becomes turbulent at positions further downstream. The liquid wave crests expand in thin sheets, which break into secondary droplets, as observed in experiments.