雾化过程的多尺度仿真算法

A new multiscale simulation method for primary atomization

提出了一种雾化过程多尺度仿真算法:对大块液团运动,采用流体体积法直接模拟;将与网格尺度相当或更小的液滴简化成粒子,采用一种基于虚网格的拉格朗日粒子法进行追踪;湍流运动采用了湍流动能单方程输运模型的大涡模拟。基于新算法开发了一套仿真程序,并对此程序进行了验证,对影响模型精度的重要参数进行了深入研究。采用该算法对单股射流的雾化过程进行了仿真,雾场的瞬态和统计特性分析表明,仿真结果与试验结果吻合较好。

A new multiscale method of primary atomization is proposed.The liquid blobs larger than the grid volumes were captured by the volume of fluid algorithm,the droplets comparable with the grid volumes or smaller were simplified to particles and tracked by a Lagrangian particle tracking model on a virtual mesh.Large eddy simulation with one equation sub-grid scale turbulent energy transport model was used to describe the turbulent flow.A new developed code was validated by several cases,and some key parameters were investigated to improve the precision.The primary atomization of a single jet was calculated,and the results of instantaneous and average characteristics are in good agreement with the experimental results.