水力喷射空气旋流器中射——旋流耦合流场的模拟分析

Numerical Simulation of the Jet-cyclone Coupling Flow Field in A Water-sparged Aerocyclone

水力喷射空气旋流器(WSA)是一种新型高效的气液传质设备。本文采用雷诺应力模型和VOF模型对水力喷射空气旋流器内耦合场的流场分布进行了三维数值模拟研究。模拟研究结果表明,随着气速的增加,耦合场的速度分布的对称性不断减弱,且湍动能的均值沿竖直方向的衰减速率变大。其中轴向速度沿径向分布出现的最大值发生由靠近WSA的器壁附近向中心排气管附近转移的现象;径向速度在耦合场中部达到最大值;切向速度沿径向分布,普遍出现2个在WSA器壁附近和中心排气管附近的极值区域。研究结果可为对WSA的深入认识提供参考。

water-sparged aerocyclone（WSA） is a new and high efficient gas-liquid mass transfer equipment.The distribution of flow field in WSA was simulated by using 3 dimensional（3 D） reynolds stress model（RSM） and the multiphase flow model of volume of fluid（VOF）.This work aims to explore the distribution rule of coupling velocity field in different area.The simulation results match well with measured pressure drop data.With the increase of gas inlet velocity,the symmetry of distribution of coupling field velocity is continuously weakening,and the attenuation rate of the mean of turbulent kinetic energy turns larger along the vertical direction.The maximum of axial velocity along the radial distribution appears metastasis from the vicinity of the wall near the WSA to the center of the exhaust pipe.Radial velocity reaches a maximum in the middle of the coupling field.Generally there are two extreme values,tangential velocity along the radial distribution,near the WSA wall and the center of the exhaust pipe.The results can provide a reference for more in-depth understanding of WSA.