喉管直径对旋风分离器性能影响的仿真研究

采用数值模拟方法研究了在普通Lapple型(d/D=0.5)旋风分离器气流出口处外加不同直径的喉管结构对于其流场及性能的影响。采用雷诺应力模型(RSM)模拟旋风分离器内的各向异性湍流,同时采用拉格朗日颗粒追踪(LPT)模型计算颗粒运动。结果表明,喉管直径能有效控制内旋涡的大小,从而影响旋风分离器的性能。随着喉管直径减小,涡核直径先逐渐减小;当喉管直径与筒体直径比值减小至0.3后,涡核直径趋于稳定,颗粒收集效率相对较高;存在一个较优的喉管直径与筒体直径比值范围0.2~0.3,使得效率较高的同时具有较低的压降。

Numerical study of the effect of hollow throat diameter on the performance of cyclone separator

The effect of different diameter hollow throats at gas flow outlet of the cyclone separator on the flow field and performance of Lapple (d/D=0.5) cyclone separator was studied by numerical simulation.The Reynolds stress model (RSM) was used to simulate the anisotropic turbulence in the cyclone,whereas the particle motions were traced using the Lagrangian particle tracking (LPT) model.The results show that hollow throat diameter can effectively control the size of the inner vortex,and thereby affect the performance of the cyclone.As the hollow throat diameter decreases,the average diameter of vortex core gradually decreases.When the ratio of hollow throat diameter to the cylinder diameter is reduced to 0.3,the diameter of vortex core tends to be stable,and the particle collection efficiency is relatively high.There is a superior ratio of hollow throat diameter to cylinder diameter ranging from 0.2 to 0.3,resulting in higher efficiency and lower pressure drop as well.