ABSTRACT

Flow field characteristics of Falcon separator are studied by CFD simulation based on Euler-Euler model as multiphase flow model and Reynolds stress model as turbulence model, including particle movement state in delamination area and separation area, three phase (Tangential, radial and axial directions) velocity distribution and turbulence field distribution. Simulation results show that particle movement trajectory is a three-dimensional helical structure with circular motion in groove, which can be regarded as “a circular harmonic motion of a roller coaster”; velocity distribution in the delamination area is almost same as other centrifugal separators but it is quite different in the groove; with feeding of recoil water, the turbulence intensity in the separation area is increased obviously, but it has a lower influence on the disturbance at upper layer of convective membrane, which enhanced the separation effect.

摘要

以欧拉-欧拉模型为多相流模型，雷诺应力模型为湍流模型，通过CFD模拟研究了Falcon分离器的流场特性，包括分层区和分离区的颗粒运动状态，三相（切向、径向和轴向）速度分布和湍流场分布。仿真结果表明，粒子运动轨迹为凹槽内圆周运动的三维螺旋结构，可视为“过山车的圆周谐波运动”；分层区域的速度分布与其他离心分离器几乎相同，但在凹槽中却有很大不同；随着反冲水的加入，分离区的湍流强度明显增加，