Abstract
This paper simulates and analyzes the flow field characteristics and the random features of particle trajectories inside a hydrocyclone based on computational fluid dynamics, constructs a turbulent model for the random separation of particles, and investigates the velocity of hydrocyclone in different directions and the discharge methods of particles. The conclusion of the study shows that the flow field velocity on both sides of the hydrocyclone axis is not the same, which proves that the internal flow field of the hydrocyclone is asymmetric. In terms of radial velocity, the farther away from the axial center of the hydrocyclone is, the smaller the radial velocity is; and the closer it is to the axial center, the greater the velocity oscillation is. In terms of the axial velocity, there is a gradual-change zone in the position far away from the axis, where the turbulence and backflow inside the flow field interact with each other to form a multi-layered vortex, and the vortex appears in an unfixed and asymmetrical position. The eddies of the turbulence have a much greater influence on the radial velocity than on the axial velocity, and the existence of the gradual-change zone will cause an uneven concentration distribution within the hydrocyclone. The particle separation effect of the hydrocyclone is related to the position from which the particles injected into the container, the farther away the particle injection point is, the longer the particles stay in the external swirl, and the easier the particles are discharged from the bottom of the hydrocyclone. The trajectories of the particles have large discreteness.
