Numerical simulation of particle trajectories within a cyclone

cyclone;  numerical simulation;  coupling;  Trajectory

The particle motion in the cyclone was studied by numerical simulation: the Reynauds stress model of turbulent anisotropy was used for the single-phase flow field, and the random orbital model with phase-coupled phase coupling was adopted for the gas-solid two-phase flow field. By describing the motion trajectory of particles, the physical mechanism of particle movement in the cyclone separator is revealed. The results show that the motion trajectories of particles are complex and have great randomness. In particular, small particle size particles are significantly affected by air turbulence, even if the particle size and incidence position are the same, their motion trajectories are different, and the final position is also different; Particles with small particle sizes are more susceptible to secondary eddy currents, which reduces the efficiency of the separator; In addition, several phenomena affecting the separation efficiency, such as upper ash ring, exhaust pipe short-circuit flow and dust outlet remixing, are also simulated, which lays a foundation for further research on the separation mechanism theory and experimental research of cyclone separator.