Numerical simulation of gas-particle flows with different swirl numbers in a swirl burner

Swirl burner design was optimized by simulating swirl gas-particle flows with different swirl numbers at the exit of a small scale swirl burner for pulverized coal furnaces using the k-∊-k
p
model. The predicted two-phase time averaged velocities and particle concentration distributions for several different cases were compared to improve the design. The effect of the swirl number on the two-phase velocities and particle concentration was investigated. The results give the two phase axial and tangential time averaged and fluctuation velocities and particle concentrations, Slowing that large recirculation zones of gas and particles forms in the near axis region of the burner exit, but the particle concentration in the recirculating zone is very low.