Numerical Simulation of the Effects of Block Height on the Gas-Solid Flow in a Fuel-Rich/Lean Burner by the Hard-Sphere Model

摘要

The particle dispersion mechanisms in the gas-solid two-phase jet for a fuel-rich/lean burner have been numerically investigated by means of coupling the hard-sphere model with the computational fluid dynamics (CFD). In the computation of solid flow, the hard-sphere model was employed to deal with the particle-particle interactions. The numerical simulation was carried out based on the commercial software package Fluent. The influence of the collision block height on the particle distribution in the gas-solid fuel-rich/lean burner was investigated in this study. The particle-particle collision was simulated, and its effect on the fuel-rich/lean separating performance was evaluated. The results indicated that the particle-particle collision number and the concentration ratio increased with the collision block height increasing from 40 to 60 mm. A good fuel-rich/lean separating performance can be obtained with the collision block height of 60 mm. The particle dispersion between the fuel-rich side and the fuel-lean side became more uniform as a result of the particle-particle interactions. The corresponding experimental results were used to validate the numerical results with the hard-sphere model, and a better agreement between the simulation and experiments was achieved due to the particle-particle collisions.