Simulation of particle transport and deposition in a combustor

A computational model for Lagrangian particle tracking for studying dispers ion and deposition of particles in a combustor with swirling flow and chemi cal reaction is developed. The model accounts for the effect of thermophore tic force, as well as the drag and lift forces acting on particles, in addi tion to the Brownian motion and gravitational sedimentation effects. The me an turbulent gas flow, temperature fields and chemical species concentratio n in the combustor are evaluated using the stress transport turbulent model of the FLUENT code. The instantaneous fluctuation velocity field is generated by a Gaussian fil tered white noise model. The simulated axial, radial and tangential mean ga s velocities are compared with the existing experimental data. Ensembles of particle trajectories are generated and statistically analyzed. The effect s of size and initial distribution on particle dispersion and deposition ar e studied. The particle concentration at different sections are also evalua ted and discussed. The results shows that the turbulence dispersion effect is quite important, while the thermophoresis effect is small.