Investigation of particle-laden turbulent flow in free shear turbulent combustion

Two- and three-dimensional simulations and laboratory trials were performed to study particle-laden turbulent flows in free shear layers and within the boundary layer next to solid walls. Attention is focused on the dissipative effect of the particles on the carrier gas turbulent field and the predicted dispersal of particles under the random influence of the turbulent gas field, i.e., the mean and fluctuating components of the gas-particle forces. A first approximation of the velocity fluctuations and the mean flow components are calculated to satisfy a locally incompressible Poisson equation based on a pressure potential. The fluctuational velocity field of the vapor components and the forces on the particles were statistically decomposed, and the probability distribution integration was approximated through ensemble averaging for a finite summation of random samples. Determinations were made of the most-probable cluster trajectories, the particle aggregate cloud concentrations, and the spatial distributions. The results were compared with experimental data for premixed two-channel separated flows in a channel with a splitter plate. The results indicate that further development of the boundary conditions near the wall is required.