MODELING DENSE SUSPENSION OF SOLID PARTICLES IN HIGHLY COMPRESSIBLE FLOWS

摘要

Dense suspension of solid particles in highly compressible gas flow was analyzed using a fully Eulerian approach. The simulation performed for the conditions in which the powder loading is high and the two-phase flow is not dilute near the centerline. The simulations showed large variations in the flow regime in the region that most of the particles exist. Unlike the results corresponding to the Lagrangian approach, the flow becomes subsonic near the centerline and the drag force decreases significantly since the relative Mach number is small. Therefore, the particle velocity decreases and consequently the deposition efficiency must decrease. The effect of flow regime on the particle drag force was experimentally measured. The experimental results clearly showed that the variation of flow regime by changing the relative Mach number could significantly change the drag force.