NUMERICAL AND EXPERIMENTAL STUDY ON SOOT ACCUMULATION ON THE WALL OF FALLING FUEL FILM MICRO-COMBUSTOR

Fluid flow contributes much to fuel-air mixture formation in a micro-combustor, the RNG k-epsilon turbulence model was used to simulate the cold flow field of a falling fuel film micro-combustor, and comparison was made between numerical result and experimental results. It is shown that the RNG k-epsilon turbulence model translated the flow field of a complex structure micro-combustor and the soot accumulation on the wall of combustion chamber. The experimental results showed that soot accumulation occurs in vortex backflow area near the wall of combustion chamber and the numerical methods is helpful for understanding the way of soot accumulation in the wall of combustion chamber. Therefore, modifications on the flow field with different diameters and entrance direction of the air flow into the primary combustion chamber were made. The numerical simulation of flow distribution showed that the flow field of micro-combustor could be ideal for eliminated soot accumulation.