DEVELOPMENT OF CFD MODEL FOR A SWIRL STABILIZED SPRAY COMBUSTOR

摘要

Swirling jet characteristics in a commercial burner are studied computationally. The analysis includes a 2D axisymmetric model of the burner which is extended to three dimensions with some preliminary results. In the current study, k-ε and RSM turbulence models were used to simulate the flow field. Specific computational strategies that were adopted to model the swirling flow are also discussed. It was found that the swirl component in the flow caused a flow reversal along the axis resulting in the formation of centretoroidal zone. Case studies ranging from low swirl number of 1.28 to swirl number 3.75 are presented. The vortex size seems to exhibit two types of behavior. For low swirl numbers, the vortex size takes discrete sizes depending on various ranges of swirl numbers. For large swirl numbers, the vortex size seems to demonstrate a continuous increase.