Numerical Simulation of Mixing Mechanism in Aerial Dynamic Field of New Type Combustion System

In order to solve the problems of oxygen deficient combustion and poor mixing effect of in W-flame boiler, a new type dynamic field was put forward, in which the straight flow of tertiary air-ejecting was changed into the swirl flow, and the cold model of boiler flow filed was simulated by FLUENT in this paper. For the purpose of assessing the mixing mechanism of the new type aerial dynamic field, a concept of mixing factor was introduced and the model to describe the mixing behavior was established according to particle's velocity turbulence, density distribution and relative velocity to the whole space. Simulation results show that the new type aerial dynamic field has such advantage as: well entrainment phenomena in the early period, and good mixing effects as: well entrainment phenomena in the early period, and good mixing effect in the later period, compared with the straight jets of the same velocity.