Numeric Calcul ation of aerodynamic behavior at the outlet of a dual passage swirl burner has been carried out

and many factors influencing upon the said behavior

such as the rate of primary and secondary air flow

angle of the swirl blade

angle of diffusing cone at centre of the burner

and expanding angle of the once-through secondary air jet etc. being analysed. The results are basically identical with those in cold-state model test. The recommended operational parameters and structural dimensions have significant reference value for testing

structure retrofitting

and operation of the said burner.