Effect of Electric Field on Structure of Premixed Bluff-body Swirl Flames

In this paper, the influence of direct current electric field on the flame structure of a lean premixed bluff-body swirl burner is studied. When the electric field is applied, the flame front moves upstream and the angle between the flame surfaces increases. The electric field can increase the wrinkling ratio of the upper part of the bluff body swirling flame, thus increasing the turbulent flame speed. However, it has no obvious effect on the structure of the flame surface at the root. The electric field has no obvious effect on the maximum flame surface density, but increases the turbulent flame speed by increasing the thickness of the flame brush. The equivalence ratio of premixed gas and the average velocity of burner outlet can affect the electric field strength. The decrease of equivalence ratio and increase of the exit average velocity will reduce the effect of electric field. The effect of electric field on the root of bluff body swirl flame is weak, and the effect of electric field on the hydrodynamics is weak near the blow off condition, which has no obvious effect on the blow off limit for bluff body swirl flame.