This study investigates the mixing effects of primary and secondary jets on flame stability as fuel/air is injected into a bluff-body burner. A two-dimensional spray combustion model, based upon a SIMPLER method, is used for numerical studies of combusting flow. The influence of the jet-to-air velocity ratio on the recirculation zone behind the bluff body, the center axial velocity and the temperature profiles is studied in detail. The results show that mixing between the two jets is controlled by two vortex eddies on the inside and outside of the bluff-body. With a proper bluff-body blockage ratio, cone angle and jet-to-air velocity ratio a more stable flame can be achieved.