Abstract
To clarify the stabilization mechanism of coaxial oxygen-jet diffusion flames, experiments on the measurement of flame base position and stream lines near the burner lip were performed. It was found that, at high pressure, flame base located in the recirculation zone near the lip, while, at atmospheric pressure, it located downstream of the recirculation zone. This means that the stabilization of the flame base at high pressure is dominated by the existence of the recirculation zone and that at atmospheric pressure is determined by the balance between the local gas velocity and burning velocity of the premixed gas formed by diffusion. Therefore, the stabilization mechanism changes depending on the ambient pressure.
