Abstract
A vortex ring is easily produced by pushing fluid through a circular orifice. If the vortex ring interacts with a diffusion flame, a local extinction occurs. In order to use a vortex ring for fire fighting, we have investigated the characteristics of the air vortex ring extinguishment of a methane-air jet diffusion flame. From the blowout experiments, we calculated probability of the vortex ring blowout and measured displacement speed of the vortex ring. As a result, when the air vortex ring impacts with the flame base zone of the jet diffusion flame at the displacement speed enough to generate a local extinction, the whole flame can be extinguished.
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