Abstract
We have succeeded to extinguish a diffusion flame formed over a PMMA plate using laser ablation. When a pulsed laser beam is focused tightly on a solid surface, laser ablation occurs and a hemispherical blast wave and a high-speed flow behind its wave front are generated. Flame base which dominates the stability of a diffusion flame, can be blown out by the blast wave and high speed flow due to laser ablation. A single mode, Q-switched Nd : YAG laser (wavelength : 532 nm) is used, and produces a laser pulse with energy of 200 mJ. The laser beam is focused on a PMMA surface with a 100 mm-focal-length lens. We have investigated the characteristics of the laser-ablation extinguishment of a diffusion flame spreading over a PMMA plate. Probability of success of laser-ablation extinguishment is measured by varying flame base width and flame height of the diffusion flame. From the results, the laser extinguishment limits for flame height and flame base width, in which the spreading diffusion flame is blown out perfectly by the laser ablation are clarified.
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