Study on Laser Induced Ignition for Methane-Air Mixtures with Pico-Second Pulse Duration Laser

概要

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Ignition by using a laser-induced breakdown (Laser-induced ignition) is considered as a new approach to control the ignition phenomena. It is known that the laser-induced ignition is affected by characteristics of the laser source. In this study, effects of the pico-second order pulse duration of laser source on laser induced ignition phenomena of methane-air lean premixed gas are examined experimentally. Plus durations of laser and conditions of initial gaseous pressure are varied for investigating the effects of laser duration time on Laser-induced ignition. Results clearly show that the minimum ignition energy decreases with increasing the initial pressure. This tendency is same as the previously reported results by using the laser which has nano-second order pulse duration. On the other hand, there is little difference in the minimum pulse energy for ignition with the difference of laser pulse duration time.