Abstract
We have carried out experiments on the ignition of hydrogen-oxygen-argon mixtures with an ArF excimer laser as an ignition light source to study the phenomena of ignition and flame growth by using high-speed shadowgraphy and a spectroscopic analyzer, and to evaluate the minimum incident laser energy necessary for ignition under various mixture conditions. A series of shadowgraphs indicated that ignition occurred in the laser focal area. The flame growth speed was greater in the laser axis direction than in the perpendicular direction, and the difference increased with the laser energy. We confirmed that the laser light irradiation induces the ignition and augments the initial flame growth. The results of spectroscopic analysis showed that no strong plasma was generated in the laser focal area. The minimum incident laser energy has a linear relationship with the reciprocal of oxygen partial pressure within the experimental range. These results indicate that the photodissociation of oxygen molecules into oxygen atoms plays an important role in the ignition process.
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