レーザブレークダウンを応用した最小点火エネルギー計測に対するレーザパルス幅の影響(熱工学,内燃機関,動力など)

概要

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The absorption energy to plasma formed by laser breakdown was measured with lasers which had different laser pulse durations (24 ps, 150 ps, 300 ps, 5 ns). The scattered energy from plasma at focus was considered. In consequence, the scattered energy from plasma was become larger, when the laser of which pulse was shorter than several nanosecond was used. Furthermore, Minimum ignition energy were measured on the methane-air pre-mixture using the laser ignition technique with different pulse duration-s (24 ps, 150 ps, 5 ns). Minimum ignition energy was estimated from absorption energy which was measured considering scattered energy from plasma. It was found that minimum ignition energies which were measured by the lasers that had any laser pulse duration had no differences but not what was suggested formerly.
社団法人日本機械学会の論文
2007-03-25