Laser ablation ignition of flammable gas
Laser ablation ignition of flammable gas
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DOI：
10.35848/1347-4065/abed20
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发表时间：
2021-04
影响因子：
1.5
通讯作者：
E. Takahashi;S. Kato
中科院分区：
文献类型：
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作者：
E. Takahashi;S. Kato
为了降低激光点火所需的最小脉冲能量，从而降低激光装置的成本，实现相同激光能量下的多点点火，通过改变靶板与聚焦透镜之间的距离，结合纹影和直接色发射观测，研究了可燃气体激光烧蚀点火机理，其揭示了烧蚀靶材料和初始火焰核的行为。结果表明，除激光焦点靠近靶面外，烧蚀点火过程中的MPE与激光注量对靶的烧蚀阈值能量基本一致。在后一种情况下，观察到由激光击穿和初始火焰核与目标的连续碰撞引起的涡流。在这种情况下，MPE的增加是由初始火焰核中的热损失来解释的。
To reduce the minimum pulse energy required for laser ignition (MPE), thereby reducing the cost of the laser device and realizing multipoint ignition with the same laser energy, the ignition mechanism flammable gas using laser ablation was investigated by varying the distance between the target and the focusing lens, together with schlieren and direct color emission observation, which reveals the behavior of the ablative target material and initial flame kernel. It was found that the MPE in the ablative ignition was consistent with the ablation threshold energy of laser fluence on the target, except when the laser focal point was near the target surface. In this latter case, vortex flow induced by laser breakdown and successive collision of the initial flame kernel with the target was observed. The increase in MPE, in this case, was explained by heat loss in the initial flame kernel.