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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Laser Extinguishment of CH_4-N_2/Air Counterflow Diffusion Flame
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Laser Extinguishment of CH_4-N_2/Air Counterflow Diffusion Flame

机译：CH_4-N_2 /空气逆流扩散火焰的激光熄灭

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摘要

We have examined the laser extinguishment of a CH_4-N_2/Air counterflow diffusion flame. Laser extinguishment is to blow off flames by a laser-induced breakdown. A Q-switched Nd:YAG laser (energy; 200 mJ/pulse) and a 100-mm focal-length lens were used. The laser-extinguishment probabilities were examined by varying the fuel concentration and the distance from the breakdown point to the flame. As a result, the two concentration limits were clarified. One was the laser extinguishable limit, below which the flame could be extinguished perfectly by laser. The other was the laser inextinguishable limit, over which any flame could not be extinguished. Moreover, it was considered that determination of the laser extinguishable limit was mainly influenced by the laser-induced blast wave. On the other hand, it could be considered that not only the blast wave but also hot gas and turbulence due to the optical breakdown influenced the determination of the laser inextinguishable limit.
机译：我们已经检查了CH_4-N_2 /空气逆流扩散火焰的激光熄灭。激光熄灭是通过激光引起的击穿来扑灭火焰。使用Q开关Nd：YAG激光（能量； 200 mJ /脉冲）和100 mm焦距镜头。通过改变燃料浓度和击穿点到火焰的距离来检查激光的熄灭概率。结果，澄清了两个浓度极限。一种是激光可熄灭极限，在该极限以下，可以通过激光完全熄灭火焰。另一个是激光无法熄灭的极限，在该极限上无法熄灭任何火焰。此外，可以认为确定激光可熄灭极限主要受激光诱发的爆炸波的影响。另一方面，可以认为不仅是爆炸波，而且由于光学击穿所引起的热气体和湍流也影响了激光不可熄灭极限的确定。

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