Schlieren visualization of blast extinguishment with laser-induced breakdown
Schlieren visualization of blast extinguishment with laser-induced breakdown
复制标题
DOI：
10.1016/j.proci.2016.06.131
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Torikai;Y. Soga;A. Ito
中科院分区：
文献类型：
--
作者：
H. Torikai;Y. Soga;A. Ito
特大地震发生后，往往会同时发生多起火灾。作者提出将爆炸灭火作为灾后火灾的应急灭火技术和减轻损失的措施。但是，爆炸压裂的井喷机理至今尚未完全阐明。为了阐明爆炸熄灭的机理，利用激光诱导空气击穿产生的爆炸波对扩散火焰进行了熄灭实验，并利用纹影技术对火焰熄灭过程进行了可视化观察。由实验结果发现，当破裂点位于驱动冲击波的热气泡与火焰底部相互作用的位置时，其灭火效果比冲击波仅作用于火焰时要大。
After occurrence of a very large scale earthquake, multiple simultaneous fires often break out. The author proposes to use blast extinguishment as an emergency firefighting technique and damage mitigation measure for post-disaster fires. However, the blowout mechanism of blast extinguishment has not been made clear yet. In the present study, in order to clarify the blowout mechanism of blast extinguishment, extinguishing experiments of a diffusion flame have been performed with a blast wave produced by laser-induced air breakdown, and the extinguishing processes have been visualized using the schlieren technique. From the experimental results, it is found that when the breakdown point is placed at the position where the hot gas bubble driving the blast wave interacts with the flame base, its extinguishing effectiveness becomes larger than when the blast wave only affects the flame.