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http://dx.doi.org/10.3795/KSME-B.2012.36.2.197

Detonation Initiation via Surface Chemical Reaction of Laser-Ablated Aluminum Sample  

Kim, Chang-Hwan (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.)
Yoh, Jai-Ick (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.2, 2012 , pp. 197-204 More about this Journal
Abstract
We explore the evolution of metal plasma generated by high laser irradiances and its effect on the surrounding air by using shadowgraph images after laser pulse termination and X-ray diffraction (XRD) of aluminum plasma ablated by a high-power laser pulse (>1000 mJ/pulse) and oxygen from air. Hence, the formation of laser-supported detonation and combustion processes has been investigated. The essence of this paper is in observing the initiation of chemical reaction between the ablated aluminum plasma and oxygen from air by the high-power laser pulse (>1000 mJ/pulse) and in conducting a quantitative comparison of the chemically reactive laser-initiated waves with the classical detonation of an exploding aluminum (dust) cloud in air. The findings in this work may lead to a new method of initiating detonation from a metal sample in its bulk form without any need to mix nanoparticles with oxygen for initiation.
Keywords
Laser Ablation; Detonation; Powder Explosion; X-Ray Diffraction; High Irradiance Condition;
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