Detonation initiation in a tube via imploding toroidal shock waves

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作者：
Jackson, S.I. [1 ,2 ]
Shepherd, J.E. [1 ,3 ,4 ]
机构：
[1] California Institute of Technology, Pasadena, CA 91125, United States
[2] Shock and Detonation Physics, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
[3] Department of Aeronautics, MC 105-50
[4] AIAA
来源：
| 1600年 / American Institute of Aeronautics and Astronautics Inc.卷 / 46期
关键词：
The effectiveness of imploding waves at detonation initiation of stoichiometric ethylene- and propane-oxygen-nitrogen mixtures in a tube was investigated. Implosions were driven by twice-shocked gas located at the end of a shock tube; and wave strength was varied to determine the critical conditions necessary for initiation as a function of diluent concentration for each fuel. Hydrocarbon-air mixtures were not detonated due to facility limitations; however; detonations were achieved with nitrogen dilutions as large as 60 and 40% in ethylene and propane mixtures; respectively. The critical-energy input required for detonation of each dilution was then estimated using the unsteady energy equation. Blast-wave initiation theory was reviewed and the effect of tube wall proximity to the blast-wave source was considered. Estimated critical energies were found to scale better with the planar initiation energy than the spherical initiation energy; suggesting that detonation initiation was influenced by wave reflection from the tube walls. Copyright © 2008 by California Institute of Technology;
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Conference article (CA)
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