Basic self-ignition regimes and conditions for their realization in combustible gas mixtures

Gel’fand, B. E.; Medvedev, S. P.; Polenov, A. N.; Khomik, S. V.; Bartenev, A. M.

doi:10.1007/bf02671908

Cited by 4 publications

(1 citation statement)

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“…The reflection of shock waves from shock tube end walls is a well-established method of initiation [3,4] and is the primary technique used to measure ignition delay times. Several studies have also shown that reflection of a planar incident shock wave from a concave end wall will focus the reflected wave [5][6][7][8], and that the temperatures and pressures at the gas-dynamic focus can be sufficient for initiation of the postshock mixture [9][10][11][12][13][14]. Toroidally imploding shock waves have also been directly initiated from ring sources [15].…”

Section: Previous Research On Imploding Wavesmentioning

confidence: 99%

Detonation Initiation in a Tube via Imploding Toroidal Shock Waves

Jackson

Shepherd

2008

AIAA Journal

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The effectiveness of imploding waves at detonation initiation of stoichiometric ethylene-and propane-oxygennitrogen 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.

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