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Etude de la détonation de deux mélanges stoechiométriques (CH4/H2/O2/N2 et CH4/C2H6/O2/N2) Influence de la proportion relative des deux combustibles et de la température initiale élevée

Abstract : Detonations of gaseous reactive mixtures made of two fuels of very different detonability xH2+(1-x)CH4 and xC2H6+(1-x)CH4 in stoichiometric proportion with oxygen and diluted with nitrogen (in proportions varying from pure oxygen to the air) are investigated. The parameters of the study are the relative proportion x of fuels, nitrogen dilution B=O2/N2 and the initial conditions of temperature and pressure. This study takes place within the general context of the chemical process safety improvement. Detonability was evaluated by the comparison between the characteristic cell size measurement of the three-dimensional structure of the autonomous and stationary detonation front with the chemical induction length calculated on the assumptions of the ZND model by means of several detailed chemical kinetics mechanisms. The results obtained for the mixtures with single fuel show that the detonability of methane decreases according to the initial temperature whatever the dilution B, and that the one of ethane and hydrogen decreases with B=0 but increases with B=3,76 (air) (the inversion of behaviour occurs for B=2 for ethane, and B=1 for hydrogen). The results obtained for the mixtures with two fuels show that their detonability is each time influenced by the heaviest fuel, i.e. that the detonability of H2/CH4 mixtures is rather controlled by CH4 whereas the one of C2H6/CH4 mixtures is rather controlled by C2H6. With pure oxygen (B=0), these mixtures are desensitized by the increase of the initial temperature. Beyond a certain value x, an inversion of detonability according to x is observed.
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https://tel.archives-ouvertes.fr/tel-00010305
Contributor : Christophe Matignon <>
Submitted on : Tuesday, September 27, 2005 - 2:33:24 PM
Last modification on : Wednesday, March 6, 2019 - 1:02:09 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:16:40 PM

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  • HAL Id : tel-00010305, version 1

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Christophe Matignon. Etude de la détonation de deux mélanges stoechiométriques (CH4/H2/O2/N2 et CH4/C2H6/O2/N2) Influence de la proportion relative des deux combustibles et de la température initiale élevée. Energie électrique. Université de Poitiers, 2000. Français. ⟨tel-00010305⟩

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