Detonation properties of stoichiometric gaseous n-heptane/oxygen/argon mixtures |
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Authors: | B Imbert L Catoire N Chaumeix G Dupr C Paillard |
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Institution: | Laboratoire de Combustion et Systèmes Rèactifs (LCSR), CNRS and University of Orleans, 1C, av. de la Recherche Scientifique, F-45071 Orléans Cedex 02, France |
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Abstract: | A study of detonation velocity and cellular structure for stoichiometric heptane/oxygen and for some stoichiometric heptane/oxygen/argon mixtures is carried out in a shock tube at low initial pressure. The critical conditions for the detonation onset and for the propagation of a self-sustained detonation wave are determined. A simplified form of the ZND model used in conjunction with a validated detailed kinetic model leads to the determination of the proportionality factor, A, between the detonation cell width, λ, and the induction distance, Δ, in the detonation wave. This A factor is of practical importance to estimate the detonation properties of n-heptane based mixtures including n-heptane/air. The prediction of detonation cell size λ for n-heptane based mixtures is discussed according to the recent semi-empirical detonation model of Gavrikov et al. The cell sizes predicted according to this detonation model are underestimated by a factor of about 8. The limitations of this model are underlined when applied to n-heptane based mixtures. |
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Keywords: | Detonation Heptane Detonation structure PDE |
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