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1 2009

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Cellular structure of detonation wave for hydrogenmethane-air mixtures

Porowski R., Teodorczyk A.

Materiały Wysokoenergetyczne

2009

T. 1

30--41

Paper presents a computational study of the fundamental detonation parameters of stoichiometric hydrogen-methane-air mixtures based on Chapman-Jouguet theory, ZND model and detonation wave cell size calculations. Detonation wave of gaseous fuel-air mixture has a multidimensional cellular structure consisting of cellular pattern that could be experimentally determined using smoked foil. The width of detonation cell correlates with several detonation dynamic parameters, e.g. initiation energy or critical tube diameter, and also reflects the stability of detonation wave. Methane-hydrogen mixture is used at different combustion devices like spark ignited engines, gas turbines, different kind of burners with premixed and diffusion flames. Series of calculations on detonation parameters of stoichiometric hydrogen-methane-air mixtures were made with different H2 contents in the mixture, from 10% up to 100% of hydrogen. The effects of the initial composition of the mixtures as well as initial pressure on the detonation velocity and cell size were investigated.