Modeling of Cellular Structure of Detonation Wave in Binary Methane-Hydrogen Mixture
A. V. Trotsyuk, P. A. Fomin
Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: dual-fuel mixture, methane, hydrogen, kinetic model, detonation, numerical calculation, multi-front structure, detonation cell, irregular structure
Abstract
A generalized two-stage model of chemical kinetics of detonation combustion of a binary stoichiometric mixture of methane with hydrogen and air is proposed. It allows calculating the heat release of the chemical reaction, the molar mass, the internal energy and the adiabatic index of the mixture without calculating its detailed chemical composition, which significantly simplifies kinetic calculations and reduces their volume compared to detailed kinetics. The model is physically substantiated and does not contain adjustable parameters. For the mixture under consideration, a numerical two-dimensional calculation of the multifront structure of the detonation wave was made with a variation in the ratio between the combustibles. Chemical transformations were described using the proposed kinetic model. The calculated size of the detonation cell, as well as the qualitative structure of the detonation wave (the presence of regions of unburned gas in the reaction zone and the irregularity of the cellular structure caused by the formation of both primary and secondary transverse waves) are in good agreement with the experiment.
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