Dissipative Effects and Detonation in Dusty Media
O. V. Sharypov1,2
1Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2Novosibirsk State University, Novosibirsk, 630090 Russia
Keywords: dissipative properties of the gas suspension, chemically inert solid microparticles, suppression of instability in a reacting system, spatial structure of detonation
Abstract
The influence of phase interaction on the spatial structure of the detonation wave in dusty media is discussed. It is shown that dissipation of the energy of low-frequency acoustic perturbations in the gas phase may be drastically enhanced by the presence of minor fractions of small-size chemically inert solid particles and affect stability of perturbations with a scale comparable with the cell size of the gas detonation wave. A hypothesis is proposed that there exists an additional (dissipative) mechanism assisting in detonation suppression in the gas suspension owing to intense momentum transfer between the phases in an unsteady acoustic field in the reaction zone. Under certain conditions, this mechanism can substantially change the spectrum of unstable perturbations and attenuate spatial nonhomogeneity of the detonation wave at small energy expenses for acceleration and heating of particles. Owing to this fact, perturbation energy dissipation can affect the parameters and conditions of existence of the self-sustained detonation regime in the gas suspension.
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