Distinctive features of galloping detonation in a supersonic combustible-mixture flow under an inert gas layer |
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Authors: | V A Levin I S Manuilovich V V Markov |
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Abstract: | The problem of detonation initiation in a supersonic flow of a stoichiometric propane-air mixture occupying partially or completely
the cross-section of a plane channel is considered. The initiation in the flow is produced by a step or a wall completely
cutting off the flow. The study is conducted within the framework of one-stage combustion kinetics. A numerical method based
on the Godunov scheme is employed. The critical conditions for detonation formation are determined in terms of the oncoming
flow velocity. A previously unknown mechanism of detonation propagation is found; it is related with the presence of the combustible
mixture in the wall layer under an inert gas layer. It is due to the formation of a complicated wave structure of the flow
characterized by the penetration of a shock wave formed in the inert gas layer into a combustible mixture layer ahead of the
detonation wave with the result that the latter layer is heated and ignited. The process as a whole is periodic in nature,
as distinct from the conventional cellular detonation in a homogeneous fluid. Many problems arise in connection with the use
of detonation in engines and other power plants. The most important among them are detonation excitation and stabilization
in combustion chambers. The detonation initiation within a layer under conditions of unbounded space and a fluid at rest was
experimentally investigated in 1]. In the case of a combustion chamber bounded in the transverse direction, some new effects
accompanying the detonation might be expected. |
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