Abstract
The decay of a detonation wave in a \(\hbox {CH}_{4}+\hbox {2O}_{2}+\hbox {N}_{2}\) mixture propagating through a dust cloud is experimentally studied for three types of silica sand with particle sizes \(\delta =\) 250–600, 120–250, and 90–120 \(\upmu \hbox {m}\), mean volume densities \(\rho _{\mathrm{s}} =\) 2.2–3.5 g/l, and initial pressure \(p_{0} = \) 0.1–0.01 MPa. A non-monotonic character of reduction of wave velocity in the dust cloud is observed, where a secondary detonation can arise behind the leading front of the wave in the course of its attenuation. This situation is induced by the dual role of sand particles in decelerating the flow and simultaneously generating hot spots that promote reaction excitation. As a result, the mechanism of ignition in the decaying detonation wave becomes different. Critical parameters of the dust cloud providing complete suppression of the detonation wave and the flame propagating behind the latter at a reduced initial pressure of the gas mixture are determined.
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Communicated by G. Ciccarelli.
This paper is based on work that was presented at the 24th International Colloquium on the Dynamics of Explosions and Reactive Systems, Taipei, Taiwan, July 28–August 2, 2013.
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Pinaev, A.V., Vasil’ev, A.A. & Pinaev, P.A. Suppression of gas detonation by a dust cloud at reduced mixture pressures. Shock Waves 25, 267–275 (2015). https://doi.org/10.1007/s00193-014-0543-2
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DOI: https://doi.org/10.1007/s00193-014-0543-2