Deflagration-to-detonation transition in gases in tubes with cavities

Смирнов, Н.Н.; Никитин, В. Ф.; Phylippov, Yu.G.

doi:10.1007/s10891-010-0448-6

Cited by 61 publications

(3 citation statements)

References 28 publications

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“…Deflagration-to-detonation transition (DDT) is a complex process involving turbulence, shock-flame interactions, shock collisions and reflections, and interactions of shocks with boundary layers. It is an important topic because DDT must be prevented in many cases [1,2] and optimized for specific applications [3][4][5]. DDT may be initiated by a number of different mechanisms that have been seen in both experiments and computations [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Shock transition to detonation in channels with obstacles

Goodwin

Houim

Oran

2017

Proceedings of the Combustion Institute

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Multidimensional numerical simulations of an unconfined, homogeneous, chemically reactive gas were used to study interactions leading to deflagration-to-detonation transition (DDT). The configuration studied was a long rectangular channel with regularly spaced obstacles containing a stoichiometric mixture of ethylene and oxygen, initially at atmospheric conditions and ignited in a corner with a small flame. The compressible reactive Navier-Stokes equations were solved by a high-order numerical algorithm on a locally adapting mesh. The initial laminar flame develops into a turbulent flame with the creation of shocks, shock-flame interactions, shock-boundary layer interactions, and a host of fluid and chemical-fluid instabilities. The final result may be eventual deflagration-to-detonation transition (DDT). Here two types of simulations are described, one with DDT occurring in a gradient of reactivity, which is common in the channels with higher obstacles, and another in which DDT arises from energy focusing as shocks converge. For the latter case, the rate of energy deposition necessary to initiate a detonation in the unburned gas is analyzed using a control volume analysis.

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Section: Introductionmentioning

confidence: 99%

Shock transition to detonation in channels with obstacles

Goodwin

Houim

Oran

2017

Proceedings of the Combustion Institute

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“…It has been reported that cavities can help realize detonation initiation through the DDT mechanism, and an increase in the number of cavities promotes DDT as long as the flame velocity leaving the last cavity does not exceed the sonic velocity [69] [70] .…”

Section: Cavity-based Initiationmentioning

confidence: 99%

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Two-dimensional reactive Euler equations with a detailed reaction modelwhere the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture.Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet.It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture.After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic Corresponding author. Email addresses: cai-chonger@hotmail.com, jhleon@vip.sina.com, r.deiterding@soton.ac.uk, linzy96@nudt.edu.cn, channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.

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“…Previously published works focus on deflagration-to-detonation transition of combustible gas-air mixtures Kessler et al, 2010;Liberman et al, 2010;Finigan et al, 2012;Brailovsky et al, 2011;Bychkov et al, 2012;Deshaies and Joulin, 1989;Dzieminska et al, 2012;Frolov, 2012;Gwak and Yoh Jack, 2013;Kagan, 2007;Kagan and Sivashinsky, 2010;Karlin, 2011;Lindstedt and Michels, 1989;Luebcke et al, 1996;Middha and Hansen, 2008;Obara et al, 1996Obara et al, , 2012Rakitin and Starikovskii, 2008;Smirnov et al, 2009Smirnov et al, , 2010Valiev et al, 2010;Vollmer et al, 2012) and air shock waves induced by explosion in a tunnel (Zhang et al, 2010. The mechanical behavior of a gas explosion in a long duct has been also investigated by many researchers (Hashimoto and Matsuo, 2007;Jo and Crowl, 2009;Marc et al, 2006;Trebinski and Wlodarczyk, 1986;Zipf et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Pressure and flow propagation rule beyond original premixed area of methane-air in tunnel

Zhang

2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose – Whether a fire can be initiated in an explosion accident depends on the explosion and deflagration process. In the methane-air explosion in a tunnel, the flame accelerates from the ignition point. However, where it begins to decelerate is not clear. The purpose of this paper is to examine the explosion overpressure, flow and flame propagation beyond the premixed area of methane-air in a tunnel. Design/methodology/approach – The numerical simulation was used to study the explosion processes of methane-air mixtures in a tunnel. Based on the numerical simulation and its analysis, the explosion overpressure, flow and flame propagation rules beyond the premixed area were demonstrated for a methane-air explosion. Findings – The peak overpressure of methane-air mixture explosion was observed to reach its maximum beyond the original premixed area of methane-air. The hazardous effects beyond the premixed area may be stronger than those within the premixed area for a methane-air explosion in a tunnel. Under the conditions of this study, the ratio between the length of combustion area (40 m) and that of original premixed area (28 m) reaches 1.43. Originality/value – Little attention has been devoted to investigating the explosion overpressure, flow and flam propagations beyond the original premixed area of methane-air in a tunnel. Based on the numerical simulation and the analysis, the propagation rule of overpressure wave and flow inside and outside the space occupied by methane/air mixture at the volume fraction of 9.5 percent in a tunnel were obtained in this work.

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Deflagration-to-detonation transition in gases in tubes with cavities

Cited by 61 publications

References 28 publications

Shock transition to detonation in channels with obstacles

Shock transition to detonation in channels with obstacles

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Pressure and flow propagation rule beyond original premixed area of methane-air in tunnel

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