Strange wave formation and detonation onset in narrow channels

Ballossier, Yves; Virot, Florent; Melguizo-Gavilanes, J.

doi:10.1016/j.jlp.2021.104535

Cited by 17 publications

(5 citation statements)

References 14 publications

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“…These observations provide further evidence of the role played by walls on DO, most probably through the formation of favorable thermal gradients [51,52] due to friction induced heating within the hydrodynamic boundary layer [23,25,53]. The formation of ignition centers within corners was conclusively confirmed by our results in line with recent experiments [26]; the spatial distributions measured do not therefore seem to be facility dependent.…”

Section: Spatial Distributions On Channel's Cross Sectionsupporting

confidence: 91%

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Flame acceleration and detonation onset in narrow channels: Simultaneous schlieren visualization

Ballossier

Virot

Melguizo-Gavilanes

2023

Combustion and Flame

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Section: Spatial Distributions On Channel's Cross Sectionsupporting

confidence: 91%

“…The combustion chamber and optical setup allowing simultaneous schlieren visualization were improved based on the learnings from the experimental campaign presented in [26].…”

Section: Methodsmentioning

confidence: 99%

Flame acceleration and detonation onset in narrow channels: Simultaneous schlieren visualization

Ballossier

Virot

Melguizo-Gavilanes

2023

Combustion and Flame

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“…The high surface area of this porous material ensures that the explosion flame can make sufficient contact with the material when it propagates into the pore spaces, which enables the explosion flame to transfer more heat to the pore structure [42,43] and reduce the temperature of the flame. The combustion reaction cannot propagate to the unreacted area, and the flame is extinguished [44][45][46]. In addition to flame quenching, porous media also have a significant attenuation effect on pressure waves.…”

Section: The Suppression Mechanism Of Porous Materials In Gas Explosionsmentioning

confidence: 99%

Exceptional Performance of Flame-Retardant Polyurethane Foam: The Suppression Effect on Explosion Pressure and Flame Propagation of Methane-Air Premixed Gas

Li,

Zhang,

Yuan

2023

Materials

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A self-built gas explosion testing platform was used to explore the quenching effect of flame-retardant polyurethane foam on a gas explosion. The effect of the foam’s filling position and length on the explosion suppression performance was explored. The results demonstrate that polyurethane foam exhibits an excellent flame-quenching performance, with a minimum of a 5 cm length of porous material being sufficient to completely quench the flame during propagation. Furthermore, the attenuation function of this porous material on the pressure wave is insignificantly affected by the change in ignition energy. Compared with the explosive state of the empty pipeline, the best suppression effect is obtained when the polyurethane foam is 20 cm in length with a filling position at 1.8 m, and the maximum explosion pressure and maximum rise rate are attenuated by 86.2% and 84.7%, respectively. This work has practical significance for the application of porous materials in explosion suppression and explosion-proof technologies in the chemical industrial processing and oil (gas) storage fields.

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“…The transition from a subsonic deflagration to a supersonic detonation wave can be achieved through different scenarios, involving interactions of flames with shocks, boundary layers, instabilities or turbulence. These issues have been extensively studied over the past decades, since at least the work of Meyer, Urtiew, and Oppenheim 1 and are still the subject of numerous recent works [2][3][4][5] . The physics of Deflagration to Detonation Transition (DDT) is extremely rich (see seminal review of Oran and Gamezo 6 or textbooks 7,8 ) and a variety of mechanisms have been revealed in industrial applications, such as engines, mines, and also in natural phenomenon, such as explosions of supernova 9 .…”

Section: Introductionmentioning

confidence: 99%

A canonical numerical experiment to study detonation initiation from colliding subsonic auto-ignition waves

et al. 2023

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The collision of two subsonic auto-ignition fronts with initial constant velocity was found to transit to detonation only when the collision angle was acute. The interaction of the reactive phase wave with inert hot layers constituted a singularity providing a continuous source of vorticity due to barocline effect. For an acute angle, this singularity that propagated at supersonic speed induced oblique pressure waves, of which resonance, due to the reactivity gradient geometry, near the center of the channel in the fresh gases accelerated the reactive wave fronts until transition to detonation. The numerical results of the present study, even if based on drastic assumptions, were at least in good qualitative consistency with experiments. The geometry of the reactivity gradients can thus provide another seed for the coupling between gas dynamics and heat release. Continuous pressure fluctuations and oblique shocks coming from vorticity sources and sheets from barocline effects can considerably enhance this transition. This path to transition could be complementary to that invoking mixing burning within premixed non-planar turbulent flame brush.

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Strange wave formation and detonation onset in narrow channels

Cited by 17 publications

References 14 publications

Flame acceleration and detonation onset in narrow channels: Simultaneous schlieren visualization

Flame acceleration and detonation onset in narrow channels: Simultaneous schlieren visualization

Exceptional Performance of Flame-Retardant Polyurethane Foam: The Suppression Effect on Explosion Pressure and Flame Propagation of Methane-Air Premixed Gas

A canonical numerical experiment to study detonation initiation from colliding subsonic auto-ignition waves

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