Photographic investigation into the mechanism of combustion in irregular detonation waves

Kiyanda, Charles B.; Higgins, Andrew

doi:10.1007/s00193-012-0413-8

Cited by 24 publications

(43 citation statements)

References 14 publications

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“…1b, one can see a significant amount of unburned pieces of gas at a considerable distance behind the leading shock front of the DW. The formation of these packages is in agreement with experimental observations (Subbotin, 1975;Kiyanda and Higgins, 2013). This phenomenon was not observed in simulations of regular mixtures based on hydrogen (Trotsyuk, 1999;Vasil'ev & Trotsyuk, 2003).…”

Section: Results Of Calculationssupporting

confidence: 86%

Numerical study of cellular detonation structures of methane mixtures

Trotsyuk

Fomin

Васильев

2015

Journal of Loss Prevention in the Process Industries

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Section: Results Of Calculationssupporting

confidence: 86%

Numerical study of cellular detonation structures of methane mixtures

Trotsyuk

Fomin

Васильев

2015

Journal of Loss Prevention in the Process Industries

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“…This was shown to be the case for regular detonations where the structure is well predicted by considering only the ignition delay history of a shocked particle, where transport mechanisms have been neglected (Edwards & Jones 1978). For irregular mixtures, many experiments (Kiyanda & Higgins 2013;Austin 2003;Strehlow 1968;Radulescu et al 2005;Subbotin 1975) have shown that a very different cell pattern exists. Typically, irregular mixtures correspond to hydrocarbon fuels with oxygen or air.…”

Section: Introductionmentioning

confidence: 95%

“…The PDF was then evaluated at δD = 0.2 intervals. Also shown in the figure, for comparison, is a PDF obtained from experimental data provided in Kiyanda & Higgins (2013) for an experiment at the same conditions, but for half of the channel height (H = 10). Here, 37 velocity data points are available, along the channel walls, to construct the PDF from one entire cell cycle.…”

Section: Statistical Analysis: Velocity Of the Wavementioning

confidence: 99%

“…The cell sizes are much more variable, and sometimes contain what appears to be cells within cells; a smaller cell structure within a much larger, and more prominent, cell structure. Furthermore, a number of experiments have shown the wave front to be highly turbulent, often giving rise to shocked unburned pockets of reactive fuel in its wake (Subbotin 1975;Kiyanda & Higgins 2013;Austin 2003;Radulescu et al 2005;Oran et al 1982). An example experiment (Radulescu et al 2007) for an irregular detonation wave, involving methane-oxygen, is shown in figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…As such, the numerical simulations have been validated to the experiments accordingly. Further validation has also been made through comparison to similar experiments (Kiyanda & Higgins 2013), which have also investigated irregular detonation propagation in methane-oxygen.…”

Section: Introductionmentioning

confidence: 99%

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Influence of turbulent fluctuations on detonation propagation

et al. 2017

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The present study addresses the reaction zone structure and burning mechanism of unstable detonations. Experiments investigated mainly two-dimensional methane-oxygen cellular detonations in a thin channel geometry. The sufficiently high temporal resolution permitted to determine the PDF of the shock distribution, a power-law with an exponent of -3, and the burning rate of unreacted pockets from their edges -through surface turbulent flames with a speed approximately 3-7 times larger than the laminar one at the local conditions. Numerical simulations were performed using a novel Large Eddy Simulation method where the reactions due to both auto-ignition and turbulent transport and treated exactly at the sub-grid scale in a reaction-diffusion formulation. The model is an extension of Kerstein & Menon's Linear Eddy Model for Large Eddy Simulation to treat flows with shock waves and rapid gasdynamic transients. The two-dimensional simulations recovered well the amplification of the laminar flame speed owing to the turbulence generated mainly by the shear layers originating from the triple points and subsequent Richtmyer-Meshkov instability associated with the internal pressure waves. The simulations clarified how the level of turbulence generated controlled the burning rate of the pockets, the hydrodynamic thickness of the wave, the cellular structure and its distribution. Three-dimensional simulations were found in general good agreement with the two-dimensional ones, in that the sub-grid scale model captured the ensuing turbulent burning once the scales associated with the cellular dynamics, where turbulent kinetic energy is injected, are well resolved.

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Effect of spatial inhomogeneities on detonation propagation with yielding confinement

Higgins

Kiyanda

et al. 2018

Shock Waves

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The propagation of detonation in layers of reactive gas bounded by inert gas is simulated computationally in both homogeneous and inhomogeneous systems described by the two-dimensional Euler equations with the energy release governed by an Arrhenius rate equation. The thickness of the layer is varied and the detonation velocity is recorded as the layer thickness approaches the critical value necessary for successful propagation. In homogeneous systems, as activation energy is increased, the detonation wave exhibits increasingly irregular cellular structure characteristic of the inherent multidimensional instability. The critical layer thickness necessary to observe successful propagation increases rapidly, by a factor of five, as the activation energy is increased from E a /RT 0 = 20 to 30; propagation could not be observed at higher activation energies due to computational limitations. For simulations of inhomogeneous systems, the source energy is concentrated into randomly positioned squares of reactive medium embedded in inert gas; this discretization is done in such a way that the average energy content and the theoretical Chapman-Jouguet (CJ) speed remains the same. In the limit of highly discrete systems with layer thicknesses much greater than critical, velocities greater than the CJ speed are obtained, consistent with our prior results in effectively infinite width sys-

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Photographic investigation into the mechanism of combustion in irregular detonation waves

Cited by 24 publications

References 14 publications

Numerical study of cellular detonation structures of methane mixtures

Numerical study of cellular detonation structures of methane mixtures

Influence of turbulent fluctuations on detonation propagation

Effect of spatial inhomogeneities on detonation propagation with yielding confinement

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