Combustion effects in confined explosions

Kuhl, A. L.; Reichenbach, H.

doi:10.1016/j.proci.2008.05.001

Cited by 34 publications

(12 citation statements)

References 5 publications

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“…This seems to be an inherent property of such spherical mixing layers. This contrasts with confined combustion in calorimeters, where fuel consumption was more that 90 % for the same fuels [1,2,3] as a result of the continued mixing induced by shock reverberations in the chamber. …”

Section: Discussionmentioning

confidence: 89%

“…The fuel-air interface is unstable and rapidly evolves into a turbulent mixing layer. The hot detonation products and the shock-heated air serve as ultra-strong ignition sources of the fuel-air mixture, which evolves into a spherical combustion cloud [1,2]. The evolution of the blast wave and ensuing combustion cloud dynamics are studied via numerical simulations with our two-phase Adaptive Mesh Refinement (AMR) combustion code [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Spherical combustion clouds in explosions

et al. 2012

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Spherical combustion clouds in explosions

et al. 2012

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“…Experimental results for 1.5-g composite PETN/TNT charges and PETN/Al charges were published in the 32 nd Int. Combustion Symposium [1]. Here we describe numerical modeling of those experiments.…”

Section: )mentioning

confidence: 99%

Gasdynamic model of turbulent combustion in TNT explosions

Kuhl

Bell

Beckner

et al. 2011

Proceedings of the Combustion Institute

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A model is proposed to simulate turbulent combustion in confined TNT explosions. It is based on: (i) the multi-component gasdynamic conservation laws, (ii) a fast-chemistry model for TNT-air combustion, (iii) a thermodynamic model for frozen reactants and equilibrium products, (iv) a high-order Godunov scheme providing a non-diffusive solution of the governing equations, and (v) an ILES approach whereby adaptive mesh refinement is used to capture the energy bearing scales of the turbulence on the grid. Three-dimensional numerical simulations of explosion fields from 1.5-g PETN/TNT charges were performed. Explosions in six different chambers were studied: three calorimeters (volumes of 6.6-l, 21.2-l and 40.5-l with L/D = 1), and three tunnels (L/D = 3.8, 4.65 and 12.5 with volumes of 6.3-l)-to investigate the influence of chamber volume and geometry on the combustion process. Predicted pressures histories were quite similar to measured pressure histories for all cases studied. Experimentally, mass fraction of products, ! Y P exp , reached a peak value of 88% at an excess air ratio of twice stoichiometric, and then decayed with increasing air dilution; mass fractions ! Y P calc computed from the numerical simulations followed similar trends. Based on this agreement, we conclude that the dominant effect that controls the rate of TNT combustion with air is the turbulent mixing rate; the ILES approach along with the fast-chemistry model used here adequately captures this effect.

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“…In the past, we have studied turbulent combustion effects in both confined [1,2] and unconfined [3] explosions. And we have proposed gasdynamic models [4] and heterogeneous continuum models [5] for the turbulent combustion fields.…”

Section: Introductionmentioning

confidence: 99%

Turbulent combustion in aluminum-air clouds for different scale explosion fields

Kuhl

Balakrishnan

Bell

et al. 2017

AIP Conference Proceedings

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Abstract. This paper explores "scaling issues" associated with Al particle combustion in explosions. The basic idea is the following: in this non-premixed combustion system, the global burning rate is controlled by rate of turbulent mixing of fuel (Al particles) with air. From similarity considerations, the turbulent mixing rates should scale with the explosion length and time scales. However, the induction time for ignition of Al particles depends on an Arrhenius function, which is independent of the explosion length and time. To study this, we have performed numerical simulations of turbulent combustion in unconfined Al-SDF (shock-dispersed-fuel) explosion fields at different scales. Three different charge masses were assumed: 1-g, 1-kg and 1-T Al-powder charges. We found that there are two combustion regimes: an ignition regime-where the burning rate decays as a power-law function of time, and a turbulent combustion regimewhere the burning rate decays exponentially with time. This exponential dependence is typical of first order reactions and the more general concept of Life Functions that control the dynamics of evolutionary systems. Details of the combustion model are described. Results, including mean and rms profiles in combustion cloud and fuel consumption histories, are presented.

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Combustion effects in confined explosions

Cited by 34 publications

References 5 publications

Spherical combustion clouds in explosions

Spherical combustion clouds in explosions

Gasdynamic model of turbulent combustion in TNT explosions

Turbulent combustion in aluminum-air clouds for different scale explosion fields

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