Accurate Measurements and Analysis of the Thermal Structure of Turbulent Methane/Air Premixed Flame

Levenţiu, Constantin; Renou, Bruno; Dănăilă, Sterian; Isvoranu, Dragoş

doi:10.1016/j.egypro.2015.12.259

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Therefore, the fireball is expanding in three dimensions and this phenomenon is observed in the images of 10 g sample case. In addition to the shock waves [15][16][17], the rarefaction waves can also disperse dust particles to wide-area.…”

Section: Resultsmentioning

confidence: 99%

Turbulent flame propagation in corn dust clouds formed in confined and open spaces

Cheeda

2020

SN Appl. Sci.

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Flame propagation stages in a corn dust cloud in a large room size confinement investigated. The clouds ignited by a weak heat source. The mass of the dust identified to be influenced the flame acceleration. Dust in the clouds burnt rapidly through several fluid dynamic mechanisms. Four types of instabilities contributed to fast flame development. Landau-Darrieus and Kelvin-Helmholtz instabilities increased the flame speed in the initial stages of the fireball. In the intermediate and final stages, corrugated and the wrinkled flame structure originated through Rayleigh-Taylor instabilities. In addition to flow aspects and instabilities, the shock waves also enhanced the flame speed. The shock overpressure measured with a dynamic pressure sensor. These shock waves induced Richtmyer-Meshkov instability in the fireball and developed turbulent flames. Density gradients across the fireball (due to higher temperature gradients) caused perturbations. Further, this gradient increased by the shock waves. The crosswind speed through the confinement windows was slower, therefore it has not enhanced the flame speed. Corn dust dispersed quickly to a wider area by the shock waves, established large dust clouds, and lead to explosions. The maximum surface temperature of the fireball predicted as 1384 K. The preheat zone around the fireball identified by an image processing tool. The turbulence parameters at the fireball obtained from qualitative and quantitative methods and analyzed. The clouds of a small quantity of corn dust lead to the formation of larger fireballs due to higher kinematic viscosity than the energy dissipation rate. Keywords Dust cloud explosion • Hydrodynamic instability in dust cloud explosions • Turbulent flame • Fire accidents and Fire safety List of symbols LDI (DLI) Landau-Darrieus instability also referred to as Darrieus-Landau instability KHI Kelvin-Helmholtz instability RTI Rayleigh-Taylor instability RMI Richtmyer-Meshkov instability DAQ Data acquisition system FPS Frames per second R e Reynolds number D a Damköhler number K a Karlovitz number p D Dynamic pressure Fluid density u ′ Turbulent intensity, velocity component L T Integral turbulent length scale L

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Section: Resultsmentioning

confidence: 99%

Turbulent flame propagation in corn dust clouds formed in confined and open spaces

Cheeda

2020

SN Appl. Sci.

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“…A decreasing of averaged temperature gradient was observed for turbulent combustion case. The results show that the flame front thickness PDF and the curvature PDF decrease with the turbulence intensity [20]. More recently, a work using Mie scattering on lean premixed methane Bunsen flames has investigated the interactions between turbulence and the flame front.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the dynamic field of turbulent premixed methane/air flame using PIV technique

Boulahlib¹,

Chekired²,

Benzitouni³

et al. 2016

Int. J. CMEM

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This work is an experimental study of the dynamic fields of a turbulent premixed methane-air flame in a Bunsen burner. The Particle Image Velocimetry (PIV) is used to determine the dynamic fields, and Laser Sheet Tomography (LST) for the flame fronts. The turbulent main jet has a Reynolds number Re = 10 000. Turbulence is generated using perforated grids having three whose provide different inlet turbulence intensities. Velocity fields are measured for various equivalence ratio (F = 0.6-1.3) and different axial flame positions. For the reactive jet, interesting results are obtained concerning the dynamic field and the flame front. It is shown that radial profiles of U and V correspond to the axial positions located before the end of the potential core in the reactive jet. The velocity increases at the jet center to 20 m/s, and is less influenced by turbulent mixing in the flame. The greatest velocity and turbulent kinetic energy are obtained using the grid with the smallest ratio (d/M). Most important values of the radial velocity correspond to the lean flames.

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Premixed flames subjected to extreme levels of turbulence part I: Flame structure and a new measured regime diagram

Skiba

Wabel

Carter

et al. 2018

Combustion and Flame

140

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Accurate Measurements and Analysis of the Thermal Structure of Turbulent Methane/Air Premixed Flame

Cited by 3 publications

References 22 publications

Turbulent flame propagation in corn dust clouds formed in confined and open spaces

Turbulent flame propagation in corn dust clouds formed in confined and open spaces

Experimental study of the dynamic field of turbulent premixed methane/air flame using PIV technique

Premixed flames subjected to extreme levels of turbulence part I: Flame structure and a new measured regime diagram

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