CFD Simulation of Stratified Fuel-Air Explosions (Contributo in atti di convegno)

Type
Label
  • CFD Simulation of Stratified Fuel-Air Explosions (Contributo in atti di convegno) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • F. S. Marra, G. Russo, E. Salzano, F. Tamanini (2002)
    CFD Simulation of Stratified Fuel-Air Explosions
    in The Second Mediterranean Combustion Symposium, Sharm El-Sheikh, Egypt, January 6-11, 2002
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F. S. Marra, G. Russo, E. Salzano, F. Tamanini (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IRC, Via Diocleziano 328, 80124 Napoli, Italy; Dipartimento di Ingegneria Chimica, Universit√† \"Federico II\", Napoli, Italy; CNR-IRC, Via Diocleziano 328, 80124 Napoli, Italy; Factory Mutual Research Corporation - Norwood, Massachusetts 02062, USA. (literal)
Titolo
  • CFD Simulation of Stratified Fuel-Air Explosions (literal)
Abstract
  • The explosion resulting from the ignition of the vapour cloud produced by a liquid spill generally involves only a fraction of the total volume of the enclosure. Beside the importance of this effect, no much work has been devoted to predict the correct amount of fuel contributing to the explosion strength. The aim of this work is to propose a numerical procedure for the simulation of the gas explosion of stratified mixtures by means of a computational fluid dynamic code. A laminar combustion model has been developed aiming at the numerical simulation of explosions in complex and large-scale configurations as industrial equipment or unconfined environment. Validation of the proposed model has been performed by comparisons of the results with available experimental data. Two configurations have been considered: a layered methane-air in a long channel and a stratified propane-air mixture in a closed environment. In these experiments, a premixed flame initially propagates through the portion of the layer with compositions between the lower and upper flammable limits. Then a diffusion flame in the rear part of the flame front and a convective flame close to the rich non flammable layer are observed. The calculated flame speeds are in agreement with the experiments. The calculated flow and flame structure are also well reproduced, at least qualitatively. In this preliminary work, only unvented test cases are considered whereas future work will address the evaluation of the effect of venting. Ultimately, the simulations are intended to quantify the contribution to the combustion process generated by the rich layer whose concentration is higher than the upper flammability limit, in terms of pressure rise within the combustion chamber. (literal)
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