http://www.cnr.it/ontology/cnr/individuo/prodotto/ID89887
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
- 2003-01-01T00:00:00+01:00 (literal)
- Alternative label
Orlando F., Marra F.S., Salzano E., Russo G. (2003)
CFD simulation of stratified fuel-air explosions
in 4th International Seminar On Fire And Explosion Hazards, Londonderry-UK, September 8-12, 2003
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Orlando F., Marra F.S., Salzano E., Russo G. (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
- Fire and Explosion Hazards: Proceedings of the Fourth International Seminar (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Ingegneria Chimica, Università di Napoli \"Federico II\", Italia;
IRC-CNR, Italia (literal)
- Titolo
- CFD simulation of stratified fuel-air explosions (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
- Derek Bradley, Dougal Drysdale, Vladimir Molkov (literal)
- Abstract
- The analysis of consequences of gas explosions is often performed by considering \"worst case\"
conditions, i.e. when the flammable gas forms a homogenous stoichiometric mixture. Actually,
following the initial dispersion, it is very likely that a stratified mixture is formed where large part of
the fuel forms rich or lean mixtures, within or outside the flammability limits.
The few models presented in the literature were based on simple gas-dynamic considerations, aiming
to furnish the explanation for the observed larger speed of the flame front with respect to the nominal
burning velocity. None of them take into account either the different combustion regimes behind the
flame front or the concentration gradient itself. These aspects could be predicted by more advanced
numerical tools as Computational Fluid Dynamics. However the adoption of very large cell size is
mandatory for the description of the explosion behavior in medium and large-scale environment, with
the need to introduce a sub-grid model for the combustion.
A \"front capturing\" model for the premixed laminar combustion front, propagating in a layered
mixture, has been then developed. The model is based on an in-cell reconstruction procedure from the
knowledge of the cell average values. Simulation results compare satisfactory with experimental data
obtained for a medium scale combustion chamber. The ability of the code to reproduce the flame
speed, by varying the filling ratio along the height, has been proven even adopting very coarse grid. (literal)
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