A study on the interaction between local flow and flame structure for mixing-controlled Diesel sprays

Abstract : A detailed study on the spray local flow and flame structure has been performed by means of PIV and laser-sheet LIF techniques under Diesel spray conditions. Operating conditions were based on Engine Combustion Network recommendations. A consistent comparison of inert and reacting axial velocity fields has produced quantitative information on the effect of heat release on the local flow. Local axial velocity has been shown to increase 50 to 60% compared to the inert case, while the combustion-induced radial expansion of the spray has been quantified in terms of a 0.9 to 2.1 mm radius increase. As a result, the drop in entrainment rate has been quantified around 25% compared to the inert case. Streamline analysis also hints at a reduced entrainment under reacting conditions. A 1D spray model under reacting condition has been used, which confirms the modifications obtained in the main flow metrics when moving from inert to reacting conditions. When comparing the flow evolution with the flame structure, little effect of chemical activity on the spray flow upstream the lift-off length has been evidenced, in spite of the presence of formaldehyde in such regions. Only downstream of the lift-off length, as defined by OH LIF, has a strong change in flow pattern been observed as a result of combustion-induced heat release.
Type de document :
Article dans une revue
Combustion and Flame, Elsevier, 2017, 179, pp.157 - 171. 〈10.1016/j.combustflame.2017.01.023〉
Liste complète des métadonnées

https://hal-ifp.archives-ouvertes.fr/hal-01566130
Contributeur : Françoise Bertrand <>
Soumis le : jeudi 20 juillet 2017 - 16:13:45
Dernière modification le : mardi 15 mai 2018 - 14:50:03

Fichier

2017_CF_ReactiveFlowStructure_...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

IFP

Citation

José García-Oliver, Louis-Marie Malbec, Hubert Baya Toda, Gilles Bruneaux. A study on the interaction between local flow and flame structure for mixing-controlled Diesel sprays. Combustion and Flame, Elsevier, 2017, 179, pp.157 - 171. 〈10.1016/j.combustflame.2017.01.023〉. 〈hal-01566130〉

Partager

Métriques

Consultations de la notice

45

Téléchargements de fichiers

65