Details

Autor(en) / Beteiligte

• DAOU, J
• MATALON, M

Titel

Influence of conductive heat-losses on the propagation of premixed flames in channels

Ist Teil von

• Combustion and flame, 2002-03, Vol.128 (4), p.321-339

Ort / Verlag

New York, NY: Elsevier Science

Erscheinungsjahr

2002

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We study the propagation of premixed flames in 2D channels accounting for heat-losses by conduction to the channel's walls and a prescribed Poiseuille flow. A diffusive-thermal model is used and the calculations reported are based on Arrhenius-type chemistry. Attention is focused on the influence of the magnitude of heat losses, the channel width, and the mean flow velocity. Special attention is given to the determination of the global burning rate and to extinction conditions. Depending on the channel width we discuss two possible modes of extinction: total flame extinction brought about in narrow channels by excessive losses, and partial flame extinction near the walls of wider channels. Our predictions of the quenching distance, namely, the smallest channel's width that permits flame propagation, and the dead space in the case of partial extinction are in agreement with experimentally reported values. The sensitivity of the flame to an imposed flow, being directed either towards the fresh mixture or towards the burned gas, is examined. (Author)