Abstract
We study the propagation of premixed flames in two-dimensional 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 devoted 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 with some details.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 321-339 |
| Number of pages | 19 |
| Journal | Combustion and Flame |
| Volume | 128 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 1 2002 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Physics and Astronomy(all)
Cite this
Influence of conductive heat-losses on the propagation of premixed flames in channels. / Daou, J.; Matalon, Moshe.
In: Combustion and Flame, Vol. 128, No. 4, 01.01.2002, p. 321-339.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of conductive heat-losses on the propagation of premixed flames in channels
AU - Daou, J.
AU - Matalon, Moshe
PY - 2002/1/1
Y1 - 2002/1/1
N2 - We study the propagation of premixed flames in two-dimensional 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 devoted 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 with some details.
AB - We study the propagation of premixed flames in two-dimensional 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 devoted 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 with some details.
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UR - http://www.scopus.com/inward/citedby.url?scp=0036123211&partnerID=8YFLogxK
U2 - 10.1016/S0010-2180(01)00362-5
DO - 10.1016/S0010-2180(01)00362-5
M3 - Article
AN - SCOPUS:0036123211
VL - 128
SP - 321
EP - 339
JO - Combustion and Flame
JF - Combustion and Flame
SN - 0010-2180
IS - 4
ER -