Abstract
The structure and stability of two-dimensional premixed flames in an idealized microcombustor are investigated numerically within the context of a diffusive-thermal model with an imposed flow field satisfying the Navier-Stokes equations. The combustible mixture flows in a straight channel with a bend at its end that forces the flow to turn back and reverts its direction. Heat exchange occurs near the bend along a segment of the wall separating the two opposing streams; the remaining walls are assumed adiabatic. Response curves identifying the dependence of the combustion characteristics on the mass flow rate illustrate the existence of multiple steady states for a certain range of the parameters with hysteresis and bi-stability phenomena. Stable solutions correspond to flames attached to the dividing wall, where intense heat exchange occurs, or stabilized by the flow near the front wall. Depending on the conditions, one or both solutions are physically possible. At high flow rates the flame is quenched by the flow.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3275-3284 |
| Number of pages | 10 |
| Journal | Proceedings of the Combustion Institute |
| Volume | 33 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 3 2011 |
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Keywords
- Flame stabilization
- Heat-recirculation
- Microcombustion
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry
Cite this
Analysis of an idealized heat-recirculating microcombustor. / Kurdyumov, Vadim N.; Matalon, Moshe.
In: Proceedings of the Combustion Institute, Vol. 33, No. 2, 03.02.2011, p. 3275-3284.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Analysis of an idealized heat-recirculating microcombustor
AU - Kurdyumov, Vadim N.
AU - Matalon, Moshe
PY - 2011/2/3
Y1 - 2011/2/3
N2 - The structure and stability of two-dimensional premixed flames in an idealized microcombustor are investigated numerically within the context of a diffusive-thermal model with an imposed flow field satisfying the Navier-Stokes equations. The combustible mixture flows in a straight channel with a bend at its end that forces the flow to turn back and reverts its direction. Heat exchange occurs near the bend along a segment of the wall separating the two opposing streams; the remaining walls are assumed adiabatic. Response curves identifying the dependence of the combustion characteristics on the mass flow rate illustrate the existence of multiple steady states for a certain range of the parameters with hysteresis and bi-stability phenomena. Stable solutions correspond to flames attached to the dividing wall, where intense heat exchange occurs, or stabilized by the flow near the front wall. Depending on the conditions, one or both solutions are physically possible. At high flow rates the flame is quenched by the flow.
AB - The structure and stability of two-dimensional premixed flames in an idealized microcombustor are investigated numerically within the context of a diffusive-thermal model with an imposed flow field satisfying the Navier-Stokes equations. The combustible mixture flows in a straight channel with a bend at its end that forces the flow to turn back and reverts its direction. Heat exchange occurs near the bend along a segment of the wall separating the two opposing streams; the remaining walls are assumed adiabatic. Response curves identifying the dependence of the combustion characteristics on the mass flow rate illustrate the existence of multiple steady states for a certain range of the parameters with hysteresis and bi-stability phenomena. Stable solutions correspond to flames attached to the dividing wall, where intense heat exchange occurs, or stabilized by the flow near the front wall. Depending on the conditions, one or both solutions are physically possible. At high flow rates the flame is quenched by the flow.
KW - Flame stabilization
KW - Heat-recirculation
KW - Microcombustion
UR - http://www.scopus.com/inward/record.url?scp=79251643802&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79251643802&partnerID=8YFLogxK
U2 - 10.1016/j.proci.2010.07.041
DO - 10.1016/j.proci.2010.07.041
M3 - Article
AN - SCOPUS:79251643802
VL - 33
SP - 3275
EP - 3284
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
SN - 1540-7489
IS - 2
ER -