Abstract
Flow structure of premixed propane-air swirling jet flames at various combustion regimes was studied experimentally by stereo PIV, CH chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in the stabilisation of the premixed lifted flame. For the studied swirl rates (S∈= 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S∈= 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4. This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive the transition from the quasi-tubular to the lifted flame regime.
| Original language | English |
|---|---|
| Pages (from-to) | 569-595 |
| Number of pages | 27 |
| Journal | Flow, Turbulence and Combustion |
| Volume | 87 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jan 2011 |
| Externally published | Yes |
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Keywords
- Large-scale vortices
- PIV
- Premixed turbulent flame
- Swirling flow
- Vortex breakdown
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
Cite this
Flow structure of swirling turbulent propane flames. / Alekseenko, Sergey V.; Dulin, Vladimir M.; Kozorezov, Yuriy S.; Markovich, Dmitriy M.; Shtork, Sergey I.; Tokarev, Mikhail P.
In: Flow, Turbulence and Combustion, Vol. 87, No. 4, 01.01.2011, p. 569-595.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Flow structure of swirling turbulent propane flames
AU - Alekseenko, Sergey V.
AU - Dulin, Vladimir M.
AU - Kozorezov, Yuriy S.
AU - Markovich, Dmitriy M.
AU - Shtork, Sergey I.
AU - Tokarev, Mikhail P.
PY - 2011/1/1
Y1 - 2011/1/1
N2 - Flow structure of premixed propane-air swirling jet flames at various combustion regimes was studied experimentally by stereo PIV, CH chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in the stabilisation of the premixed lifted flame. For the studied swirl rates (S∈= 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S∈= 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4. This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive the transition from the quasi-tubular to the lifted flame regime.
AB - Flow structure of premixed propane-air swirling jet flames at various combustion regimes was studied experimentally by stereo PIV, CH chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in the stabilisation of the premixed lifted flame. For the studied swirl rates (S∈= 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S∈= 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4. This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive the transition from the quasi-tubular to the lifted flame regime.
KW - Large-scale vortices
KW - PIV
KW - Premixed turbulent flame
KW - Swirling flow
KW - Vortex breakdown
UR - http://www.scopus.com/inward/record.url?scp=81855225828&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=81855225828&partnerID=8YFLogxK
U2 - 10.1007/s10494-011-9340-5
DO - 10.1007/s10494-011-9340-5
M3 - Article
VL - 87
SP - 569
EP - 595
JO - Flow, Turbulence and Combustion
JF - Flow, Turbulence and Combustion
SN - 1386-6184
IS - 4
ER -