Abstract
Extinction and structure of ultra lean premixed flame formed in opposite flow has been studied experimentally. Two different concentration mixtures, extremely lean premixed gas and lean premixed gas, impinged on each other. The bulk stretch rate were varied from 80-s to 270-s, and the Lewis number (Le) were varied from 0.99 to 1.85. The local stretch rate due to flow divergence and the stagnation point were estimated by measuring the centerline velocity profile with LDV and the reaction zone was identified by OH profiles using PLIF (Planar Laser-Induced Fluorescence). The extinction behavior depends on the mixture property and the flow strain rate. For small strain rate and Le>1, the extinction limit is nearly constant regardless'of super lean premixed gas condition. On the other hand, for Le<1 and the strain rate large, ultra lean premixed gas interacts with lean premixed gas and the stable region extends to the lower fuel concentration zone.
| Original language | English |
|---|---|
| Pages (from-to) | 1108-1114 |
| Number of pages | 7 |
| Journal | Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 65 |
| Issue number | 631 |
| Publication status | Published - 1999 |
| Externally published | Yes |
Fingerprint
Keywords
- Combustion phenomena
- Extinction
- Heat loss
- Internal combustion engine
- Lewis number
- Opposite flow
- Premixed combustion
- Ultra lean combustion
ASJC Scopus subject areas
- Mechanical Engineering
- Condensed Matter Physics
Cite this
Extinction and structure of ultra lean premixed flame formed in opposite flow. / Yahagi, Yuji; Takeuchi, Masao.
In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 65, No. 631, 1999, p. 1108-1114.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Extinction and structure of ultra lean premixed flame formed in opposite flow
AU - Yahagi, Yuji
AU - Takeuchi, Masao
PY - 1999
Y1 - 1999
N2 - Extinction and structure of ultra lean premixed flame formed in opposite flow has been studied experimentally. Two different concentration mixtures, extremely lean premixed gas and lean premixed gas, impinged on each other. The bulk stretch rate were varied from 80-s to 270-s, and the Lewis number (Le) were varied from 0.99 to 1.85. The local stretch rate due to flow divergence and the stagnation point were estimated by measuring the centerline velocity profile with LDV and the reaction zone was identified by OH profiles using PLIF (Planar Laser-Induced Fluorescence). The extinction behavior depends on the mixture property and the flow strain rate. For small strain rate and Le>1, the extinction limit is nearly constant regardless'of super lean premixed gas condition. On the other hand, for Le<1 and the strain rate large, ultra lean premixed gas interacts with lean premixed gas and the stable region extends to the lower fuel concentration zone.
AB - Extinction and structure of ultra lean premixed flame formed in opposite flow has been studied experimentally. Two different concentration mixtures, extremely lean premixed gas and lean premixed gas, impinged on each other. The bulk stretch rate were varied from 80-s to 270-s, and the Lewis number (Le) were varied from 0.99 to 1.85. The local stretch rate due to flow divergence and the stagnation point were estimated by measuring the centerline velocity profile with LDV and the reaction zone was identified by OH profiles using PLIF (Planar Laser-Induced Fluorescence). The extinction behavior depends on the mixture property and the flow strain rate. For small strain rate and Le>1, the extinction limit is nearly constant regardless'of super lean premixed gas condition. On the other hand, for Le<1 and the strain rate large, ultra lean premixed gas interacts with lean premixed gas and the stable region extends to the lower fuel concentration zone.
KW - Combustion phenomena
KW - Extinction
KW - Heat loss
KW - Internal combustion engine
KW - Lewis number
KW - Opposite flow
KW - Premixed combustion
KW - Ultra lean combustion
UR - http://www.scopus.com/inward/record.url?scp=2142707643&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2142707643&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:2142707643
VL - 65
SP - 1108
EP - 1114
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 631
ER -