Abstract
If the flame temperature and the reaction speed can be controlled arbitrarily, it is of great help for energy saving through effective utilization of heat generated by combustion. In order to examine the possibility of such mild or moderate combustion, we tried to identify possible weakest flames experimentally with heated meso-scale channel, that is, combustion with controlled heat balance. Results show that the lowest flame speed may exist even though heat loss is compensated by the external heating. For the case of low flow velocity condition, the temperature difference between heated channel wall surface and flame measured by using thermocouple became smaller and smaller with decreasing flow velocity. It implies that there is the lowest flame temperature which corresponds to ignition temperature. To further examine existence and its mechanism of the lowest flame speed, 1-D computations with detailed chemistry were conducted. Computational results show a limit of stable solution in the low velocity region as well as experimental results. Furthermore, diffusive mass transfer was dominant compared to convective mass transfer in the low velocity region. It is probably related to the existence of the lowest flame speed, since the radical species, which is vital for chain reaction, diffuse out from reaction zone.
| Original language | English |
|---|---|
| Title of host publication | ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) |
| Publisher | American Society of Mechanical Engineers (ASME) |
| Pages | 155-158 |
| Number of pages | 4 |
| Volume | 6 |
| ISBN (Print) | 0791843009 |
| DOIs | |
| Publication status | Published - 2007 |
| Externally published | Yes |
| Event | ASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, United States Duration: 2007 Nov 11 → 2007 Nov 15 |
Other
| Other | ASME 2007 International Mechanical Engineering Congress and Exposition, IMECE 2007 |
|---|---|
| Country | United States |
| City | Seattle |
| Period | 07/11/11 → 07/11/15 |
Fingerprint
Keywords
- Extinction limit
- Ignition
- Lowest flame temperature
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
Study on ignition and weak flame in heated meso-scale channel. / Tsuboi, Yosuke; Yokomori, Takeshi; Maruta, Kaoru.
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE). Vol. 6 American Society of Mechanical Engineers (ASME), 2007. p. 155-158.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Study on ignition and weak flame in heated meso-scale channel
AU - Tsuboi, Yosuke
AU - Yokomori, Takeshi
AU - Maruta, Kaoru
PY - 2007
Y1 - 2007
N2 - If the flame temperature and the reaction speed can be controlled arbitrarily, it is of great help for energy saving through effective utilization of heat generated by combustion. In order to examine the possibility of such mild or moderate combustion, we tried to identify possible weakest flames experimentally with heated meso-scale channel, that is, combustion with controlled heat balance. Results show that the lowest flame speed may exist even though heat loss is compensated by the external heating. For the case of low flow velocity condition, the temperature difference between heated channel wall surface and flame measured by using thermocouple became smaller and smaller with decreasing flow velocity. It implies that there is the lowest flame temperature which corresponds to ignition temperature. To further examine existence and its mechanism of the lowest flame speed, 1-D computations with detailed chemistry were conducted. Computational results show a limit of stable solution in the low velocity region as well as experimental results. Furthermore, diffusive mass transfer was dominant compared to convective mass transfer in the low velocity region. It is probably related to the existence of the lowest flame speed, since the radical species, which is vital for chain reaction, diffuse out from reaction zone.
AB - If the flame temperature and the reaction speed can be controlled arbitrarily, it is of great help for energy saving through effective utilization of heat generated by combustion. In order to examine the possibility of such mild or moderate combustion, we tried to identify possible weakest flames experimentally with heated meso-scale channel, that is, combustion with controlled heat balance. Results show that the lowest flame speed may exist even though heat loss is compensated by the external heating. For the case of low flow velocity condition, the temperature difference between heated channel wall surface and flame measured by using thermocouple became smaller and smaller with decreasing flow velocity. It implies that there is the lowest flame temperature which corresponds to ignition temperature. To further examine existence and its mechanism of the lowest flame speed, 1-D computations with detailed chemistry were conducted. Computational results show a limit of stable solution in the low velocity region as well as experimental results. Furthermore, diffusive mass transfer was dominant compared to convective mass transfer in the low velocity region. It is probably related to the existence of the lowest flame speed, since the radical species, which is vital for chain reaction, diffuse out from reaction zone.
KW - Extinction limit
KW - Ignition
KW - Lowest flame temperature
UR - http://www.scopus.com/inward/record.url?scp=84928616903&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84928616903&partnerID=8YFLogxK
U2 - 10.1115/IMECE200743339
DO - 10.1115/IMECE200743339
M3 - Conference contribution
SN - 0791843009
VL - 6
SP - 155
EP - 158
BT - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
PB - American Society of Mechanical Engineers (ASME)
ER -