Study on ignition and weak flame in heated meso-scale channel

Yosuke Tsuboi, Takeshi Yokomori, Kaoru Maruta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

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 languageEnglish
Title of host publicationProceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE 2007
Pages155-158
Number of pages4
DOIs
Publication statusPublished - 2008 May 29
EventASME International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, WA, United States
Duration: 2007 Nov 112007 Nov 15

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
Volume6

Other

OtherASME International Mechanical Engineering Congress and Exposition, IMECE 2007
CountryUnited States
CitySeattle, WA
Period07/11/1107/11/15

Keywords

  • Extinction limit
  • Ignition
  • Lowest flame temperature

ASJC Scopus subject areas

  • Engineering(all)

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