2024-03-28T13:12:00Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00028176
2022-04-27T08:56:14Z
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Numerical study on ultra-lean rotating counterflow twin premixed flame of hydrogen–air
上道, 茜
西岡, 牧人
Uemichi, Akane
Nishioka, Makihito
Rotating counterflow twin premixed flame (RCTF) of hydrogen air was numerically simulated with detailed chemistry to explore the possibility of ultra-lean combustion. As a result, it was found that ultra-lean RCTF of equivalence ratio Φ = 0.052, which is far leaner than the generally-recognized flammability limit Φ = 0.10, is realized. It was also found that under ultra-lean conditions the flame temperature of RCTF largely exceeds the adiabatic flame temperature; e.g., at Φ = 0.06 the former is 1171 K, while the latter is 503 K. This increase of burned gas temperature is attributed to the so-called low Lewis number effect within the flammability limit, but under an ultra-lean condition some other mechanism to increase temperature is dominant. The “pseudo local equivalence ratio” of burned gas of RCTF differs largely from that of the unburned gas due to the extraordinarily high concentration of H2O. This suggests the possibility that the local condition at the reaction zone is much richer than the unburned gas, which brings about the large temperature increase.
journal article
Elsevier Inc.
2013
application/pdf
Proceedings of the Combustion Institute
1
34
1135
1142
http://hdl.handle.net/2241/118293
1540-7489
AA11552208
https://tsukuba.repo.nii.ac.jp/record/28176/files/PRC-CI_34-1.pdf
eng
10.1016/j.proci.2012.07.036
© 2012 Published by Elsevier Inc. on behalf of The Combustion Institute.
NOTICE: this is the author’s version of a work that was accepted for publication in Proceedings of the Combustion Institute. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in PUBLICATION, 34, 1, 2013, DOI:10.1016/j.proci.2012.07.036