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ID 31644
file
title alternative
Flame Speeds in Vortex Rings of Methane/Air and Propane/Air Mixtures
creator
Hamasaki, Takashi
Hasegawa, Ryo
Koumura, Kiminori
Taki, Shiro
subject
Flames
Flame Speed
Flame Propagation
Vortex Ring
Methane
Propane
NDC
Technology. Engineering
abstract
The flame speed in vortex rings of methane/air and propane/air mixtures has been measured bya high speed video camera and the maximum tangential velocity in the vortex ring has been estimated from the hot-wire measurements on the cold-air vortex rings. Results show that in accordance with the back-pressure drive flame propagation mechanism the flame speeds increase almost linearly with the maximum tangential velocity and their slopes are around unity for all the lean, stoichiometric and rich mixtures investigated. However, it is found that the flame speed is lowered down when the flame diameter becomes small, and the flame can never propagate in lean mixtures if the flame diameter becomes less than the order of the laminar flame thickness. Also, it is found that in the near rich-limit methane/air mixture the flame speed becomes almost constant independently of the maximum tangential velocity. It would appear that the flame should propagate in the mixing zone with the ambient air.
journal title
日本機械学會論文集. B編
volume
Volume 65
issue
Issue 636
start page
2881
end page
2887
date of issued
1999-08-25
publisher
一般社団法人日本機械学会
issn
0387-5016
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
社団法人日本機械学会
本文データは学協会の許諾に基づきCiNiiから複製したものである
relation is version of URL
http://ci.nii.ac.jp/naid/110002395577
department
Graduate School of Engineering