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ID 31647
file
title alternative
Pressure Change and Flame Characteristics in a Stretched, Rotating Flow
creator
Yamamoto, Kazuhiro
subject
Premixed Combustion
Swirling Flow
Pressure Distribution
Diffusion
Mass Transfer
Tubular Flame
Flame Stretch
NDC
Technology. Engineering
abstract
To investigate the pressure change and flame characteristics in a stretched, rotating flow, tubular flames of a lean hydrogen, methane, or propane-air mixture have been numerically simulated. Results show that, with rotation, the flame temperature of hydrogen and methane mixtures increases monotonically, while, that of a propane mixture decreases. With an increase of the fuel concentration, the position at which the reaction rate is maximum increases, and the temperature change becomes small. As seen in the pressure distribution, the pressure decreases around the center, and a pressure gradient is formed. This pressure gradient is steep near the center, but decreases as the radial distance is increased. The fuel flux decreases with the increase of circumferential velocities because of the decrease in the pressure gradient. For these reasons, this temperature change could be explained in terms of the pressure diffusion which results in mass transport due to the pressure gradient. However, it is also found that, with rotation, the pressure decreases and the density changes. The velocities increase due to flow expansion, resulting in an increase of flame stretch. Thus, the flame characteristic change with rotation is explained with the coupling of pressure diffusion and stretch effects.
journal title
日本機械学會論文集. B編
volume
Volume 63
issue
Issue 615
start page
3751
end page
3757
date of issued
1997-11-25
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/110002396701
department
Graduate School of Engineering