Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 32, Issue -, Pages 1763-1770Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.05.085
Keywords
Stratified flames; Premixed flames; Turbulent combustion; Flame surface density; Flame curvature
Funding
- Brazilian Council for Scientific and Technological Development (CNPq), Rolls-Royce
- Royal Society
- Royal Academy of Engineering
Ask authors/readers for more resources
Combustion under stratified conditions is common in many systems. However, relatively little is known about the structure and dynamics of turbulent stratified flames. Two-dimensional imaging diagnostics are applied to premixed and stratified V-flames at a mean equivalence ratio of 0.77, and low turbulent intensity, within the corrugated flame range. The present results show that stratification affects the mean turbulent flame speed, structure and geometric properties. Stratification increases the flame Surface density above the premixed flame levels in all cases, with a maximum reached at intermediate levels of stratification. The flame surface density (FSD) of stratified flames is higher than that of premixed flames at the same mean equivalence ratio. Under the present conditions, the FSD peaks at a stratification ratio around 3.0. The FSD curves for stratified flames are further skewed towards the product side. The distribution of flame curvature in stratified flames is broader and more symmetric relative to premixed flames, indicating an additional mechanism of curvature generation. which is not necessarily due to cusping. These experiments indicate that flame stratification affects the intrinsic behaviour of turbulent flames and suggest that models may need to be revised in the light of the current evidence. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available