- Author
-
Kaplan, C. R.
|
Shaddix, C. R.
|
Smyth, K. C.
- Title
- Prediction of Enhanced Soot Production Observed in Flickering Methane/Air Diffusion Flames.
- Coporate
- Naval Research Laboratory, Washington, DC
National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Combustion Institute. Symposium (International) on Combustion, 25th. Proceedings. Abstracts of Work-in-Progress Poster Session Presentations. Work-in-Poster Session 2. Paper 35. July 31-August 5, 1994,
Combustion Institute, Pittsburgh, PA,
Irvine, CA,
127 p.,
1994
- Keywords
-
combustion
|
soot
|
diffusion flames
|
methane
|
air
|
atmospheric pressure
|
flame flicker
- Abstract
- Recent quantitative experimental measurements of the local soot volume fraction have been obtained in a co-flowing, flickering CH₄/air diffusion flame burning at atmospheric pressure. Acoustic forcing of the fuel flow rate was used to phase lock the periodic flame flicker to the 10 Hz repetition rate of a pulsed laser system, permitting phase-specific measurements to be performed at a frequency close to the natural flame flicker rate. The experimental results show that for a forcing condition in which the tip of the flame is clipped, soot production is four times greater than that measured for a steady flame burning with the same mean fuel flow velocity. These results should provide demanding tests of recently formulated integrated soot models, which have been derived from experiments carried out exclusively in steady flames. In order to test how accurately such a model can predict soot production and oxidation rates in a complex combusting flowfield, time-dependent computations of sooting CH₄/air diffusion flames have been conducted for both the steady and flickering flames.