A Numerical Study on the Burning Velocity of a Spherical, Premixed Methane-Air Flame

2005-01-1124

04/11/2005

Event
SAE 2005 World Congress & Exhibition
Authors Abstract
Content
As a first step toward better understanding of the effects of flame stretch on combustion rate in SI engines, the burning velocity of a premixed, spherical, laminar methane-air flame propagating freely at standard temperature and pressure was investigated. The underlying un-stretched burning velocity was computed using CHEMKIN 3.7 with GRI mechanism, while the Lewis number and subsequently the Markstein length were deduced theoretically. The burning velocity of the freely growing flame ball was calculated from the un-stretched burning velocity with curvature and stretch effects accounted via the theoretically deduced Markstein length. For the positive Markstein length methane-air flame, flame stretching reduces the burning velocity. Therefore, the burning velocity of a spark-ignited flame starts with a value lower than, and increases asymptotically to, the underlying un-stretched burning velocity as the flame grows. The results can be useful as a first step toward a more complete fundamental understanding and/or modeling of the combustion rate in SI engines, which influences the engine performance and emissions to a great extent.
Meta TagsDetails
DOI
https://doi.org/10.4271/2005-01-1124
Pages
11
Citation
Emami, B., Liu, R., Ting, D., and Checkel, M., "A Numerical Study on the Burning Velocity of a Spherical, Premixed Methane-Air Flame," SAE Technical Paper 2005-01-1124, 2005, https://doi.org/10.4271/2005-01-1124.
Additional Details
Publisher
Published
Apr 11, 2005
Product Code
2005-01-1124
Content Type
Technical Paper
Language
English