Further refinement and validation of a turbulent flame propagation model for spark-ignition engines
✍ Scribed by Rodney J. Tabaczynski; Frederick H. Trinker; Ben A.S. Shannon
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 931 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
A turbulent flame propagation model that is dependent on the structure of the turbulent flow field is formulated and applied to combustion in a spark-ignition engine. The turbulence structure is modeled after the work of Tennekes and assumes that the flow is composed of vortex tubes the diameter of the Kolmogorov scale and the spacing of the Taylor mircoscale. Combustion is assumed instantaneous over the Kolmogorov scale and the burned gases in the vortex tubes are assumed to propagate at a rate equal to U' + S L. Combustion is assumed to proceed in a laminar fashion across the microscale. In applying the model to a spark-ignition engine, we conserve the turbulent kinetic energy and angular momentum in the unburned gases. Validation of the model is presented in the form of mass fraction burned versus crank angle curves. Comparisons of predicted versus experimental data show good agreement for variations in equivalence ratio, dilution, speed, load, and spark advance.