SAE International, 2004. — 05P-260 — 15 p.Abstract
A validation of a fractal combustion model included within a whole-engine one-dimensional model (1Dime code) was made by a comparison between numerical and experimental data. Theoretical and experimental analyses allowed to characterize flame structure and propagation speed in the combustion chamber.
Experimental data consisted of in-cylinder pressure measurements and optical measurements based on 2D digital imaging and UV chemiluminescence of radical species. The rate of chemical energy release and related parameters were evaluated from the cylinder pressure data using interpretation models for heat release analysis. Moreover a post-processing of the optical measurements allowed to define the mean flame radius, and propagation speeds as well, as a function of the crank angle.
The experimental activity was carried out in the combustion chamber of an optically accessible one-cylinder engine, equipped with a commercial head. In order to estimate prediction levels and limitations in the tested operating range, different engine speeds and spark timings were tested.
