Browse Publications Technical Papers 2005-24-057
2005-09-11

3D Simulations by a Detailed Chemistry Combustion Model and Comparison With Experiments of a Light-Duty, Common-Rail D.I. Diesel Engine 2005-24-057

The present paper reports the results of the numerical simulations carried out by means of a modified version of the KIVA-3V code and of the comparison with experimental results obtained by using different optical techniques in a single-cylinder optically accessible diesel engine. The engine is equipped with a commercial four valves cylinder head and a second-generation, Common-Rail injection system.
A detailed kinetic model consisting of 283 reactions involving 69 species is applied to simulate the combustion process and the soot and NOx formation. The fuel surrogate model consisting of two constituent components, n-heptane and toluene, approximating the physical and ignition properties of the diesel oil, is considered. The Partially Stirred Reactor (PaSR) assumption is adopted to maintain the computational cost within acceptable limits.
The collections of digital images of the spray evolution, the mixture formation and the combustion processes are performed by running the engine at 1000 rpm. The spatial distribution of OH radicals and soot is also estimated by spectral flame emissions analysis. Commercial diesel fuel is injected by using three different strategies, made of one to three consecutive injections.

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