REVISING “OLD” GOOD MODELS: DETAILED CHEMISTRY SPRAY COMBUSTION MODELING BASED ON EDDY DISSIPATION CONCEPT

Till recently, the application of the detailed combustion chemistry approach as a predictive tool for engine modeling has been a sort of a “taboo” motivated by different reasons, but mainly, by an exaggerated rigor to the chemistry/turbulence interaction modeling. The situation has drastically changed only recently, when STAR-CD and Reaction Design declared in Deur et al. (2001) the aim to combine three-dimensional flow solver with detailed chemistry analysis based on the Chemkin and Surface Chemkin packages. Relying on their future developments, we present here the methodology termed the “generalized partially stirred reactor”, PaSR, model incorporated into the KIVA code. The basic novelty of the methodology is the coupling of the semi-analytical PaSR model with the effective numerics based on a sparse matrix technique to treat detailed oxidation kinetics of hydrocarbon fuels assuming that chemical processes proceed in two successive steps: the reaction act follows after the micro mixing resolved on a sub grid scale. In a completed form, the model represents detailed chemistry extension of the classic EDC- turbulent combustion model This extension is a subject of the special analysis below.

The model application is illustrated by results of three dimensional numerical simulation of spray combustion and emission formation in the Volvo DC12C DI Diesel engine.