Simplified and Detailed Chemistry Modeling of Constant-Volume Diesel Combustion Experiments

The high complexity of the interplaying physical and chemical phenomena occurring in Diesel combustion has brought an increasing interest versus experimental and computational fundamental studies. A relevant contribution to the availability of suitable and accessible experimental data is represented by the Engine Combustion Network database, which are of great interest for model development and validation because of the well-defined boundary conditions and the wide range of conditions employed [1].

In this paper the authors implemented into a unique open-source CFD code two different combustion models of different complexity and applied them to simulate a selection of significant test cases from this database. The first one is an extension of the Eddy Dissipation Model and it can be used as a development tool because of its limited computational demand. The second one is the Perfectly Stirred Reactor model and directly employs detailed chemical kinetics in each computational cell, making use of the ISAT tabulation to reduce the computational time. Global heat release rate, flame lift-off lengths and flame structure (HCHO, PAH and soot distributions) are compared with the available experimental data.