MODELING OF IGNITION PROCESS FOR PREMIXED COMBUSTION IN A CONSTANT VOLUME BOMB

ARANCIAGA JOAQUIM; LOPEZ EZEQUIEL; NIGRO NORBERTO

Santa Fe

Congreso; ENIEF 2019; 2019

AMCA - CIMEC

Computational Fluid Dynamics is a widespread tool employed in the design of Internal Com-bustion Engines (ICE), mainly focused to improve efficiency and reduce pollutant emissions. Given thecomplexity associated with solving turbulent, multiphase, chemically reacting flows, many models havebeen proposed to represent as accurate as possible phenomena taking place inside ICE, keeping compu-tational costs below reasonable levels. Specifically, mixture ignition and initial flame kernel developmentare decisive factors affecting the whole combustion process in spark-ignition engines, and current igni-tion models are not able to correctly predict the flame behavior when ICE operative conditions are varied,making it a subject that has drawn attention over the last years. In the present work, an ignition modeltaken from the literature named ISSIM (Imposed Stretch Spark Ignition Model), originally developedfor LES (Large Eddy Simulation) is implemented in OpenFOAM R and adapted here to work with eddyviscosity models using RANS (Reynolds-Average Navier-Stokes) equations. Ignitions of air-propanemixtures in a constant volume bomb are simulated for different equivalence ratios and turbulent intensitylevels, analyzing the dependence of the solution on the electrical parameters of the spark-ignition system.Results are contrasted with experimental data selected from the literature, and furthermore, advantagesand drawbacks are discussed compared to other ignition models used in common practice.