Modeling of Combustion and Non-Equilibrium Ionization in Spark Ignition Engines

The combustion of hydrocarbon fuels in cylinders of Spark Ignition (SI) engine is accompanied with various non-equilibrium chemical transformations, which are responsible for the operational and ecological parameters of the engine.

Chemical non-equilibrium model and computer code of the combustion in a cylinder of SI engine was developed. It is based on the chemical kinetic model of combustion and interaction of combustion products. The model of the ionization current in a cylinder of SI engine was developed and added.

The created model provides the important understanding of such sophisticated processes as combustion products behavior, chemical and thermal ionization, production of pollutants etc. The model predicts two peaks in the ionization current with good amplitude and phasing performance. It illuminates physical processes including chemical and thermal ionization. The model predicts two major peaks in the ionization current with sufficient amplitude and phasing performance for a given class of engines.