Abstract
The main aim of the paper is a description and numerical simulation of problems connected with hydrogen combustion at ICE. Two simulation tools have been applied. The GT Power code combining classical approach to in-cylinder phenomena modeling with 1-D model of pipes has been used as the base one to model NOx emission production in dependence on engine parameters. The CFD code based on previously published Advanced Multizone Eulerian Model (AMEM) has been adapted to simulate hydrogen combustion using full reaction scheme. Reaction rates have been solved using Arrhenius law. Possibilities of treatment highly stiff source terms caused by fast kinetics are discussed. Results representing sensitivity study on influence of main engine and mixture properties on combustion and NOx formation, e.g. compression ratio, air excess, start of combustion, are presented. Approach of lean mixture in connection with retarded spark advance and rather high compression ratio used as the measure to reduce NOx emissions are discussed.