Reduction of Unburnt Gaseous Fuel Emission in a Diesel Engine Dual-Fueled with Gaseous Fuel by Optimization of Combustion Chamber Design

Abstract

In dual fuel compression ignition engines fueled with diesel and gaseous fuel, an increase in unburnt gaseous fuel emission and thermal efficiency deterioration caused by high unburnt emission under low load are main drawbacks. In this study, combustion chamber design is optimized to reduce the unburnt gaseous fuel emission by using a genetic algorithm in conjunction with the KIVA-4 computational fluid dynamics combustion simulation code. The simulation results show that the optimized chamber design improves the unburnt gaseous fuel emission and thermal efficiency.