Comprehensive modeling of diesel engine with biogas / diesel dual fueling for optimized performance

Abstract

The present study reports the comprehensive modeling study of a 4-cylinder, 4-stroke, water cooled direct injection diesel engine. The engine is modeled for two modes of operations - one with straight diesel fueling and another in dual-fuel mode using natural gas of two compositions (70% methane + 30% C02 and 50% methane + 50% C02' by volume) with a fixed amount of pilot diesel injection for ignition purposes. Modeling is carried out for different engine speeds at different loading conditions and data obtained are analyzed to obtain various engine performance parameters. A commercial engine simulation code, 'GT- Power' is used for the modeling and simulation of the diesel engine. The results obtained from the modeling are in reasonable agreement with available experimental results. Lower cylinder gas pressure and higher bulk gas temperatures are obtained in case of fueling by natural gas. These quantities decrease with increase in the C02 content of bio gas.