Improvement of Thermal Efficiency and Exhaust Emission in Diesel Engine by Applying Spray Internal EGR (Fourth Report)

―Combustion Characteristics of CO₂ Gas Dissolved Fuel in Diesel Engine―

Abstract

We have proposed the application of EGR gas dissolved fuel which might improve spray atomization through effervescent atomization instead of high injection pressure. In this paper, the purpose is to evaluate the influence of the application of CO₂ gas dissolved fuel on the combustion characteristics and emissions inside the single cylinder direct injection diesel engine. As a result, by use of the fuel, smoke is reduced by about 50 to 70 %. The amount of NO_x is reduced at IMEP_g (Gross Indicated Mean Effective Pressure) = 0.3 MPa, but the amount of it is increased at IMEP_g = 0.9 MPa.