Improvement of Thermal Efficiency and Exhaust Emission in Diesel Engine by Applying Spray Internal EGR

-The Atomization Characteristics of Diesel Spray Using CO₂ Gas Dissolved Fuel-

Abstract

Low emission and high efficiency is required of diesel engine. As a method of improvement of the combustion, high pressure injection is carried out. However, efficiency of atomization is very low in this method. Therefore, it is necessary to develop a technique to atomize and distribute spray under low injection pressure. Our study suggests EGR gas dissolved fuel. EGR gas dissolved fuel improves spray atomization by effervescent atomization. Furthermore, NOx emissions are reduced by internal-EGR gas. As basic research, the purpose of this paper is to evaluate the influence of the atomization characteristics of the CO2 dissolved fuel spray.