Fuel Design Concept for Low Emission in Engine Systems 2nd report: Analysis of combustion characteristics for the mixed fuels 2001-01-0202

In the present study, we have proposed a novel fuel design concept in order to achieve low emissions and combustion control in engine systems. The fuel design concept is based on the combustion control that could be realized by using a mixed fuel with a lower boiling point fuel, such as gasoline or gaseous fuel components and a higher boiling point fuel, such as gas oil or fuel oil components. According to the fuel design concept proposed in this work, the characteristics of vaporization during mixture formation process as well as of combustion can be reasonably improved due to the formation of two-phase region. The heat release analysis was conducted to compare the temporal history of heat release for both a mixed fuel and a single component fuel that has the same transport properties of mixed fuels. In addition, the two-color method, which simultaneously allows the measurements of temperature distribution and soot concentration, is applied to the combustion field for mixed fuels. The several experiments were conducted in Rapid Compression & Expansion Machine (RCEM). The experimental results related to fuel distribution and combustion process shows that the fuel design concept proposed in the present study can be applied to the combustion system for low emission and combustion control.