Characteristics of gas-dissolved diesel fuel spray - (Spray characteristics and simulating flash polling process)

A new injection system using mixed fuel dissolved with liquefied CO2 is pro posed in this paper. Liquefied CO2 is mixed with n-Tridecane under pressure in order to promote spray atomization and evaporation due to the effect of the flash boiling phenomenon during fuel injection, and to control the com bustion process due to the effect of the internal exhaust gas recirculation (EGR) effect of CO2 gas. Therefore, a simultaneous reduction of soot and N Ox is achieved effectively using this injection system. In this study, the characteristics of diesel fuel spray dissolved with liquefied CO2 are inves tigated quantitatively by several optical measurements. The spray character istics are revealed by analyzing the chemical thermodynamics. As a result, it is determined that atomization of this fuel is promoted by flash boiling much more than in n-Tridecane, which is normal reference fuel, and the spr ay structure is considerably different from that of the normal fuel. Moreov er, the numerical analysis of atomization and vaporization processes are ca rried out, based on the flash boiling spray model.