ID 432

Fuel Design Approach for Spray Combustion Control Related to Flash Boiling Spray

 

Abstract:

I have proposed a novel approach regarding fuel design methodology targeting both Diesel and Gasoline engines and demonstrated that the fuels designed based on this approach were effective to achieve high thermal efficiency and low pollutants emissions. Flash boiling spray is applied to improve the spray atomization and evaporation processes by using several kinds of mixed fuels with relatively low injection pressure. This keynote speech is a review concerning my previous researches, focusing on spray dynamics. In the mixed fuels, additives or lower boiling point fuels such as CO2, gas fuel and Gasoline component, are mixed into a higher boiling point fuel such as Diesel Gas oil, through vapor-liquid equilibrium with a formation of two-phase region in pressure-temperature diagram, where liquid and vapor phases of both components are mixed in. In this scheme, I intend to control both the physical process, that is the fuel vapor formation rate or spatial vapor distribution, and chemical processes, which are the mixture ignition, emission reduction of NOx and PM, and HC burnout. Then it is easy for mixed fuel to ready undergo flash boiling spray due to the formation of two-phase region on P-T diagram, providing as well as a relatively lean and homogeneous vapor mixture. In the experiments, I conducted mixed fuel application studies for actual diesel combustion field by use of mixed fuel consisting of liquefied CO2 as an additive with n-Tridecane as a typical component of diesel gas oil, and mixed fuel of Gas or Gasoline component with Diesel Gas oil component to control evaporation process.