Abstract
The Effects of Fuel Film on Soot Formation of GDI Injector using Optical Diagnostics
Highlights
Gasoline direct injection (GDI) engines have replaced conventional port fuel injection (PFI) gasoline engines because of higher thermal efficiency
diffused back illumination extinction imaging (DBIEI) imaging was conducted during combustion process
The fuel film and soot emission characteristics were investigated at injection pressure 10 MPa, 5 ms duration at ambient pressure 3 bar
Summary
Gasoline direct injection (GDI) engines have replaced conventional port fuel injection (PFI) gasoline engines because of higher thermal efficiency. There are lack of researches of pyrolysis and soot formation from the fuel film in GDI engines, and quantitative analysis of soot formation is not conducted yet. Fuel Film and Soot Emission Characteristics Fuel film and soot emission characteristics were investigated under ambient pressure 0.3 MPa, 5 ms gasoline fuel injection with injection pressure 10 MPa. Figure 2 shows spray images using DBIEI method. Flame propagation was almost finished at 40 ms aIGN At this timing, soot formation was not observed as temperature was not high enough. The final stage showed that there is no soot formation as temperature is decreased and pyrolysis is not occurred In this stage, fuel film is still existed but do not affects soot formation
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