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Spray Structures and Vaporizing Characteristics of a GDI Fuel Spray  

Park, Dong-Seok (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Park, Gyung-Min (Department of Mechanical Engineering, Osaka University)
Kim, Duck-Jool (School of Mechanical Engineering, Pusan National University)
Publication Information
Journal of Mechanical Science and Technology / v.16, no.7, 2002 , pp. 999-1008 More about this Journal
Abstract
The spray structures and distribution characteristics of liquid and vapor phases in non-evaporating and evaporating Gasoline Direct Injection (GDI) fuel sprays were investigated using Laser Induced Exciplex Fluorescence (LIEF) technique. Dopants were 2% fluorobenzene and 9% DEMA (diethyl-methyl-amine) in 89% solution of hexane by volume. In order to study internal structure of the spray, droplet size and velocity under non-evaporating condition were measured by Phase Doppler Anemometry (PDA). Liquid and vapor phases were visualized at different moments after the start of injection. Experimental results showed that the spray could be divided into two regions by the fluorescence intensity of liquid phase: cone and mixing regions. Moreover, vortex flow of vapor phase was found in the mixing region. About 5㎛ diameter droplets were mostly distributed in the vortex flow region. Higher concentration of vapor phase due to vaporization of these droplets was distributed in this region. Particularly, higher concentration of vapor phase and lower one were balanced within the measurement area at 2ms after the start of injection.
Keywords
GDI Engine; LIEF Technique; High-Pressure Swirl Injector; Fluorescence Intensity; PDA;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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