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International Journal of Automotive Technology > Volume 3(1); 2002 > Article
International Journal of Automotive Technology 2002;3(1): 17-25.
MIXING CONDITIONS WITH SPRAY-JET INTERACTION FOR EFFECTIVE SOOT REDUCTION IN DIESEL COMBUSTION
Takemi Chikahisa, Yukio Hishinuma, Hirohisa Ushida
Hokkaido University
ABSTRACT
The authors have reported significant reduction in particulate emissions of diesel engines by generating strong turbulence during the combustion process. This study aims to identify optimum conditions of turbulent mixing for effective soot reduction during combustion. The experiments were conducted with a constant volume combustion vessel equipped with a jet-generating cell, in which a small amount of fuel is injected during the combusion of the main spary. The jet of burned gas from the cell impings the main flame, causing changes in the mixing of fuel and air. Observation was made for a variety combinations of distances between spray nozzle and jet orifice at different directions of impingement. It is shown that compared with the case without jet flame soot decrease when the jet impings. When the jet is very close to the flame, it penetrates the soot cloud and causes little mixing. There were no apparent differences in the combustion duration when the direction of impingement was varied, although the mechanisms of soot reduction seemed different. An analysis of local turbulent flows with PIV (Particle Image Velocimetry) showed the relationship between the scale of the turbulence and the size of the soot cloud.
Key Words: Soot, Particular, Spray, Combustion, Turbulence, Mixing, Jet impingement
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