In the direct injection spark ignition gasoline engine (D-4), thin fan-shaped high-dispersion, high-penetration and high-atomization spray formed by the slit nozzle generates a stratified mixture cloud without depending on a strong intake air motion, subsequently realizing stable stratified charge combustion. To improve fuel economy further in actual traffic, the region of stratified charge combustion in torque-engine speed map must be expanded by improving spray characteristics. Since the fuel flow inside the nozzle has a large effect on the spray characteristics, it was clarified this effect by visual analysis of the fuel flow inside the nozzle using an enlarged acrylic slit nozzle of 10 magnifications. Consequently, it was found that vortices are generated frequently within a sac even in the case of steady state conditions. The effect on the spray characteristics is corresponding to the vortex scale. Stratified charge combustion was improved by reducing the vortex scale, subsequently improving the spray characteristics.
Analysis of Visualized Fuel Flow inside the Slit Nozzle of Direct Injection SI Gasoline Engine
Sae Technical Papers
SAE 2003 World Congress & Exhibition ; 2003
2003-03-03
Aufsatz (Konferenz)
Englisch
Visualization analysis of fuel flow inside slit nozzle for direct injection SI gasoline engine.
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