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Analysis of Visualized Fuel Flow inside the Slit Nozzle of Direct Injection SI Gasoline Engine
Technical Paper
2003-01-0060
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
Citation
Matsumura, E., Tomita, T., Takeda, K., Furuno, S. et al., "Analysis of Visualized Fuel Flow inside the Slit Nozzle of Direct Injection SI Gasoline Engine," SAE Technical Paper 2003-01-0060, 2003, https://doi.org/10.4271/2003-01-0060.Also In
References
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- Kanda M. et.al “Aplication of a New Combustion Concept to Direct Injection SI Gasoline Engine” SAE Paper 2000-01-0531
- Schmidt D.P. et.al “Cavitation In Two-Dimensional Asymmetric Nozzles” SAE Paper 1999-01-0518
- Soteriou C. et.al “Further Studies of Cavitation and Atomization in Diesel Injection” SAE Paper 1999-01-1486
- soteriou C. et.al “Direct Injection Diesel Sprays and the Effect of Cavitation and Hydraulic Flip on Atomization” SAE Paper 950080
- Arcoumanis C. et.al “Analysis of the Flow in the Nozzle for a Vertical Multi Hole Diesel Engine Injector” SAE Paper 980811