Direct injection gasoline-engines have both better engine power and fuel efficiency than port injection gasoline-engines. However, direct injection gasoline-engines also emit more particulate matter (PM) than port injection gasoline-engines do. To decrease PM, fuel injectors with short spray-penetration are required. More effective fuel injectors can be preliminarily designed by numerically simulating fuel spray. We previously developed a fuel-spray simulation. Both the fuel flow within the flow paths of an injector and the liquid column at the injector outlet were simulated by using a grid method. The liquid-column breakup was simulated by using a particle method. The motion of droplets within the air/fuel mixture (secondary-drop-breakup) region was calculated by using a discrete droplet model (DDM). In this study, we applied our fuel-spray simulation to sprays for the direct injection gasoline-engines. Simulated spray penetrations agreed relatively well with measured spray penetrations. Velocity distributions at the outlet of three kinds of nozzles were plotted by using a histogram, and the relationship between the velocity distributions and spray penetrations was studied. We found that shrinking the high-speed region and making the velocity-distribution uniform were required for short spray penetration.
- Internal Combustion Engine Division
Short Spray-Penetration for Direct Injection Gasoline-Engines With Numerical Simulation
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Ishii, E, Abe, M, Ehara, H, & Ishikawa, T. "Short Spray-Penetration for Direct Injection Gasoline-Engines With Numerical Simulation." Proceedings of the ASME 2013 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Fuels; Numerical Simulation; Engine Design, Lubrication, and Applications. Dearborn, Michigan, USA. October 13–16, 2013. V002T06A002. ASME. https://doi.org/10.1115/ICEF2013-19026
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