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Effects of Fuel Temperature and Ambient Pressure on a GDI Swirled Injector Spray
Technical Paper
2000-01-1901
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of fuel temperature on both the geometry and the droplet size and velocity of a GDI swirled injector spray were investigated by means of visualizations and PDA measurements. Isooctane was used as model fuel and was injected in a quiescent bomb at injection pressure of 7 MPa. Bomb pressure ranged from 40 kPa to 800 kPa with injector nozzle temperature ranging from 293 K to 393 K. A drastic change in spray geometry was observed when conditions above the vaporization curve were reached. The temperature increase has two macroscopic effects on the spray geometry: at the nozzle exit the liquid flash boiling strongly enlarges the spray angle, at a certain distance from the nozzle the air entrainment collapses the spray. Raising the fuel temperature up to flash boiling conditions causes a significant decrease of the average droplet size.
Authors
Citation
Araneo, L., Coghe, A., Brunello, G., and Dondé, R., "Effects of Fuel Temperature and Ambient Pressure on a GDI Swirled Injector Spray," SAE Technical Paper 2000-01-1901, 2000, https://doi.org/10.4271/2000-01-1901.Also In
References
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