Effects of Fuel Temperature and Ambient Pressure on a GDI Swirled Injector Spray 2000-01-1901
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.
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. Download Citation
Author(s):
L. Araneo, A. Coghe, G. Brunello, R. Dondé
Affiliated:
Politecnico di Milano, CNR-TeMPE
Pages: 13
Event:
CEC/SAE Spring Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Gasoline Direct Injection Engines-SP-1547
Related Topics:
Nozzles
Pressure
Imaging and visualization
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