Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine

2004-01-0542

03/08/2004

Event
SAE 2004 World Congress & Exhibition
Authors Abstract
Content
Experimental investigations of fuel breakup very close to nozzle of practical high-pressure swirl injector, which is used in gasoline direct injection (GDI) engine, were carried out. In GDI engines, fuel is directly injected into cylinder therefore the spray characteristics and mixture formation are of primary importance. In this research, visualizations of primary spray formation process were demonstrated using a high-speed video camera (maximum speed: 1Mfps) with a long-distance microscope. Initial state and development of the spray were discussed under the different injection pressure condition. During the injection period, the length and thickness of the liquid sheet, which is produced from the nozzle exit, were measured using Ar-ion laser sheet and high-speed camera. Primary spray structure and behavior of liquid sheet, especially surface wave of liquid sheet, at nozzle exit were discussed using obtained images. Three main conclusions were drawn from this study. (1) It has been shown that the liquid fuel column without swirl motion was injected as a compact jet at the beginning of the injection. During the injection period, the spray indicates the quasi-steady state mode. (2) Liquid film sheet has a ligament structure. Using Ar-ion laser sheet and high-speed camera, length and thickness of the liquid sheet can be measured. Higher injection pressure causes thinner thickness and shorter length of liquid sheet. (3) Surface waves of liquid sheet can be recognized. Higher injection pressure makes larger wavelength of surface waves of liquid sheet of swirl injector.
Meta TagsDetails
DOI
https://doi.org/10.4271/2004-01-0542
Pages
11
Citation
Kawahara, N., Tomita, E., Kasahara, D., Nakayama, T. et al., "Fuel Breakup Near Nozzle Exit of High-Pressure Swirl Injector for Gasoline Direct Injection Engine," SAE Technical Paper 2004-01-0542, 2004, https://doi.org/10.4271/2004-01-0542.
Additional Details
Publisher
Published
Mar 8, 2004
Product Code
2004-01-0542
Content Type
Technical Paper
Language
English