Journal
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
Volume 22, Issue 5, Pages 1702-1713Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1468087420914714
Keywords
Ducted fuel injection; inner diameter; standoff distance; spray characteristics
Funding
- Beijing Natural Science Foundation [3192032]
- National Natural Science Foundation of China [51806012]
- State Key Laboratory of Engines [K2019-01]
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The study found that ducted fuel injection spray with smaller ducts has better spray diffusion and velocity, forming a mushroom-shaped head and large-scale vortex flow, which help improve fuel-gas mixing quality.
Ducted fuel injection spray is a new technology for reducing soot formation in heavy-duty diesel engines. In this work, the ducted fuel injection spray characteristics with different duct inner diameters and different standoff distances were investigated and compared with free spray. Duct inner diameter ranged from 1.5 to 4 mm, and standoff distance varied between 0.9 and 4.9 mm. Mie-scattering optical technique was used to characterize spray characteristics under various injection pressures in a constant-volume spray chamber. Ambient gas pressure of up to 6 MPa when spraying. The results showed that ducted fuel injection spray with smaller duct has better spray diffusion compared to those of ducted fuel injection sprays with larger ducts and free spray from the perspectives of spray tip penetration, spray cone angle and spray area. Increasing standoff distance could increase spray velocity. Ducted fuel injection spray with smaller duct formed a mushroom-shaped head and large-scale vortex flow close to the duct outlet. All the advantages of ducted fuel injection spray with smaller duct are interpreted as evidence of improving fuel-gas mixing quality significantly.
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