Droplet Behaviors of DI Gasoline Wall Impinging Spray by Spray Slicer

2020-01-1152

04/14/2020

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Event
WCX SAE World Congress Experience
Authors Abstract
Content
Owing to the small size of engines and high injection pressures, it is difficult to avoid the fuel spray impingement on the combustion cylinder wall and piston head in Direct Injection Spark Ignition (DISI) engine, which is a possible source of hydrocarbons and soot emission. As a result, the droplets size and distribution are significantly important to evaluate the atomization and predict the impingement behaviors, such as stick, spread or splash. However, the microscopic behaviors of droplets are seldom reported due to the high density of small droplets, especially under high pressure conditions. In order to solve this problem, a “spray slicer” was designed to cut the spray before impingement as a sheet one to observe the droplets clearly. The experiment was performed in a constant volume chamber under non-evaporation condition, and a mini-sac injector with single hole was used. The filtering device should be as less intrusive as possible, so to detect a momentum flux distribution corresponding to the un-disturbed free spray. To fulfill this basic requirement, different slicer thickness (Tslicer) were tested by comparing the droplets behaviors through Particle Image Analysis (PIA) method. The droplet size and velocity distributions were presented and discussed. Results show that the “spray slicer” works better to cut the spray with smaller Tslicer. However, the velocity of the droplet at the tip of the spray decreases sharply with a decrease in Tslicer. When Tslicer = 0.4 mm, the dense region of the spray tip shows clear structure with less overlap droplets and the velocity is almost the same as that of Tslicer = 0.8 mm. Furthermore, the droplets diameter-velocity, velocity and diameter-minimum distance distributions at different locations were analyzed.
Meta TagsDetails
DOI
https://doi.org/10.4271/2020-01-1152
Pages
10
Citation
Wang, C., Long, W., Luo, H., Nishida, K. et al., "Droplet Behaviors of DI Gasoline Wall Impinging Spray by Spray Slicer," SAE Technical Paper 2020-01-1152, 2020, https://doi.org/10.4271/2020-01-1152.
Additional Details
Publisher
Published
Apr 14, 2020
Product Code
2020-01-1152
Content Type
Technical Paper
Language
English