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Spray atomization characteristics of a GDI injector equipped with a group-hole nozzle

Title
Spray atomization characteristics of a GDI injector equipped with a group-hole nozzle
Author
박성욱
Keywords
Group-hole nozzle; Phase Doppler particle analyzer (PDPA); Spray development behavior; Spray atomization process; Sauter mean diameter (SMD)
Issue Date
2014-08
Publisher
ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Citation
Fuel, 2014, 137, p50-59
Abstract
The main purpose of this paper is to analyze the spray characteristics of a group-hole nozzle in terms of spray behavior and atomization process in comparison to the characteristics of a single-hole nozzle as reference. Spray visualization and PDPA (phase Doppler particle analyzer) experiments were performed using a GDI adjustable injector, which can adopt a different type of nozzle at free spray conditions. By analyzing the spray development behavior and distribution of droplet velocity and diameter based on a time series, and comparing these results with that of a single-hole nozzle, the effects of the group-hole nozzle on the spray characteristics in a GDI injection were elucidated.Experimental results showed that the development processes of spray behavior from a group-hole nozzle were similar to that of the single-hole nozzle. Both the sprays had similar spray tip penetration and dispersion at the same stages of development. However, owing to the constant spray momentum from a spray interaction, the spray behavior from the group-hole nozzle seemed to be more stable than that of the single-hole nozzle. In terms of the averaged droplet size, the group-hole nozzle held an advantage over the single-hole nozzle in decreasing Sauter mean diameter (SMD) by approximately 2 lm. In addition, in comparison to the spatial distribution of droplet diameter and velocity between them, it can be confirmed that the group-hole nozzle has strong effects on reduction in diameter as well as rapid dispersion of droplet due to active air entrainment. These atomization characteristics are considered as an important advantages for improving mixture formation in GDI engine. (C) 2014 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0016236114007145?via%3Dihubhttp://hdl.handle.net/20.500.11754/47041
ISSN
0016-2361
DOI
10.1016/j.fuel.2014.07.063
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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