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Effect of Nozzle Geometry on Macroscopic Behavior of Diesel Spray in the Near-Nozzle Field
Technical Paper
2013-01-1587
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
In this study, the orifice inlet rounding radii of four diesel
nozzles with different hydro erosive grinding time were measured
based on the x-ray CT scan technology provided by Shanghai
Synchrotron Radiation Facility (SSRF), and a wide parametrical
study of the spray macroscopic behavior in the first 18 mm from the
nozzle tip have been carried out with high speed camera. And then
the influence of orifice inlet rounding radius on the spray
behavior in the near-nozzle field was thoroughly investigated.
The investigation results show that: the mean values of orifice
inlet rounding radii of different nozzles are measured to be on the
order of 21.5-56.8 μm. Although the spray tip penetrations of
different nozzles tend to increase with the hydro erosive grinding
time through statistical analyzing method, the variations of
penetration from nozzles are less than 15% according to different
hydro erosive grinding timing. For the spray cone angle in the
near-nozzle field, the same maximum for nozzles of different hydro
erosive grinding time can be achieved at the unsteady state, but
hydro erosive grinding can shorten the unsteady duration of spray
cone angle. During the steady state of spray, the difference in
spray behavior from nozzles is distinctive and should adopt the
standard deviation of orifice inlet rounding radii to characterize
instead of the mean value. A new correlation is proposed which
accounts for the influence of the orifice inlet rounding radius on
the spray cone angle at the steady state.
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Authors
Citation
Huang, W., Wu, Z., Gong, H., Gao, Y. et al., "Effect of Nozzle Geometry on Macroscopic Behavior of Diesel Spray in the Near-Nozzle Field," SAE Technical Paper 2013-01-1587, 2013, https://doi.org/10.4271/2013-01-1587.Also In
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