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Title: Eccentric needle motion effect on near-nozzle dynamics of diesel spray

Abstract

Here, the eccentric needle motion has been regarded as an important cause of in-nozzle flow disturbances and hole-to-hole spray variations of modern fuel injectors. However, the experimental investigations on this subject have rarely been reported due to great difficulties in the direct measurements of eccentric needle motion and the flow characteristics of individual holes in an injection nozzle. In this study, the axial and eccentric needle motion and the ear-nozzle spray dynamics of 3-hole, 5-hole and 8-hole diesel injection nozzles were investigated in varied injection pressure conditions using an xray phase-contrast imaging technique. The eccentric needle motion and near-nozzle spray axial velocity showed temporal oscillations during the injection with different oscillation frequencies. The frequencies of these two oscillations were independent to the nozzle and injection pressure. To discuss the mutual dependency of these two oscillations, the time traces of the spray axial velocity were measured for individual holes. The results showed that the oscillation phase, frequency and amplitude of the spray axial velocity were almost identical for all holes, which indicated that the sac pressure variation rather than hole-to-hole flow variation can be the primary cause of the spray axial velocity oscillation by the eccentric needle motion. The adequacy ofmore » this consideration was thoroughly discussed using a mass balance model in the nozzle sac that predicted the sac pressure variation during an injection event.« less

Authors:
 [1];  [1];  [2];  [2];  [2]
  1. National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Isuzu Motors Ltd.; USDOE
OSTI Identifier:
1461350
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Fuel
Additional Journal Information:
Journal Volume: 206; Journal Issue: C; Journal ID: ISSN 0016-2361
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; diesel injector; diesel spray; eccentric needle motion; spray axial velocity; X-ray phase-contrast imaging

Citation Formats

Huang, Weidi, Moon, Seoksu, Gao, Ya, Li, Zhilong, and Wang, Jin. Eccentric needle motion effect on near-nozzle dynamics of diesel spray. United States: N. p., 2017. Web. doi:10.1016/j.fuel.2017.06.012.
Huang, Weidi, Moon, Seoksu, Gao, Ya, Li, Zhilong, & Wang, Jin. Eccentric needle motion effect on near-nozzle dynamics of diesel spray. United States. https://doi.org/10.1016/j.fuel.2017.06.012
Huang, Weidi, Moon, Seoksu, Gao, Ya, Li, Zhilong, and Wang, Jin. 2017. "Eccentric needle motion effect on near-nozzle dynamics of diesel spray". United States. https://doi.org/10.1016/j.fuel.2017.06.012. https://www.osti.gov/servlets/purl/1461350.
@article{osti_1461350,
title = {Eccentric needle motion effect on near-nozzle dynamics of diesel spray},
author = {Huang, Weidi and Moon, Seoksu and Gao, Ya and Li, Zhilong and Wang, Jin},
abstractNote = {Here, the eccentric needle motion has been regarded as an important cause of in-nozzle flow disturbances and hole-to-hole spray variations of modern fuel injectors. However, the experimental investigations on this subject have rarely been reported due to great difficulties in the direct measurements of eccentric needle motion and the flow characteristics of individual holes in an injection nozzle. In this study, the axial and eccentric needle motion and the ear-nozzle spray dynamics of 3-hole, 5-hole and 8-hole diesel injection nozzles were investigated in varied injection pressure conditions using an xray phase-contrast imaging technique. The eccentric needle motion and near-nozzle spray axial velocity showed temporal oscillations during the injection with different oscillation frequencies. The frequencies of these two oscillations were independent to the nozzle and injection pressure. To discuss the mutual dependency of these two oscillations, the time traces of the spray axial velocity were measured for individual holes. The results showed that the oscillation phase, frequency and amplitude of the spray axial velocity were almost identical for all holes, which indicated that the sac pressure variation rather than hole-to-hole flow variation can be the primary cause of the spray axial velocity oscillation by the eccentric needle motion. The adequacy of this consideration was thoroughly discussed using a mass balance model in the nozzle sac that predicted the sac pressure variation during an injection event.},
doi = {10.1016/j.fuel.2017.06.012},
url = {https://www.osti.gov/biblio/1461350}, journal = {Fuel},
issn = {0016-2361},
number = C,
volume = 206,
place = {United States},
year = {Thu Jun 29 00:00:00 EDT 2017},
month = {Thu Jun 29 00:00:00 EDT 2017}
}

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Cited by: 20 works
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Works referenced in this record:

Imaging in the optically dense regions of a spray: A review of developing techniques
journal, October 2013


Comparison of microsac and VCO diesel injector nozzles in terms of internal nozzle flow characteristics
journal, October 2015


Unraveling the Geometry Dependence of In-Nozzle Cavitation in High-Pressure Injectors
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conference, September 2013


Numerical study of the effects of injector needle movement and the nozzle inclination angle on the internal fluid flow and spray structure of a group-hole nozzle layout
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journal, January 2015


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journal, September 2013


Linking instantaneous rate of injection to X-ray needle lift measurements for a direct-acting piezoelectric injector
journal, March 2016


An Eulerian CFD model and X-ray radiography for coupled nozzle flow and spray in internal combustion engines
journal, April 2015


Effect of Off-Axis Needle Motion on Internal Nozzle and Near Exit Flow in a Multi-Hole Diesel Injector
journal, April 2014


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Works referencing / citing this record:

Nozzle tip wetting in gasoline direct injection injector and its link with nozzle internal flow
journal, August 2019