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

Huang, Weidi; Moon, Seoksu; Gao, Ya; Li, Zhilong; Wang, Jin

doi:10.1016/j.fuel.2017.06.012

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

Journal Article · Thu Jun 29 00:00:00 EDT 2017 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2017.06.012· OSTI ID:1461350

Huang, Weidi ^[1]; Moon, Seoksu ^[1]; Gao, Ya ^[2]; Li, Zhilong ^[2]; Wang, Jin ^[2]

National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
Argonne National Lab. (ANL), Argonne, IL (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Isuzu Motors Ltd.; USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1461350

Journal Information:: Fuel, Journal Name: Fuel Journal Issue: C Vol. 206; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
X-ray phase-contrast imaging
diesel injector
diesel spray
eccentric needle motion
spray axial velocity

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

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