Nozzle tip wetting in gasoline direct injection injector and its link with nozzle internal flow

Huang, Weidi; Moon, Seoksu; Wang, Jin; Murayama, Kei; Arima, Toshiyuki; Sasaki, Yuzuru; Arioka, Akira

doi:10.1177/1468087419869774

Nozzle tip wetting in gasoline direct injection injector and its link with nozzle internal flow

Journal Article · Thu Aug 15 00:00:00 EDT 2019 · International Journal of Engine Research

DOI:https://doi.org/10.1177/1468087419869774· OSTI ID:1659497

Huang, Weidi ^[1]; ^[2]; Wang, Jin ^[3]; Murayama, Kei ^[4]; Arima, Toshiyuki ^[5]; Sasaki, Yuzuru ^[6]; Arioka, Akira ^[6]

National Inst. of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan). Research Inst. for Energy Conservation
National Inst. of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan). Research Inst. for Energy Conservation; Inha Univ., Incheon, (South Korea). Dept. of Mechanical Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Honda R&D Co., Ltd., Tochigi (Japan). Automobile R&D Center
Honda R&D Co., Ltd., Tochigi (Japan). Aircraft Engine R&D Center
Keihin Corporation, Tochigi (Japan). Tochigi Research & Development Center

Fuel film in the gasoline direct injection injector tip, or so-called nozzle tip wetting, has been found to be an important contributor of particle emissions. Attempts have been made to reduce the nozzle tip wetting by optimizing nozzle geometry designs. However, the inherent mechanism of the nozzle tip wetting formation and its link with nozzle internal flow is still unclear yet due to the lack of direct observations. To overcome this insufficiency, here the nozzle internal flow and the formation process of the nozzle tip wetting were visualized in the real-scale aluminum nozzles using the X-ray phase-contrast technique. Results showed that the needle bouncing, injection pressure, and hole configuration affect the formation of the nozzle tip wetting, while the influence of needle bouncing is the most critical. A further study was conducted to examine the effect of nozzle counterbore diameter on the nozzle tip wetting. It was found that with an increase in counterbore diameter, the nozzle tip wetting slightly increased first and then decreased sharply after the counterbore diameter exceeded 0.40 mm. The mechanisms of the aforementioned phenomena were discussed in detail, which can contribute to the better understandings and control strategies of nozzle tip wetting.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: Honda R&D Americas Inc.; USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1659497

Journal Information:: International Journal of Engine Research, Journal Name: International Journal of Engine Research Journal Issue: 2 Vol. 21; ISSN 1468-0874

Publisher:: SAGECopyright Statement

Country of Publication:: United States

Language:: English

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gasoline direct injection engines
needle motion
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particle emission

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