Nozzle tip wetting in gasoline direct injection injector and its link with nozzle internal flow
[2];
- 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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE; Honda R&D Americas Inc.
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1659497
- Journal Information:
- International Journal of Engine Research, Vol. 21, Issue 2; ISSN 1468-0874
- Publisher:
- SAGECopyright Statement
- Country of Publication:
- United States
- Language:
- English
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