Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines
We investigated atomized spray droplet size from multi-hole nozzles for direct injection gasoline (DIG) engines. Our findings showed that the droplet size can be described by the nozzle-hole geometry. For the DIG engine, adequate spray pattern and finely atomized spray are important to achieve low e...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2017-06-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/12/1/12_2017jfst0012/_pdf/-char/en |
| _version_ | 1819282236655009792 |
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| author | Motoyuki ABE Eiji ISHII Hideharu EHARA |
| author_facet | Motoyuki ABE Eiji ISHII Hideharu EHARA |
| author_sort | Motoyuki ABE |
| collection | DOAJ |
| description | We investigated atomized spray droplet size from multi-hole nozzles for direct injection gasoline (DIG) engines. Our findings showed that the droplet size can be described by the nozzle-hole geometry. For the DIG engine, adequate spray pattern and finely atomized spray are important to achieve low emission or/and low fuel consumption. As an injector for DIG engines, multiple holes (multi-hole) type nozzle is typically used because of adaptability of spray pattern. The multi-hole type spray has been generally used for Diesel engines, and the characteristics have been investigated in earlier studies. However, multi-hole nozzles for DIG engines require narrow spacing as fuel passage just upstream of the orifice hole. The narrow fuel passage affects spray characteristics including droplet size. This makes droplet size prediction and designing orifice geometry difficult, thus the narrow passage geometry needs to be incorporated as a design parameter. We therefore investigated relation between droplet size and nozzle geometry both experimentally and theoretically. Experimentally, we evaluated an experimental dataset which was done in previous work in which the spray droplet size from the fabricated test sample nozzles, and determined the relationship parameters between nozzle geometries, flow rate, and droplet size. The experimental result in which its pressure range was 1 to 15MPa showed that velocity at outlet of orifice-hole is a dominant factor to determine droplet size, and that the velocity has a correlation with the nozzle geometry. Theoretically, we focused on a pressure-drop at the narrow passage, which can describe velocity at the outlet of the orifice-hole. Finally, theoretical approach described the droplet size by using the orifice geometries incorporating the parameter of narrow passage. |
| first_indexed | 2024-12-24T01:12:23Z |
| format | Article |
| id | doaj.art-bc6b67b801f3447abc07b9ddd126eea1 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T01:12:23Z |
| publishDate | 2017-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-bc6b67b801f3447abc07b9ddd126eea12022-12-21T17:22:51ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582017-06-01121JFST0012JFST001210.1299/jfst.2017jfst0012jfstAtomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline enginesMotoyuki ABE0Eiji ISHII1Hideharu EHARA2Research & Development Group, Hitachi Ltd.Research & Development Group, Hitachi Ltd.Powertrain & Electronic Control Systems Div., Hitachi Automotive Systems, Ltd.We investigated atomized spray droplet size from multi-hole nozzles for direct injection gasoline (DIG) engines. Our findings showed that the droplet size can be described by the nozzle-hole geometry. For the DIG engine, adequate spray pattern and finely atomized spray are important to achieve low emission or/and low fuel consumption. As an injector for DIG engines, multiple holes (multi-hole) type nozzle is typically used because of adaptability of spray pattern. The multi-hole type spray has been generally used for Diesel engines, and the characteristics have been investigated in earlier studies. However, multi-hole nozzles for DIG engines require narrow spacing as fuel passage just upstream of the orifice hole. The narrow fuel passage affects spray characteristics including droplet size. This makes droplet size prediction and designing orifice geometry difficult, thus the narrow passage geometry needs to be incorporated as a design parameter. We therefore investigated relation between droplet size and nozzle geometry both experimentally and theoretically. Experimentally, we evaluated an experimental dataset which was done in previous work in which the spray droplet size from the fabricated test sample nozzles, and determined the relationship parameters between nozzle geometries, flow rate, and droplet size. The experimental result in which its pressure range was 1 to 15MPa showed that velocity at outlet of orifice-hole is a dominant factor to determine droplet size, and that the velocity has a correlation with the nozzle geometry. Theoretically, we focused on a pressure-drop at the narrow passage, which can describe velocity at the outlet of the orifice-hole. Finally, theoretical approach described the droplet size by using the orifice geometries incorporating the parameter of narrow passage.https://www.jstage.jst.go.jp/article/jfst/12/1/12_2017jfst0012/_pdf/-char/endirect injection gasoline enginefuel injectormulti-hole nozzleatomizationdroplet size |
| spellingShingle | Motoyuki ABE Eiji ISHII Hideharu EHARA Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines Journal of Fluid Science and Technology direct injection gasoline engine fuel injector multi-hole nozzle atomization droplet size |
| title | Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines |
| title_full | Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines |
| title_fullStr | Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines |
| title_full_unstemmed | Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines |
| title_short | Atomized spray droplet size prediction from multi-hole nozzle for direct injection gasoline engines |
| title_sort | atomized spray droplet size prediction from multi hole nozzle for direct injection gasoline engines |
| topic | direct injection gasoline engine fuel injector multi-hole nozzle atomization droplet size |
| url | https://www.jstage.jst.go.jp/article/jfst/12/1/12_2017jfst0012/_pdf/-char/en |
| work_keys_str_mv | AT motoyukiabe atomizedspraydropletsizepredictionfrommultiholenozzlefordirectinjectiongasolineengines AT eijiishii atomizedspraydropletsizepredictionfrommultiholenozzlefordirectinjectiongasolineengines AT hideharuehara atomizedspraydropletsizepredictionfrommultiholenozzlefordirectinjectiongasolineengines |