Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air
An experimental study was conducted by performing pressure measurements and flow visualization to investigate unsteady flows inside a two-dimensional semi-open-type nozzle in a ship propulsion equipment directly driven by high-pressure gas. We found that the ejected gas phase and water-flow phase ar...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2008-02-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/3/1/3_1_43/_pdf/-char/en |
| _version_ | 1818943022939766784 |
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| author | Shinsuke TAJIRI Michihisa TSUTAHARA Kazuhiko OGAWA Masahiko SAKAMOTO Masakazu TAJIMA Keisuke AZUMA |
| author_facet | Shinsuke TAJIRI Michihisa TSUTAHARA Kazuhiko OGAWA Masahiko SAKAMOTO Masakazu TAJIMA Keisuke AZUMA |
| author_sort | Shinsuke TAJIRI |
| collection | DOAJ |
| description | An experimental study was conducted by performing pressure measurements and flow visualization to investigate unsteady flows inside a two-dimensional semi-open-type nozzle in a ship propulsion equipment directly driven by high-pressure gas. We found that the ejected gas phase and water-flow phase are separated clearly, and the interface between these phases behaves like waves. It was clarified by flow visualization with a high-speed motion camera and a circulating water channel that these interfacial waves change their shapes according to the water-flow velocity. The interfacial wavelength increases as a result of increasing water-flow velocity, and the mechanism that produces thrust on the nozzle wall changes. The thrust and flow patterns for intermittent gas ejection according to water-flow velocity were also clarified. |
| first_indexed | 2024-12-20T07:20:43Z |
| format | Article |
| id | doaj.art-b86243e41ed7471ea528f2ea712883f3 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-20T07:20:43Z |
| publishDate | 2008-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-b86243e41ed7471ea528f2ea712883f32022-12-21T19:48:41ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582008-02-0131435510.1299/jfst.3.43jfstStudy on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure AirShinsuke TAJIRI0Michihisa TSUTAHARA1Kazuhiko OGAWA2Masahiko SAKAMOTO3Masakazu TAJIMA4Keisuke AZUMA5Graduate School of Science and Technology, Kobe UniversityGraduate School of Science and Technology, Kobe UniversityOsaka Sangyo UniversityNara National College of TechnologyGraduate School of Science and Technology, Kobe UniversityGraduate School of Science and Technology, Kobe UniversityAn experimental study was conducted by performing pressure measurements and flow visualization to investigate unsteady flows inside a two-dimensional semi-open-type nozzle in a ship propulsion equipment directly driven by high-pressure gas. We found that the ejected gas phase and water-flow phase are separated clearly, and the interface between these phases behaves like waves. It was clarified by flow visualization with a high-speed motion camera and a circulating water channel that these interfacial waves change their shapes according to the water-flow velocity. The interfacial wavelength increases as a result of increasing water-flow velocity, and the mechanism that produces thrust on the nozzle wall changes. The thrust and flow patterns for intermittent gas ejection according to water-flow velocity were also clarified.https://www.jstage.jst.go.jp/article/jfst/3/1/3_1_43/_pdf/-char/enship propulsionwater jetinterfacial waveunsteady flowflow visualization |
| spellingShingle | Shinsuke TAJIRI Michihisa TSUTAHARA Kazuhiko OGAWA Masahiko SAKAMOTO Masakazu TAJIMA Keisuke AZUMA Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air Journal of Fluid Science and Technology ship propulsion water jet interfacial wave unsteady flow flow visualization |
| title | Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air |
| title_full | Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air |
| title_fullStr | Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air |
| title_full_unstemmed | Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air |
| title_short | Study on Flow Phenomenon inside a Nozzle in Ship Propulsion Equipment Directly Driven by High Pressure Air |
| title_sort | study on flow phenomenon inside a nozzle in ship propulsion equipment directly driven by high pressure air |
| topic | ship propulsion water jet interfacial wave unsteady flow flow visualization |
| url | https://www.jstage.jst.go.jp/article/jfst/3/1/3_1_43/_pdf/-char/en |
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