An experimental study on the phenomenon of flow field around the limbs of cyclists
Reduction of aerodynamic drag is an important topic in the development of a bicycle racing, making it extremely vital to study the flow field phenomenon on the surface of a cyclist. As the wind flows over the human body, the flow separation phenomenon will appear on the surface. The purpose of this...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2023-04-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/18/1/18_2023jfst0008/_pdf/-char/en |
| _version_ | 1827955976316125184 |
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| author | Yu Hsiang CHEN Jiun Jih MIAU Yng Ru CHEN |
| author_facet | Yu Hsiang CHEN Jiun Jih MIAU Yng Ru CHEN |
| author_sort | Yu Hsiang CHEN |
| collection | DOAJ |
| description | Reduction of aerodynamic drag is an important topic in the development of a bicycle racing, making it extremely vital to study the flow field phenomenon on the surface of a cyclist. As the wind flows over the human body, the flow separation phenomenon will appear on the surface. The purpose of this research is to study the aerodynamic characteristics of cyclists by utilizing flow visualization method in both water channel and wind tunnel. Cyclist models used in water channel and wind tunnel testing were based on a real male cyclist and printed using a 3D printer. Flow visualization technique was employed to observe the flow phenomenon around the arms, thighs and calves of the cyclist model. It is found that there are vortices meandering along the axial direction at the arms and thighs, double separation lines appear at the lower legs. Then, the surface pressure coefficient of the model was measured on a full-scale model in wind tunnel experiment to verify the flow condition in the vicinity of the model surface. These research methods help in getting a better understanding of the structure of the flow field around the cyclist, and further achieve the purpose of drag reduction. |
| first_indexed | 2024-04-09T14:56:20Z |
| format | Article |
| id | doaj.art-63a262665156462d8a21678b2d6808c9 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-09T14:56:20Z |
| publishDate | 2023-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-63a262665156462d8a21678b2d6808c92023-05-02T04:54:02ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582023-04-01181JFST0008JFST000810.1299/jfst.2023jfst0008jfstAn experimental study on the phenomenon of flow field around the limbs of cyclistsYu Hsiang CHEN0Jiun Jih MIAU1Yng Ru CHEN2Dept. of Aeronautics and Astronautics, College of Engineering, National Cheng Kung UniversityDept. of Aeronautics and Astronautics, College of Engineering, National Cheng Kung UniversityDept. of Aeronautics and Astronautics, College of Engineering, National Cheng Kung UniversityReduction of aerodynamic drag is an important topic in the development of a bicycle racing, making it extremely vital to study the flow field phenomenon on the surface of a cyclist. As the wind flows over the human body, the flow separation phenomenon will appear on the surface. The purpose of this research is to study the aerodynamic characteristics of cyclists by utilizing flow visualization method in both water channel and wind tunnel. Cyclist models used in water channel and wind tunnel testing were based on a real male cyclist and printed using a 3D printer. Flow visualization technique was employed to observe the flow phenomenon around the arms, thighs and calves of the cyclist model. It is found that there are vortices meandering along the axial direction at the arms and thighs, double separation lines appear at the lower legs. Then, the surface pressure coefficient of the model was measured on a full-scale model in wind tunnel experiment to verify the flow condition in the vicinity of the model surface. These research methods help in getting a better understanding of the structure of the flow field around the cyclist, and further achieve the purpose of drag reduction.https://www.jstage.jst.go.jp/article/jfst/18/1/18_2023jfst0008/_pdf/-char/encyclistaxial vortexaerodynamicflow visualizationflow separation |
| spellingShingle | Yu Hsiang CHEN Jiun Jih MIAU Yng Ru CHEN An experimental study on the phenomenon of flow field around the limbs of cyclists Journal of Fluid Science and Technology cyclist axial vortex aerodynamic flow visualization flow separation |
| title | An experimental study on the phenomenon of flow field around the limbs of cyclists |
| title_full | An experimental study on the phenomenon of flow field around the limbs of cyclists |
| title_fullStr | An experimental study on the phenomenon of flow field around the limbs of cyclists |
| title_full_unstemmed | An experimental study on the phenomenon of flow field around the limbs of cyclists |
| title_short | An experimental study on the phenomenon of flow field around the limbs of cyclists |
| title_sort | experimental study on the phenomenon of flow field around the limbs of cyclists |
| topic | cyclist axial vortex aerodynamic flow visualization flow separation |
| url | https://www.jstage.jst.go.jp/article/jfst/18/1/18_2023jfst0008/_pdf/-char/en |
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