Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade
This research presents a wind tunnel experiment for investigating three-dimensional flows in the vicinity of a blade in a Horizontal Axis Wind Turbine (HAWT) model. Though the design of the wind turbine blade has been recognized as a modern advance, most of them are based on two-dimensional sectiona...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2015-09-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/10/2/10_2015jfst0013/_pdf/-char/en |
| _version_ | 1818943131342602240 |
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| author | Tinnapob PHENGPOM Yasunari KAMADA Takao MAEDA Junsuke MURATA Shogo NISHIMURA Tasuku MATSUNO |
| author_facet | Tinnapob PHENGPOM Yasunari KAMADA Takao MAEDA Junsuke MURATA Shogo NISHIMURA Tasuku MATSUNO |
| author_sort | Tinnapob PHENGPOM |
| collection | DOAJ |
| description | This research presents a wind tunnel experiment for investigating three-dimensional flows in the vicinity of a blade in a Horizontal Axis Wind Turbine (HAWT) model. Though the design of the wind turbine blade has been recognized as a modern advance, most of them are based on two-dimensional sectional performance analyses. However, the actual flow around the rotating blade also has a flow effect from a span-wise direction that it is generated from centrifugal and Coriolis forces. A span-wise flow can change the boundary layer on the blade surface. The sectional performance strongly depends on the surface boundary layer. Thus, the actual flow characteristics and correct surface boundary layer in the vicinity of a wind turbine blade is important in designing a wind turbine blade with high performance. In this research, the test wind turbine was a three-bladed type. The test blade comprised four types of airfoils that were smoothly connected and distributed along the blade. The experimental investigation of the flow on the blade surface was performed by simultaneously measuring three-dimensional velocity components by the approach of a three-dimensional Laser Doppler Velocimetry (LDV) method: two LDV probes were used in the synchronized measurement of three-dimensional velocity components. Characteristics of the three-dimensional flow were investigated and visualized by velocity vector field, boundary layer and trajectory path. The results clarified that the three-dimensional flow for the inboard had higher values than the outboard. The two-dimensional relative velocity and the span-wise velocity for the optimum tip speed ratio and low tip speed ratio showed significant differences in the boundary thickness. The shape factor H had satisfactory results and could clearly separate laminar and turbulent regions. The flow trajectory seemed to be affected by the span-wise velocity at chord station y/c > 0.25. |
| first_indexed | 2024-12-20T07:22:27Z |
| format | Article |
| id | doaj.art-6dd03f454d724fe0a53e1a3b3364bcfa |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-20T07:22:27Z |
| publishDate | 2015-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-6dd03f454d724fe0a53e1a3b3364bcfa2022-12-21T19:48:39ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582015-09-01102JFST0013JFST001310.1299/jfst.2015jfst0013jfstExperimental investigation of the three-dimensional flow field in the vicinity of a rotating bladeTinnapob PHENGPOM0Yasunari KAMADA1Takao MAEDA2Junsuke MURATA3Shogo NISHIMURA4Tasuku MATSUNO5Graduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityGraduate School of Engineering, Mie UniversityThis research presents a wind tunnel experiment for investigating three-dimensional flows in the vicinity of a blade in a Horizontal Axis Wind Turbine (HAWT) model. Though the design of the wind turbine blade has been recognized as a modern advance, most of them are based on two-dimensional sectional performance analyses. However, the actual flow around the rotating blade also has a flow effect from a span-wise direction that it is generated from centrifugal and Coriolis forces. A span-wise flow can change the boundary layer on the blade surface. The sectional performance strongly depends on the surface boundary layer. Thus, the actual flow characteristics and correct surface boundary layer in the vicinity of a wind turbine blade is important in designing a wind turbine blade with high performance. In this research, the test wind turbine was a three-bladed type. The test blade comprised four types of airfoils that were smoothly connected and distributed along the blade. The experimental investigation of the flow on the blade surface was performed by simultaneously measuring three-dimensional velocity components by the approach of a three-dimensional Laser Doppler Velocimetry (LDV) method: two LDV probes were used in the synchronized measurement of three-dimensional velocity components. Characteristics of the three-dimensional flow were investigated and visualized by velocity vector field, boundary layer and trajectory path. The results clarified that the three-dimensional flow for the inboard had higher values than the outboard. The two-dimensional relative velocity and the span-wise velocity for the optimum tip speed ratio and low tip speed ratio showed significant differences in the boundary thickness. The shape factor H had satisfactory results and could clearly separate laminar and turbulent regions. The flow trajectory seemed to be affected by the span-wise velocity at chord station y/c > 0.25.https://www.jstage.jst.go.jp/article/jfst/10/2/10_2015jfst0013/_pdf/-char/enwind turbineldv measurementboundary layer flowspan-wise flowflow trajectory |
| spellingShingle | Tinnapob PHENGPOM Yasunari KAMADA Takao MAEDA Junsuke MURATA Shogo NISHIMURA Tasuku MATSUNO Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade Journal of Fluid Science and Technology wind turbine ldv measurement boundary layer flow span-wise flow flow trajectory |
| title | Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade |
| title_full | Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade |
| title_fullStr | Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade |
| title_full_unstemmed | Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade |
| title_short | Experimental investigation of the three-dimensional flow field in the vicinity of a rotating blade |
| title_sort | experimental investigation of the three dimensional flow field in the vicinity of a rotating blade |
| topic | wind turbine ldv measurement boundary layer flow span-wise flow flow trajectory |
| url | https://www.jstage.jst.go.jp/article/jfst/10/2/10_2015jfst0013/_pdf/-char/en |
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