Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers
The aerodynamic characteristics of airfoils have been researched in higher Reynolds-number ranges more than 106, in a historic context closely related with the developments of airplanes and fluid machineries in the last century. However, our knowledge is not enough at low and middle Reynolds-number...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2010-09-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/5/3/5_3_447/_pdf/-char/en |
| _version_ | 1819364525228425216 |
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| author | Katsuya HIRATA Masatoshi KAWAKITA Takayoshi IIJIMA Mitsuhiro KOGA Mitsuhiko KIHIRA Jiro FUNAKI |
| author_facet | Katsuya HIRATA Masatoshi KAWAKITA Takayoshi IIJIMA Mitsuhiro KOGA Mitsuhiko KIHIRA Jiro FUNAKI |
| author_sort | Katsuya HIRATA |
| collection | DOAJ |
| description | The aerodynamic characteristics of airfoils have been researched in higher Reynolds-number ranges more than 106, in a historic context closely related with the developments of airplanes and fluid machineries in the last century. However, our knowledge is not enough at low and middle Reynolds-number ranges. So, in the present study, we investigate such basic airfoils as a NACA0015, a flat plate and the flat plates with modified fore-face and after-face geometries at Reynolds number Re < 1.0×105, using two- and three-dimensional computations together with wind-tunnel and water-tank experiments. As a result, we have revealed the effect of the Reynolds number Re upon the minimum drag coefficient CDmin. Besides, we have shown the effects of attack angle α upon various aerodynamic characteristics such as the lift coefficient CL, the drag coefficient CD and the lift-to-drag ratio CL/CD at Re = 1.0×102, discussing those effects on the basis of both near-flow-field information and surface-pressure profiles. Such results suggest the importance of sharp leading edges, which implies the possibility of an inversed NACA0015. Furthermore, concerning the flat-plate airfoil, we investigate the influences of fore-face and after-face geometries upon such effects. |
| first_indexed | 2024-12-24T23:00:19Z |
| format | Article |
| id | doaj.art-45e00bcf0099448aba0312458f02ea64 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-12-24T23:00:19Z |
| publishDate | 2010-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-45e00bcf0099448aba0312458f02ea642022-12-21T16:35:09ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582010-09-015344746310.1299/jfst.5.447jfstNumerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds NumbersKatsuya HIRATA0Masatoshi KAWAKITA1Takayoshi IIJIMA2Mitsuhiro KOGA3Mitsuhiko KIHIRA4Jiro FUNAKI5Department of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityDepartment of Mechanical Engineering, Doshisha UniversityThe aerodynamic characteristics of airfoils have been researched in higher Reynolds-number ranges more than 106, in a historic context closely related with the developments of airplanes and fluid machineries in the last century. However, our knowledge is not enough at low and middle Reynolds-number ranges. So, in the present study, we investigate such basic airfoils as a NACA0015, a flat plate and the flat plates with modified fore-face and after-face geometries at Reynolds number Re < 1.0×105, using two- and three-dimensional computations together with wind-tunnel and water-tank experiments. As a result, we have revealed the effect of the Reynolds number Re upon the minimum drag coefficient CDmin. Besides, we have shown the effects of attack angle α upon various aerodynamic characteristics such as the lift coefficient CL, the drag coefficient CD and the lift-to-drag ratio CL/CD at Re = 1.0×102, discussing those effects on the basis of both near-flow-field information and surface-pressure profiles. Such results suggest the importance of sharp leading edges, which implies the possibility of an inversed NACA0015. Furthermore, concerning the flat-plate airfoil, we investigate the influences of fore-face and after-face geometries upon such effects.https://www.jstage.jst.go.jp/article/jfst/5/3/5_3_447/_pdf/-char/enlow reynolds numberairfoilaerodynamicscfdexperimentwater tankwind tunnel |
| spellingShingle | Katsuya HIRATA Masatoshi KAWAKITA Takayoshi IIJIMA Mitsuhiro KOGA Mitsuhiko KIHIRA Jiro FUNAKI Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers Journal of Fluid Science and Technology low reynolds number airfoil aerodynamics cfd experiment water tank wind tunnel |
| title | Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers |
| title_full | Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers |
| title_fullStr | Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers |
| title_full_unstemmed | Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers |
| title_short | Numerical and Experimental Study on Aerodynamic Characteristics of Basic Airfoils at Low Reynolds Numbers |
| title_sort | numerical and experimental study on aerodynamic characteristics of basic airfoils at low reynolds numbers |
| topic | low reynolds number airfoil aerodynamics cfd experiment water tank wind tunnel |
| url | https://www.jstage.jst.go.jp/article/jfst/5/3/5_3_447/_pdf/-char/en |
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