Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity
The wake turbulence structure of a cambered airfoil is studied experimentally, including the effects of surface roughness, at different freestream turbulence levels in a transonic flow. As the level of surface roughness increases, all wake profile quantities broaden significantly and nondimensional...
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| Format: | Article |
| Language: | English |
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Wiley
2006-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/IJRM/2006/60234 |
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| _version_ | 1850217874850840576 |
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| author | Qiang Zhang Phillip M. Ligrani |
| author_facet | Qiang Zhang Phillip M. Ligrani |
| author_sort | Qiang Zhang |
| collection | DOAJ |
| description | The wake turbulence structure of a cambered airfoil is studied experimentally, including the
effects of surface roughness, at different freestream turbulence levels in a transonic flow. As the
level of surface roughness increases, all wake profile quantities broaden significantly and nondimensional
vortex shedding frequencies decrease. Freestream turbulence has little effect on the
wake velocity profiles, turbulence structure, and vortex shedding frequency, especially
downstream of airfoils with rough surfaces. Compared with data from a symmetric airfoil, wake
profiles produced by the cambered airfoils also have significant dependence on surface
roughness, but are less sensitive to variations of freestream turbulence intensity. The cambered airfoil
also produces larger streamwise velocity deficits, and broader wakes compared to the
symmetric airfoil. |
| format | Article |
| id | doaj-art-303f1ab52fdc498698f5af4daa8f61da |
| institution | OA Journals |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-303f1ab52fdc498698f5af4daa8f61da2025-08-20T02:07:57ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342006-01-01200610.1155/IJRM/2006/6023460234Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence IntensityQiang Zhang0Phillip M. Ligrani1Turbomachinery Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PG, UKTurbomachinery Laboratory, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PG, UKThe wake turbulence structure of a cambered airfoil is studied experimentally, including the effects of surface roughness, at different freestream turbulence levels in a transonic flow. As the level of surface roughness increases, all wake profile quantities broaden significantly and nondimensional vortex shedding frequencies decrease. Freestream turbulence has little effect on the wake velocity profiles, turbulence structure, and vortex shedding frequency, especially downstream of airfoils with rough surfaces. Compared with data from a symmetric airfoil, wake profiles produced by the cambered airfoils also have significant dependence on surface roughness, but are less sensitive to variations of freestream turbulence intensity. The cambered airfoil also produces larger streamwise velocity deficits, and broader wakes compared to the symmetric airfoil.http://dx.doi.org/10.1155/IJRM/2006/60234 |
| spellingShingle | Qiang Zhang Phillip M. Ligrani Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity International Journal of Rotating Machinery |
| title | Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity |
| title_full | Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity |
| title_fullStr | Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity |
| title_full_unstemmed | Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity |
| title_short | Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity |
| title_sort | wake turbulence structure downstream of a cambered airfoil in transonic flow effects of surface roughness and freestream turbulence intensity |
| url | http://dx.doi.org/10.1155/IJRM/2006/60234 |
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