Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices
Abstract We present a modified version of the ONERA dynamic stall model for improving the prediction of the unsteady forces and load overshoots generated by the shedding of dynamic stall vortices. The modifications include modeling the chord‐axis forces instead of the wind‐axis forces used originall...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-11-01
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| Series: | Wind Energy |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/we.2627 |
| _version_ | 1819039102385782784 |
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| author | Ayman Mohamed David H. Wood |
| author_facet | Ayman Mohamed David H. Wood |
| author_sort | Ayman Mohamed |
| collection | DOAJ |
| description | Abstract We present a modified version of the ONERA dynamic stall model for improving the prediction of the unsteady forces and load overshoots generated by the shedding of dynamic stall vortices. The modifications include modeling the chord‐axis forces instead of the wind‐axis forces used originally. A novel approach for defining the onset of a dynamic stall is based on the behavior of the chordwise force without correlating the onset empirically. Overshoots in the unsteady aerodynamic loads caused by vortex shedding are modeled by sine‐shaped functions added to the normal force and moment. The onset and duration of these pulses are empirically described in the time domain for convenient use in time‐marching simulations. The modified dynamic stall model is calibrated using a genetic algorithm and compared to experimental data of different airfoils relevant to wind turbine applications. The results show an excellent correlation with the experimental data, particularly in deep dynamic stall, which are characterized by large fluctuations in the aerodynamic loads. |
| first_indexed | 2024-12-21T08:47:52Z |
| format | Article |
| id | doaj.art-f18c9d7ee74b40c99662678e5eaa77b1 |
| institution | Directory Open Access Journal |
| issn | 1095-4244 1099-1824 |
| language | English |
| last_indexed | 2024-12-21T08:47:52Z |
| publishDate | 2021-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Wind Energy |
| spelling | doaj.art-f18c9d7ee74b40c99662678e5eaa77b12022-12-21T19:09:47ZengWileyWind Energy1095-42441099-18242021-11-0124111225124810.1002/we.2627Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vorticesAyman Mohamed0David H. Wood1Mechanical Design and Production Department Cairo University Giza EgyptMechanical Design and Production Department Cairo University Giza EgyptAbstract We present a modified version of the ONERA dynamic stall model for improving the prediction of the unsteady forces and load overshoots generated by the shedding of dynamic stall vortices. The modifications include modeling the chord‐axis forces instead of the wind‐axis forces used originally. A novel approach for defining the onset of a dynamic stall is based on the behavior of the chordwise force without correlating the onset empirically. Overshoots in the unsteady aerodynamic loads caused by vortex shedding are modeled by sine‐shaped functions added to the normal force and moment. The onset and duration of these pulses are empirically described in the time domain for convenient use in time‐marching simulations. The modified dynamic stall model is calibrated using a genetic algorithm and compared to experimental data of different airfoils relevant to wind turbine applications. The results show an excellent correlation with the experimental data, particularly in deep dynamic stall, which are characterized by large fluctuations in the aerodynamic loads.https://doi.org/10.1002/we.2627airfoil pitchingdynamic stall modelONERAunsteadyvortex shedding |
| spellingShingle | Ayman Mohamed David H. Wood Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices Wind Energy airfoil pitching dynamic stall model ONERA unsteady vortex shedding |
| title | Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| title_full | Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| title_fullStr | Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| title_full_unstemmed | Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| title_short | Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| title_sort | modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices |
| topic | airfoil pitching dynamic stall model ONERA unsteady vortex shedding |
| url | https://doi.org/10.1002/we.2627 |
| work_keys_str_mv | AT aymanmohamed modelingdynamicloadsonoscillatingairfoilswithemphasisondynamicstallvortices AT davidhwood modelingdynamicloadsonoscillatingairfoilswithemphasisondynamicstallvortices |