Experimental and numerical study on dynamic stall under a large Reynolds number
Abstract Dynamic stall under large Reynolds numbers and large reduced frequencies has a significant effect on the performance of the wind turbine blades, helicopter rotors, etc. So the dynamic stall physics of the NACA0012 airfoil under a large Reynolds number of Re = 1.5 × 106 was studied using exp...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-05-01
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| Series: | Advances in Aerodynamics |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s42774-023-00146-0 |
| _version_ | 1797827333445386240 |
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| author | Binbin Wei Yongwei Gao Shuling Hu |
| author_facet | Binbin Wei Yongwei Gao Shuling Hu |
| author_sort | Binbin Wei |
| collection | DOAJ |
| description | Abstract Dynamic stall under large Reynolds numbers and large reduced frequencies has a significant effect on the performance of the wind turbine blades, helicopter rotors, etc. So the dynamic stall physics of the NACA0012 airfoil under a large Reynolds number of Re = 1.5 × 106 was studied using experimental and numerical methods. The reduced frequency range was k = 0.035 – 0.1. The unsteady flow field in dynamic stall was studied in detail by using the transient pressure measurement and the numerical simulation based on the unsteady Reynolds-averaged Navier-Stokes (URANS) equation. And the time-frequency characteristics of the dynamic stall were studied using the wavelet analysis. The study showed that the aerodynamic performance during the dynamic stall was dominated by the shear layer vortex (SLV) and the leading edge vortex (LEV), and the phase difference between the SLV and the LEV was the key factor in the existence of the bimodal characteristics of the aerodynamic force/moment. There was a significant linear correlation between the negative peak of the vortex-induced C p and the C n in the reduced frequency range studied in this paper. During the convection of the near-wall LEV to the trailing edge, the high-frequency features firstly decay, and the multi-scale structures of the LEV become more significant as the reduced frequency gradually increases. |
| first_indexed | 2024-04-09T12:46:22Z |
| format | Article |
| id | doaj.art-94ffeed9d01549108907773033e2fe97 |
| institution | Directory Open Access Journal |
| issn | 2524-6992 |
| language | English |
| last_indexed | 2024-04-09T12:46:22Z |
| publishDate | 2023-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Advances in Aerodynamics |
| spelling | doaj.art-94ffeed9d01549108907773033e2fe972023-05-14T11:29:13ZengSpringerOpenAdvances in Aerodynamics2524-69922023-05-015112010.1186/s42774-023-00146-0Experimental and numerical study on dynamic stall under a large Reynolds numberBinbin Wei0Yongwei Gao1Shuling Hu2School of Aerospace Engineering, Xi’an Jiaotong UniversitySchool of Aeronautics, Northwestern Polytechnical UniversitySchool of Aerospace Engineering, Xi’an Jiaotong UniversityAbstract Dynamic stall under large Reynolds numbers and large reduced frequencies has a significant effect on the performance of the wind turbine blades, helicopter rotors, etc. So the dynamic stall physics of the NACA0012 airfoil under a large Reynolds number of Re = 1.5 × 106 was studied using experimental and numerical methods. The reduced frequency range was k = 0.035 – 0.1. The unsteady flow field in dynamic stall was studied in detail by using the transient pressure measurement and the numerical simulation based on the unsteady Reynolds-averaged Navier-Stokes (URANS) equation. And the time-frequency characteristics of the dynamic stall were studied using the wavelet analysis. The study showed that the aerodynamic performance during the dynamic stall was dominated by the shear layer vortex (SLV) and the leading edge vortex (LEV), and the phase difference between the SLV and the LEV was the key factor in the existence of the bimodal characteristics of the aerodynamic force/moment. There was a significant linear correlation between the negative peak of the vortex-induced C p and the C n in the reduced frequency range studied in this paper. During the convection of the near-wall LEV to the trailing edge, the high-frequency features firstly decay, and the multi-scale structures of the LEV become more significant as the reduced frequency gradually increases.https://doi.org/10.1186/s42774-023-00146-0Dynamic stallDynamic stall vortex (DSV)Leading edge vortex (LEV)Time-frequency analysisWavelet analysis |
| spellingShingle | Binbin Wei Yongwei Gao Shuling Hu Experimental and numerical study on dynamic stall under a large Reynolds number Advances in Aerodynamics Dynamic stall Dynamic stall vortex (DSV) Leading edge vortex (LEV) Time-frequency analysis Wavelet analysis |
| title | Experimental and numerical study on dynamic stall under a large Reynolds number |
| title_full | Experimental and numerical study on dynamic stall under a large Reynolds number |
| title_fullStr | Experimental and numerical study on dynamic stall under a large Reynolds number |
| title_full_unstemmed | Experimental and numerical study on dynamic stall under a large Reynolds number |
| title_short | Experimental and numerical study on dynamic stall under a large Reynolds number |
| title_sort | experimental and numerical study on dynamic stall under a large reynolds number |
| topic | Dynamic stall Dynamic stall vortex (DSV) Leading edge vortex (LEV) Time-frequency analysis Wavelet analysis |
| url | https://doi.org/10.1186/s42774-023-00146-0 |
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