Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section
Acoustic measurements were performed using microphone downstream of a 2-D wind turbine blade section in wind tunnel. The experiments have been carried out in both static and oscillatory pitching cases. The latter is usually experienced by the blades in actual circumstances. The microphone was 1.5 ch...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2024-02-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2400_bf6d852ba03ae0fcd38f826895da64d2.pdf |
| _version_ | 1827341335600824320 |
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| author | A. R. Davari S. Hadavand |
| author_facet | A. R. Davari S. Hadavand |
| author_sort | A. R. Davari |
| collection | DOAJ |
| description | Acoustic measurements were performed using microphone downstream of a 2-D wind turbine blade section in wind tunnel. The experiments have been carried out in both static and oscillatory pitching cases. The latter is usually experienced by the blades in actual circumstances. The microphone was 1.5 chords downstream of the airfoil and the measurements were conducted at three transverse positions, i.e. behind the trailing edge, midway between the trailing edge and the ground and very close to the ground. A CFD simulation of the flowfield has also been conducted using Fluent to correlate the acoustic behavior to the phenomena observed in the flowfield around the blade. The results show that the acoustic noise heard by a listener located on the ground is higher and stronger than that positioned downstream of the trailing edge, showing the ground effect on acoustic noise reverberation. The aerodynamic noise heard by the listener, changes from a treble to bass sound as the angle of attack increases. Beyond stall, the flow is dominated by the vortices shed into wake and the acoustic noises would be at very low frequencies which would result in a bass sound accompanied by structural vibration. In high angle of attack range, such noises can hardly be heard by a normal person but have a very destructive role on blade structure. |
| first_indexed | 2024-03-07T21:38:35Z |
| format | Article |
| id | doaj.art-75d9d0b6527e4a788d1d6b2616374ebe |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-03-07T21:38:35Z |
| publishDate | 2024-02-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-75d9d0b6527e4a788d1d6b2616374ebe2024-02-26T10:37:22ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452024-02-0117598098810.47176/jafm.17.05.23472400Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade SectionA. R. Davari0S. Hadavand1Department of Engineering, Tehran Science and Research Branch, Islamic Azad University, Poonak, Tehran, 14155-4933, IranDepartment of Engineering, Tehran Science and Research Branch, Islamic Azad University, Poonak, Tehran, 14155-4933, IranAcoustic measurements were performed using microphone downstream of a 2-D wind turbine blade section in wind tunnel. The experiments have been carried out in both static and oscillatory pitching cases. The latter is usually experienced by the blades in actual circumstances. The microphone was 1.5 chords downstream of the airfoil and the measurements were conducted at three transverse positions, i.e. behind the trailing edge, midway between the trailing edge and the ground and very close to the ground. A CFD simulation of the flowfield has also been conducted using Fluent to correlate the acoustic behavior to the phenomena observed in the flowfield around the blade. The results show that the acoustic noise heard by a listener located on the ground is higher and stronger than that positioned downstream of the trailing edge, showing the ground effect on acoustic noise reverberation. The aerodynamic noise heard by the listener, changes from a treble to bass sound as the angle of attack increases. Beyond stall, the flow is dominated by the vortices shed into wake and the acoustic noises would be at very low frequencies which would result in a bass sound accompanied by structural vibration. In high angle of attack range, such noises can hardly be heard by a normal person but have a very destructive role on blade structure.https://www.jafmonline.net/article_2400_bf6d852ba03ae0fcd38f826895da64d2.pdfsound amplitudesound pressure levelaeroelasticpower spectrumtrailing edge |
| spellingShingle | A. R. Davari S. Hadavand Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section Journal of Applied Fluid Mechanics sound amplitude sound pressure level aeroelastic power spectrum trailing edge |
| title | Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section |
| title_full | Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section |
| title_fullStr | Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section |
| title_full_unstemmed | Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section |
| title_short | Acoustic Noise Measurement Downstream of an Oscillating Wind Turbine Blade Section |
| title_sort | acoustic noise measurement downstream of an oscillating wind turbine blade section |
| topic | sound amplitude sound pressure level aeroelastic power spectrum trailing edge |
| url | https://www.jafmonline.net/article_2400_bf6d852ba03ae0fcd38f826895da64d2.pdf |
| work_keys_str_mv | AT ardavari acousticnoisemeasurementdownstreamofanoscillatingwindturbinebladesection AT shadavand acousticnoisemeasurementdownstreamofanoscillatingwindturbinebladesection |