Estimation method to achieve a noise reduction effect of airfoil with a serrated trailing edge for wind turbine rotor
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Ryi, Jaeha [1] ; Choi, Jong-Soo [1]
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[1] Chungnam National University
Chungnam National University
Corea del Sur
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- Localización: Noise Control Engineering Journal, ISSN 0736-2501, Vol. 65, Nº. 4, 2017, págs. 345-355
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This article describes a wind tunnel experiment that was undertaken to investigate the changes in the aerodynamic performance of a wind turbine due to the inclusion of a 2D airfoil with a serrated trailing edge designed to reduce the noise caused by a wind turbine rotor blade. The restrictive condition for the serrated trailing edge equipped with the use of a 2D airfoil was examined through the use of a wind tunnel experiment after studying existing restrictive condition and analyzing prior research on serrated trailing edges. The study was conducted according to Howe's theory, which is a cornerstone of the study of noise reduction effects produced by a serrated trailing edge. For the serrated trailing edge equipped on a 2D airfoil, the wake distribution and the relation to noise were analyzed in order to determine the restrictive condition in accordance with Howe's theory. The results indicated that an empirical formula or a theoretical approach should consider changes in the boundary layer thickness of a 2D airfoil, so an empirical noise prediction formula is suggested for the serrated trailing edge. Also, a comparison and an analysis of the prediction and the experimental results for the noise produced by the NACA0012 or the baseline airfoil equipped with a serrated trailing edge suggested a novel formula for a 2D airfoil. Finally, it is confirmed that 2D airfoil noise data are compared with wind tunnel test data by using an empirical formula estimationmethod.
