Development of low-noise drag-type vertical wind turbines |
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| Affiliation: | 1. Faculty of Engineering, Mechanical Engineering Department, Urmia University, Urmia, Iran;2. Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran;3. College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AAST) Cairo, Egypt;4. Renewable Energy Lab. Faculty of Engineering-Mattaria, Helwan University, Cairo, Egypt;1. Mechanical Power Engineering Dept. Faculty of Engineering-Mattaria, Helwan University, P.O. 11718, Cairo, Egypt;2. Mechanical Engineering Dept., College of Engineering and Islamic Architecture, Umm Al-Qura University, P.O. 5555, Makkah, Saudi Arabia;1. College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AAST) Cairo, Egypt;2. Mechanical Engineering Dept. York University, Canada;3. Blue Power Co. Besheer Nema St. Heliopolis, Cairo, Egypt;4. Mechanical Power Engineering Dept., Faculty of Engineering-Mattaria, Helwan University, P.O. 11718, Cairo, Egypt;5. Mechanical Engineering Dept., College of Engineering and Islamic Architecture, Umm Al-Qura University, P.O. 5555, Makkah, Kingdom Saudi Arabia |
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| Abstract: | In this study, the aerodynamic noise characteristics of Savonius wind turbines were investigated using hybrid computational aero-acoustics techniques, and low-noise designs were proposed based on the understanding of the noise generation mechanism. First, the flow field around the turbine was analyzed in detail by solving three-dimensional unsteady incompressible Reynolds-averaged Navier–Stokes equations using computational fluid dynamics techniques. Then, the aerodynamic noise radiating from the wind turbine was predicted using the Ffowcs Williams and Hawkings equation with the obtained flow field information. Two distinct harmonic noise components—the blade passing frequency (BPF) and harmonics with a fundamental frequency that is much higher than the BPF—were identified in the predicted noise spectrum. The origin of the higher harmonic components was found to be related to vortex shedding from the rotating turbine. Based on this finding, the proposed low-noise design for Savonius wind turbines uses S-shaped blades. S-shaped blades were found to reduce the noise levels of Savonius wind turbines by up to 2.7 dB. |
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| Keywords: | Aerodynamic noise Drag-type wind turbine Low-noise wind turbine Savonius wind turbine Vertical-axis wind turbine Vortex shedding |
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