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- W4379877348 abstract "The aerodynamic and aeroacoustic characteristics of three scaled model Helical-Darrieus vertical axis wind turbines (VAWT) with helix angles of 45°, 60°, and 120° are examined at a fixed rotational speed of 3500 rpm. A 3D Lattice Boltzmann/Very Large Eddy Simulation is performed using the commercial flow solver PowerFLOW. The predicted power coefficient for the helix 60° turbine demonstrates good agreement with available experimental data. A decrease in blade loading is observed with increasing helix angles. The helical twist generates a mean flow in the spanwise direction, leading to asymmetry in blade loading and wall pressure spectra along the span. The primary flow structures involve tip vortices and their interaction with end plates. Additionally, the helix twist aids in reducing blade wake interaction, as shed structures do not directly impinge on the incoming blade. The flow solution is then also coupled with an in-house aeroacoustic propagation code, SherFWH, based on the Ffowcs Williams and Hawkings analogy for far-field noise propagation. The present numerical predictions for noise at an observer location show excellent agreement with available experimental data for the helix 45° turbine. The leading section of the blade exhibits high wall pressure fluctuations over the azimuthal revolution of the turbine, forming the dominant noise contribution at the blade passing frequencies (BPF), while smaller structures at the blade-end plate junction also contribute to high-frequency broadband noise. As the helix angle increases, both the tonal peaks at the BPFs and the broadband noise decrease due to enhanced flow mixing and three dimensional flow. A 20 dB decrease is seen at the first BPF tonal peak for the helix 120° turbine. Moreover, the helix angle also alters the orientation of the noise directivity, aligning it along the helix angle." @default.
- W4379877348 created "2023-06-09" @default.
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- W4379877348 date "2023-06-08" @default.
- W4379877348 modified "2023-09-26" @default.
- W4379877348 title "Numerical investigation of aerodynamics and aeroacoustics of helical Darrieus wind turbines" @default.
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- W4379877348 doi "https://doi.org/10.2514/6.2023-3641" @default.
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