Abstract
Ducted Wind Turbines (DWTs) can be used for energy harvesting in urban areas where non-uniform inflows might be the cause of aerodynamic and acoustic performance degradation. For this reason, an aerodynamic and aeroacoustic analysis of DWTs in yawed inflow condition is performed for two duct geometries: a baseline commercial DWT model, DonQi®, and one with a duct having a higher cross-section camber with respect to the baseline, named DonQi D5. The latter has been obtained from a previous optimization study. A numerical investigation using Lattice-Boltzmann Very-Large-Eddy Simulations is presented. Data confirm that the aerodynamic performance improvement, i.e. increase of the power coefficient, is proportional to the increase of the duct thrust force coefficient. It is found that, placing the DWT at a yaw angle of 7.5°, the aerodynamic performances of the DonQi D5 DWT model are less affected by the yaw angle. On the other hand, this configuration shows an increase of broadband noise with respect to the baseline DonQi® one, both in non-yawed and yawed inflow conditions. This is associated to turbulent boundary layer trailing edge noise due to the turbulent flow structures developing along the surface of the duct.
Highlights
The European Union (EU) aims at reducing greenhouse gas emissions to 80–95% below 1990 levels by 2050 (Barthelmie and Pryor, 2014)
Igra found that the addition of airfoil-shaped flap improves the Ducted Wind Turbines (DWTs) aerodynamic performance by 25% when compared to a single duct configuration
In order to include the viscous effects and the duct geometry on the DWT performance, Dighe et al (2019a) carried a two-dimensional study on duct shape parametrization using Reynolds Averaged Navier Stokes (RANS) simulations. They found that increasing the duct cross-section camber improves the aerodynamic performance of the DWT until separation occurs inside the duct
Summary
The European Union (EU) aims at reducing greenhouse gas emissions to 80–95% below 1990 levels by 2050 (Barthelmie and Pryor, 2014). Kogan and Nissim (1962), Kogan and Seginer (1963), and Igra (1976, 1977, 1981) investigated the DWT concept using one dimensional momentum theory and a series of experiments with an actuator disc (AD) model to represent the turbine They concluded that the power augmentation factor, which is the ratio of the power output for a DWT to that of a bare wind turbine, is dependent on the thrust generated by the duct, the duct exit-area-ratio and the duct’s static pressure recovery. In order to include the viscous effects and the duct geometry on the DWT performance, Dighe et al (2019a) carried a two-dimensional study on duct shape parametrization using RANS simulations They found that increasing the duct cross-section camber improves the aerodynamic performance of the DWT until separation occurs inside the duct.
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