The payback period decreases by 3.42 years, 7.68 months, and 6.36 months for Scenarios 1, 2, and 3. Economic assessment of a ducted turbine for three scenarios belonging to Germany and Italy shows a 15.3% decline in cost per electricity production. A smoke visualization technique helps vortex study. Nevertheless, in some cases, employing a duct can contribute to the power reduction if the solidity exceeds a critical value. The power coefficient of a ducted PD with a solidity of 0.3 is augmented by up to 30%. Both experimental and numerical results agree that the power coefficient highly depends on the solidities of the PD. In addition, experimental and numerical tests examine the effect of PDs solidity on the performance of diffuser augmented wind turbines and the corresponding economic analysis. PDs within a duct help estimate any given duct's maximum available power extraction capability. Using a porous disc (PD) instead of a wind turbine rotor makes the study cost and time effective. A method is organized for achieving the improved generated power and the wind speed augmentation with fixed geometry of duct regardless of the type of the turbine, which is the aim of building designers.
As buildings' walls may act as a duct for the turbine, this study focuses on a ducted wind turbine with a fixed duct geometry. Recent development in using wind turbines for urban areas results in inserting turbines inside buildings. Results showed that the presence of a single deflector increases the highest value of the moment coefficient of the bare configuration by 24%, either increases the negative torque values, while two defectors increase the maximum value by 22% and the overall average value of the moment coefficient over the optimal range for the tip speed ratio. Computational Fluid Dynamics (CFD) models were validated to provide novel insights on the effect of the deflectors on the aerodynamic characteristics of a VAWT blades.
Airfoil shapes verification#
Model verification and validation were performed through comparing the model solutions using different mesh sizes, time steps, turbulent models, and discretization schemes. A two dimensional, incompressible, transient, and turbulent flow model was built up in order to simulate the air flow around the turbine blades. The turbine performance before and after adding different wind rotor barriers was compared. The impact of this addition has been investigated and discussed through different deflector configurations. This paper aims to enhance the performance of H-Darrieus Vertical Axis Wind Turbine (VAWT) via introducing upstream deflectors.
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