Abstract
This study describes an effectively analytic methodology to investigate the aerodynamic performance of H vertical axis wind turbine (H-VAWT). An in-house code based on double multiple stream tube theory (DMST) coupled with dynamic stall and wake correction is implemented to estimate the power coefficient. Design optimization of airfoil shape is conducted to study the influences of the dynamic stall and turbulent wakes. Airfoil shape is universally investigated by using the Class/Shape function transformation method. The airfoil study shows that the upper curve tends to be less convex than the lower curve in order to extract more energy of the wind upstream and generate less drag of the blade downstream. The optimal results show that the power coefficient increases by 6.5% with the new airfoil shape.
Highlights
A wind turbine is a turbomachine that converts wind’s energy to electrical energy through the use of blades
horizontal-axis wind turbines (HAWTs) usually operate at tip speed ratios about 6 - 10, whereas vertical axis wind turbines (VAWTs) operate at 1.5 - 4 1
The VAWT performance is significantly affected by 3D flows, such as dynamic stall, tip vortices, and wake interference, that cannot be considered in a 2D airfoil analysis
Summary
A wind turbine is a turbomachine that converts wind’s energy to electrical energy through the use of blades. The feature of the vertical axis of rotation perpendicular to the free stream velocity eliminates the need for a steering mechanism and results in more complicated aerodynamics, including various blade angles of attack, dynamic stall, and wake interference. Marco Raciti Castelli et al 6 proposed a horizontal cross-section CFD model to evaluate power efficiency and calculate aerodynamic forces acting on a straight-bladed vertical axis Darrieus wind turbine. Double multiple stream tube theory coupled with dynamic stall and wake correction for aerodynamic investigation of vertical axis wind turbine. A review of the main analytical models used for performance investigation and design of straight blade Darrieus VAWT was conducted by 10. This study describes an effectively analytic methodology to investigate the aerodynamic performance of H vertical axis wind turbine (H-VAWT). Design optimization of the airfoil shape is conducted to study the influences of the dynamic stall and turbulent wakes
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