A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Power generation enhancement in a horizontal axis wind turbine blade using split blades
Abstract The positive effects of a split on the aerodynamic performance of fixed wings are well known. However, for horizontal axis wind turbines (HAWTs), changes in the local angle of attack (AoA) and relative velocities along the blade create complex three-dimensional flow over blades, making the analysis of the split location very challenging. In this paper, the effects of the radial position of a split are investigated using CFD simulations of five different split versions of the NREL Phase VI blade and the original blade. The CFD models are solved as transient simulations at different tip speed ratios (TSRs). Results demonstrate that the power generated by all of the split blades at any TSR<3.5 is higher than the No-split blade. Also, when the split is located at an outer radius, the split blade generates more power. Besides, it was observed that for this stall-regulated wind turbine, at high winds and especially at a stall condition, a blade in which the split extends from the blade root to the blade tip generates considerably higher power than the No-split blade. Finally, to visualize the physical phenomenon behind each case, flow patterns and streamlines of different cases are compared and discussed.
Highlights The split method has been investigated for the power generation of a stall-regulated HAWT. The entirely-split blade generated considerably higher power on this stall-regulated blade. The split was more effective when it was located at an outer position. The split blades increased power generation at separated flow conditions and tip speed ratio <3.5.
Power generation enhancement in a horizontal axis wind turbine blade using split blades
Abstract The positive effects of a split on the aerodynamic performance of fixed wings are well known. However, for horizontal axis wind turbines (HAWTs), changes in the local angle of attack (AoA) and relative velocities along the blade create complex three-dimensional flow over blades, making the analysis of the split location very challenging. In this paper, the effects of the radial position of a split are investigated using CFD simulations of five different split versions of the NREL Phase VI blade and the original blade. The CFD models are solved as transient simulations at different tip speed ratios (TSRs). Results demonstrate that the power generated by all of the split blades at any TSR<3.5 is higher than the No-split blade. Also, when the split is located at an outer radius, the split blade generates more power. Besides, it was observed that for this stall-regulated wind turbine, at high winds and especially at a stall condition, a blade in which the split extends from the blade root to the blade tip generates considerably higher power than the No-split blade. Finally, to visualize the physical phenomenon behind each case, flow patterns and streamlines of different cases are compared and discussed.
Highlights The split method has been investigated for the power generation of a stall-regulated HAWT. The entirely-split blade generated considerably higher power on this stall-regulated blade. The split was more effective when it was located at an outer position. The split blades increased power generation at separated flow conditions and tip speed ratio <3.5.
Power generation enhancement in a horizontal axis wind turbine blade using split blades
Moshfeghi, Mohammad (author) / Hur, Nahmkeon (author)
2020-08-08
Article (Journal)
Electronic Resource
English