Abstract
In this study, the performance of offshore wind turbines at low tip speed ratio (TSR) is studied using computational fluid dynamics (CFD), and the performance of offshore wind turbines at low tip speed ratio (TSR) is improved by revising the blade structure. First, the parameters of vertical axis offshore wind turbine are designed based on the compactness iteration, a CFD simulation model is established, and the turbulence model is selected through simulation analysis to verify the independence of grid and time step. Compared with previous experimental results, it is shown that the two-dimensional simulation only considers the plane turbulence effect, and the simulation turbulence effect performs more obviously at a high tip ratio, while the three-dimensional simulation turbulence effect has well-fitting performance at high tip ratio. Second, a J-shaped blade with optimized lower surface is proposed. The study showed that the optimized J-shaped blade significantly improved its upwind torque and wind energy capture rate. Finally, the performance of the optimized J-blade offshore wind turbine is analyzed.
Highlights
Global warming and rising sea levels have made the search for renewable energy more urgent [1]
The main content of this study is to improve the performance of the Darrieus vertical axis offshore wind turbine, including wind capture efficiency and torque variation
The simulation results based on iteration design of compactness of offshore wind turbine have a good fit with the experimental results
Summary
Global warming and rising sea levels have made the search for renewable energy more urgent [1]. By changing the blade shape, the vertical axis offshore wind turbine can adapt to different working conditions and improve the torque performance and wind energy capture rate of offshore wind turbine. In this study, when the azimuth angle of J-shaped blade is between 60◦ and 180◦ , the torque is improved through resistance, and the influence of the change of the upper surface on the performance of the wind generator is analyzed. Compared with the symmetrical airfoil offshore wind turbine, both the torque and the wind energy capture rate are improved at low tip speed ratio. The proposed J-blade and the optimized J-blade are based on the NACA0018 blade to adopt a single vertical axis offshore wind turbine and to improve the self-starting capacity such that a good wind energy capture rate can be obtained at a low tip speed ratio.
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