Aerodynamic and Hydrodynamic Investigations on Upscaling Effects and Optimization of Offshore Wind Turbines

Putra, Muhammad Juanda
Scarcity and emission issues of conventional fossil fuels have caused a fast shift to renewable energy over the last decades. Wind energy, as one of the cheapest and most advanced forms of renewable energy, is expected to lead the energy market. A recent trend is to develop bigger wind turbines since upscaled wind turbines' rotor size increases power production and reduces a significant amount of operational and maintenance costs of wind turbines. However, there are strict limitations to the design of onshore wind turbines due to transportation issues. Together with noise problems, land usage, and terrain roughness' effects on the vertical distribution of wind speed, offshore wind energy has become more popular. This study aims to investigate the aerodynamic and hydrodynamic effects of upscaling floating offshore wind turbines. For this purpose, upscaling process of NREL 5 MW, IEA 10 MW, and IEA 15 MW atop the OC4DeepCwind semi-submersible floating platform up to 20 MW is presented, and their performances are compared. To enhance the performance of the upscaled turbines, an aerodynamic optimization using the Blade Element Momentum theory coupled with a multi-objective Genetic Algorithm (GA) via HARP_Opt is carried out. Also, composite all glass layup of the optimized blade is analyzed with Classic Lamination Theory (CLT) in Co-Blade. The open-source code, OpenFAST, is used to analyze both the aero-elastic effects on the rotor and tower, coupled with the hydrodynamic load on the floating platforms. The results show that upscaling is feasible and beneficial. Upscaling increases the natural period in all degrees of freedom (DoF) and reduces the dynamic responses of the FOWT, which results in less movement under the same wave excitation as the baselines. Upscaling also increases the generated power, and optimization of the upscaled blade conservatively improves the performance of the turbines. Further increasing of blade length more than linear scale is needed and recommended to reduce the conservative effects of the upscaled turbines.


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Citation Formats
M. J. Putra, “Aerodynamic and Hydrodynamic Investigations on Upscaling Effects and Optimization of Offshore Wind Turbines,” M.S. - Master of Science, Middle East Technical University, 2022.