Byeongho Hwang - Academia.edu (original) (raw)
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Papers by Byeongho Hwang
Journal of Mechanical Science and Technology, 2018
The benchmarking optimization of a wind farm layout was applied to the offshore wind farm on Jeju... more The benchmarking optimization of a wind farm layout was applied to the offshore wind farm on Jeju Island, Korea. This work focused on optimizing not only the annual energy production (AEP), but also the electrical grid cost and foundation cost. The benchmark wind farm will be installed on the west coast of Jeju. Ten turbines will be constructed in a simple straight line. To predict the aerodynamic loadings of the wind turbines, the Larsen model was used in combination with the unsteady vortex lattice method. The cost models developed by Larsen were used. In order to optimize the wind farm layout, the total optimization framework developed by the Technical University of Denmark, TOPFARM, was used. The results showed that the objective function values, which included the AEP and cost models, were increased, and an irregular layout was produced compared to the baseline layout.
Renewable Energy, 2014
The characteristics of turbine spacing for optimal wind farm efficiency were investigated using c... more The characteristics of turbine spacing for optimal wind farm efficiency were investigated using combined numerical models. The effects of wakes from upstream turbines were predicted by a model capable of determining velocity distributions on a rotor plane, based on Ainslie's approach. The performance results of a wind farm showed good agreement with measurements. The blade element momentum theory, in combination with a dynamic wake model, was applied. Wake model used the results of aerodynamic analysis as input properties. The optimal distance between wind turbines was predicted using a genetic algorithm to maximize efficiency in a wind farm. The results showed that the spacing between the first and the second turbines had the importance to the entire farm's efficiency.
Journal of Renewable and Sustainable Energy, 2013
The influences of iced airfoils on aerodynamic and aeroacoustic properties were studied. In order... more The influences of iced airfoils on aerodynamic and aeroacoustic properties were studied. In order to validate the aerodynamic performance, the experimental results and iced airfoils which were studied by W. J. Jasinski et al were used. Ice accretions on the two S809 wind turbine airfoils were predicted using the NASA LEWICE code. For analysis of aerodynamic performance, the computational fluid dynamics was used over the Reynolds number range 1-2 × 10 6 . To validate aerodynamic performances, lift and drag coefficients were compared to the experimental result. The aeroacoustic analysis is estimated summating TIN noise and the airfoil self-noise. The airfoil self-noise is obtained using aerodynamics data such as a boundary layer thickness. Semi-empirical method proposed by Brooks et al was used. The turbulence inflow noise(TIN) is a dominant noise source because of a complicated shape of leading edge on the iced airfoil. For considering leading edge shapes, therefore, TIN modeling pro...
Journal of Mechanical Science and Technology, 2018
The benchmarking optimization of a wind farm layout was applied to the offshore wind farm on Jeju... more The benchmarking optimization of a wind farm layout was applied to the offshore wind farm on Jeju Island, Korea. This work focused on optimizing not only the annual energy production (AEP), but also the electrical grid cost and foundation cost. The benchmark wind farm will be installed on the west coast of Jeju. Ten turbines will be constructed in a simple straight line. To predict the aerodynamic loadings of the wind turbines, the Larsen model was used in combination with the unsteady vortex lattice method. The cost models developed by Larsen were used. In order to optimize the wind farm layout, the total optimization framework developed by the Technical University of Denmark, TOPFARM, was used. The results showed that the objective function values, which included the AEP and cost models, were increased, and an irregular layout was produced compared to the baseline layout.
Renewable Energy, 2014
The characteristics of turbine spacing for optimal wind farm efficiency were investigated using c... more The characteristics of turbine spacing for optimal wind farm efficiency were investigated using combined numerical models. The effects of wakes from upstream turbines were predicted by a model capable of determining velocity distributions on a rotor plane, based on Ainslie's approach. The performance results of a wind farm showed good agreement with measurements. The blade element momentum theory, in combination with a dynamic wake model, was applied. Wake model used the results of aerodynamic analysis as input properties. The optimal distance between wind turbines was predicted using a genetic algorithm to maximize efficiency in a wind farm. The results showed that the spacing between the first and the second turbines had the importance to the entire farm's efficiency.
Journal of Renewable and Sustainable Energy, 2013
The influences of iced airfoils on aerodynamic and aeroacoustic properties were studied. In order... more The influences of iced airfoils on aerodynamic and aeroacoustic properties were studied. In order to validate the aerodynamic performance, the experimental results and iced airfoils which were studied by W. J. Jasinski et al were used. Ice accretions on the two S809 wind turbine airfoils were predicted using the NASA LEWICE code. For analysis of aerodynamic performance, the computational fluid dynamics was used over the Reynolds number range 1-2 × 10 6 . To validate aerodynamic performances, lift and drag coefficients were compared to the experimental result. The aeroacoustic analysis is estimated summating TIN noise and the airfoil self-noise. The airfoil self-noise is obtained using aerodynamics data such as a boundary layer thickness. Semi-empirical method proposed by Brooks et al was used. The turbulence inflow noise(TIN) is a dominant noise source because of a complicated shape of leading edge on the iced airfoil. For considering leading edge shapes, therefore, TIN modeling pro...