A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Optimal design and verification tests of cycloidal vertical axis wind turbine
In this paper, research describing a high-efficiency vertical axis wind turbine (VAWT) system is presented. The proposed cycloidal vertical axis wind turbine (CWT) is straight-bladed; adopting the cycloidal blade system that is used as the propulsion system in a cyclocopter. The CWT actively controls the pitch angle of its rotor blades to improve turbine efficiency according to wind conditions. It can self-start by changing its pitch angle pattern and is able to achieve maximum operating efficiency. An optimization scheme based on the response surface method was used to find the most efficient design variables while performing computational fluid dynamics (CFD) analysis with variables including the number of blades, chord length, tip speed ratio, and maximum pitch angle. For the experiments, a 600 W (at 10 m/s of wind speed) class cycloidal VAWT was designed and developed. Two types of experiments were carried out and compared with the CFD results. The first test was a constant wind speed test. The constant wind speed was achieved by driving a truck at constant speed along a straight road with the CWT mounted on the truck. The second test was a field test that was conducted in a certification test site for small wind turbine systems at the Korea Institute of Energy Research in Jeju Island. The result of the constant wind speed test verified the CFD analysis and the field test demonstrated its reliability. Furthermore, another CWT with a flap control device is added in the tip of blades is also studied and designed for the highest efficiency. The flap control device, operated with simple mechanical linkages, can transform the blade airfoil's camber between positive and negative.
Optimal design and verification tests of cycloidal vertical axis wind turbine
In this paper, research describing a high-efficiency vertical axis wind turbine (VAWT) system is presented. The proposed cycloidal vertical axis wind turbine (CWT) is straight-bladed; adopting the cycloidal blade system that is used as the propulsion system in a cyclocopter. The CWT actively controls the pitch angle of its rotor blades to improve turbine efficiency according to wind conditions. It can self-start by changing its pitch angle pattern and is able to achieve maximum operating efficiency. An optimization scheme based on the response surface method was used to find the most efficient design variables while performing computational fluid dynamics (CFD) analysis with variables including the number of blades, chord length, tip speed ratio, and maximum pitch angle. For the experiments, a 600 W (at 10 m/s of wind speed) class cycloidal VAWT was designed and developed. Two types of experiments were carried out and compared with the CFD results. The first test was a constant wind speed test. The constant wind speed was achieved by driving a truck at constant speed along a straight road with the CWT mounted on the truck. The second test was a field test that was conducted in a certification test site for small wind turbine systems at the Korea Institute of Energy Research in Jeju Island. The result of the constant wind speed test verified the CFD analysis and the field test demonstrated its reliability. Furthermore, another CWT with a flap control device is added in the tip of blades is also studied and designed for the highest efficiency. The flap control device, operated with simple mechanical linkages, can transform the blade airfoil's camber between positive and negative.
Optimal design and verification tests of cycloidal vertical axis wind turbine
Lee, Choong Hee (author) / Min, Seung Yong (author) / Park, Cheon Jin (author) / Kim, Seung Jo (author)
2015-11-01
20 pages
Article (Journal)
Electronic Resource
English