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하윤진(Yoon-Jin Ha),이영길(Young-Gill Lee),정광열(Kwang-Leol Jeong),조민태(Min-Tae Cho),강대선(Dae-Sun Kang) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
In this study, the flow characteristics around a vertical-axis wind turbine(VAWT) are investigated by numerical simulations. A vertical-axis wind turbine among existing articles is used as the objective model in the present research. The results of the numerical simulations are compared with the results of the model tests from published articles. Also, a plate is installed on the bottom of the vertical-axis wind turbine and found out about the influences of ike bottom plate. By the bottom plate, the tip vortices are reduced and the fiow characteristics are changed. The power coefficient of the wind turbine with bottom plate is increased by a maximum of 50%. Sizes of the wind turbine are deterntined for 1 kW power generation, and the sizes of them are compared with the other sizes of existing 1 AW class vertical-axis mind turbines. The projected area of the 1 kW wind turbine with bottom plate is reduced by a maximum of 30%. On the other hand, modd analyses are performed to find out the natural frequencies of the 1 kW wind turbine, and the resonance safety of the 1 kW wind turbine is estimated by the results of the modal analyses. The results of the present research could be used as one of the fundamental data to design a 1 kW class vertical-axis wind turbine.
파력발전용 비대칭 로터의 비선형 종동요 운동을 고려한 연간발전량 산출에 관한 연구
하윤진(Yoon-Jin Ha),박지용(Ji Yong Park),김경환(Kyong-Hwan Kim),신승호(Seung Ho Shin) 한국해양환경·에너지학회 2020 한국해양환경·에너지학회 학술대회논문집 Vol.2020 No.7
본 연구에서는 별도의 CFD 해석을 이용하여 주파수영역해석에 의한 비대칭 WEC 로터의 추정된 연간발전량을 보정하는 연구를 수행하였다. 파고변화에 따른 CFD 해석에서는 파고가 증가함에 따라 입사파의 파고로 무차원화된 로터의 운동 크기가 감소하고 로터의 종동요 공진파 주기가 이동하는 현상이 발생하였다. 따라서 선형가정으로 이뤄진 주파수영역해석에 의한 추정된 연간발전량은 다소 과도하게 추정될 수 있기 때문에 CFD 해석결과로부터 그 추정된 연간발전량을 수정하였다. 그 결과로부터 파력발전장치 통합해석 발전량 추정프로그램 개발을 위한 기초자료를 확보하였다. In this study, estimated annual energy production of a asymmetric WEC rotor by a frequency domain analysis was modified using CFD simulations. In the CFD simulation according to wave heights, as increasing wave heights, normalized pitch motions of the rotor by wave heights of incoming waves decrease, and resonance periods of the rotor change in each wave height. The estimated annual energy production of the rotor by the frequency domain analysis was modified from the CFD simulation results, because the annual energy production can be overestimated from the frequency domain analysis based on the linear assumption. The results can be used as fundamental data for development of the establishment of integrated performance tool of wave energy converter
하윤진(Yoon-Jin Ha),이영길(Young-Gill Lee),정광열(Kwang-Leol Jeong),조민태(Min-Tae Cho),강대선(Dae-Sun Kang) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
In this study, the flow characteristics around a vertical-axis wind turbine(VAWT) are investigated by numerical simulations. A vertical-axis wind turbine among existing articles is used as the objective model in the present research. The results of the numerical simulations are compared with the results of the model tests from published articles. Also, a plate is installed on the bottom of the vertical-axis wind turbine and found out about the influences of the bottom plate. By the bottom plate, the tip vortices are reduced and the flow characteristics are changed. The power coefficient of the wind turbine with bottom plate is increased by a maximum of 50%. Sizes of the wind turbine are determined for 1 kW power generation, and the sizes of them are compared with the other sizes of existing 1 kW class vertical-axis wind turbines. The projected area of the 1 kW wind turbine with bottom plate is reduced by a maximum of 30%. On the other hand, modal analyses are performed to find out the natural frequencies of he 1 kW wind turbine, and the resonance safety of the 1 kW wind turbine is estimated by the results of the modal analyses. The results of the present research could be used as one of the fundamental data to design a 1 kW class vertical-axis wind turbine.