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Perspectives of Offshore Wind Turbine Substructure Technology of Korea
김우전(Wu-Joan Kim) 한국해양환경·에너지학회 2011 한국해양환경공학회 학술대회논문집 Vol.2011 No.11
세계적으로 신재생에너지에 대한 관심이 지대한데, 그중에서 풍력 발전단지 개발이 활발하며, 특히 육상보다 해상풍력발전단지 조성을 위해 각국이 노력중이다. 하지만 해상에 풍력 발전기를 설치하기 위해서는 파도와 조류 등 거친 해양환경과 해저 지반조건 등을 고려해야 하며, 생산과 설치 등에 비용의 증가를 수반한다. 본 논문에서는 세계 풍력시장을 조망하고, 국내 해상풍력단지 조성계획을 소개하였다. 그리고 해상풍력발전기를 지지하고 고정하기 위한 하부구조물의 종류와 필요기술 등에 대하여 기술하였다. Among renewable energy resource wind power is one of the most probable solutions to supply electricity with measurable capacity. Wind farms are being planned to move into offshore sites out of inland, because of wind quality, turbine size, expandability, etc. The substructure composed of supporting structure and foundation for wind turbine at sea, will increase the capital expenditure of promoting wind farms. The harsh ocean environment such as wave and current, and soil condition at seabed will be obstacles to manufacturing and installing the substructure. In this paper the world wind power market is reviewed in the first. Korea’s plan for building up offshore wind farm is introduced in the second. Then the type of substructure is investigated with the variation of water depth. Finally technological issues to design, manufacture, and install the substructures for offshore wind turbines are addressed.
The Application of CFD for Ship Design
김우전(Wu-Joan Kim),반석호(Suak-Ho Van) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.2
The issues associated with the application of CFD for ship design are addressed. Doubtlessly at the moment, CFD tools are very useful in evaluating hull forms prior to traditional towing tank tests. However, time-consuming pre-processing is an obstacle in the daily application of CFD tools to improve hull forms. The accuracy of computational modeling without sacrificing the usability of CFD system is also to be assessed. The wave generation is still predicted by using potential panel methods, while velocity profiles entering into propeller plane is solved using turbulent flow solvers. The choice of turbulence model is a key to predict nominal wake distribution within acceptable accuracy. The experimental data for CFD validation are invaluable to improve physical and numerical modeling. Other applications of CFD for ship design than hull form improvement are also given. It is certain that CFD can be a cost-effective tool for the design of new and better ships.
Wu-Joan Kim(김우전),Yeon-Seok Park(박연석),Chang-Yong Song(송창용),Jae-Hoon Yoo(유재훈),Dae-Yong Lee(이대용) 한국해양환경·에너지학회 2013 한국해양환경공학회 학술대회논문집 Vol.2013 No.11
본 논문에서는 해상풍력터빈 설치를 위한 지지구조물에 작용하는 파도와 조류에 의한 환경하중에 대하여 조사하였다. 다중 파일로 이루어진 고정식 해상풍력 지지구조물에 대하여 조파수조 시험과 CFD 유동해석이 수행되었다. 먼저 하부구조물 모형에 대하여 조파수조에서 파랑하중을 계측하였다. 또한 수치조파수조를 이용한 CFD 유동해석과 구조물의 동적구조응답해석을 위한 FEM 해석이 이루어졌다. 다음으로 모형 구조물을 예인수조에서 끌면서 조류하중을 계측하였다. 그리고 해저면에 형성되는 조류 점성경계층에 의해 구조물의 다리와 해저면이 만나는 지점에서 발생하는 horse-shoe 보오텍스에 대한 수치모사와 그로 인한 해저면 침식 현상인 scouring에 대한 시뮬레이션을 수행하였다. Environmental loads acting on an offshore structure for wind turbine by waves and current flow were investigated. Both wave tank measurement and CFD simulation were performed with a fixed type offshore wind turbine substructure having multi-piles. In the first, measurement of wave load on the model substructure was carried out at the wave tank. CFD simulation using the numerical wave tank was also done with the design wave condition and FEM analysis for dynamic load response of substructure was calculated. Next, current load was measured by towing the model substructure in the towing tank. Finally the formation of horse-shoe vortices around the juncture of substructure legs and seabed, due to bottom boundary layer, and the resulting scouring phenomena were simulated.