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This paper presents aerodynamic power outputs of wind turbine of 6 MW wind farm composedof 3 sets of 2 MW wind turbine according to the separation distance by using CFD. Layout design including offshore wind farm and onshore wind farm is key factor for the initial investment cost, annual energy production and maintenance cost. For each wind turbine rotor, not actuator disc model with momentum source but full 3-dimensional model is used for CFD and it has a great technical meaning. Theresults of this study can be applied to the offshore wind farm layout design effectively. Key words: Offshore wind farm, Layout, Computational fluid dynamics, Separation distance, Aerodynamics power output †교신저자(부산대학교 기계공학부, E-mail:kckim@pusan.ac.kr, Tel: 051-510-2324)1 부산대학교 기계공학부 대학원 / (주)디엔디이2 (주)디엔디이 1. 서 론 화석연료 사용 등으로 인한 CO 2 증가는 지구 온난화를 야기하며 기후변화등 인류 생활에 큰 위협이 되고 있다. 이를 극복하기 위한 신․재생에너지에 대한 연구는 선택이 아닌 필수이다[1]. 여러 신․재생에너지원중 풍력에너지는 석탄화력 및 원자력 발전과 대등한 에너지 비용으로 향후 지속적인 성장이 예상된다. 풍력발전은 바람의 운동에너지를 기계적 회전에너지로 변환하고 이를 다시 전기에너지로 변환하는 일종의 에너지 추출기 또는 변환기이다[2]. 향후 기술적 추세는 수 MW급 대형풍력터빈으로 구성된 대규모 해상풍력발전단지가 주류를 이룰 것으로 예상되며 이는 양호한 해상 풍황 조건, 제한된 육상풍력발전단지 부지 및 민원등 여러 요소가 복합된 결과이다[3]. 해상풍력발전단지의 레이아웃 설계는 초기 투자비, 년간 발전량 및 유지 보수비에 영향을 미치는

Most of developed countries, the consumption of fossil fuels has been serious problems that cause serious environment pollution like acid rain, global warming. Also, we have faced that limitation fossil fuels will be exhausted. Currently, small hydropower attracts attention because of its small, clean, renewable, and abundant energy resources to develop. By using a small hydropower generator of which main concept is based on using the different water pressure levels in pipe lines, energy which was initially wasted by use of a reducing valve at the end of the pipeline, is collected by turbine in the hydropower generator. A propeller shaped hydroturbine has been used in order to use this renewable pressure energy. In this study, in order to acquire basic design data of tubular type hydraulic turbine, output power, head, efficiency characteristics due to the flow coefficient are examined in detail. Tubular-turbine among small hydraulic power generation can be used at low-head. The purpose of this study is to research turbine's efficiency due to runner vane angle using CFD analysis.

The world is facing a serious energy problem which destroying the environment. In addition, fossil fuel such as oil and coal that caused global warming and the environmental problems due to acid rain had been gradually exhausted. To solve this problem that has crisis of energy, it is necessary time and effort for research and development of renewable energy in the future. As alternative energy, small hydropower generation which has output of less or equal to 100kW is attracting considerable attention. This is because of its small, simple, renewable, and large amount of energy resources. By using a small hydropower generator of which main concept is based on using the different water pressure levels in pipe lines, energy which was initially wasted by use reducing of a valve at the end of the pipeline, is collected by turbine in the small hydropower generator. In this study, we investigated the influence of the number of runner vanes on the characteristics of tubular-type hydroturbine.