• 신재생에너지
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• 제7권3호
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• pp.92-100
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• 2011

With the increased demand of clean energy and global warming measures, the renewable energy development has been increased recently. The TCP (Tidal Current Power) is one of the ocean renewable energy sources. Having the high tidal energy source in Korea, there are many potential TCP sites with strong current speed. The rotor, which initially converts the energy, is a very important component because it affects the efficiency of the entire system. The rotor performance is determined by various design parameters including number of blades, shape, sectional size, diameters and etc. However, the interactions between devices also contribute significantly to the energy production. The rotor performance considering the interaction needs to be investigated to predict the exact power in the farm. This paper introduces the optimum design of TCP turbine and the performance of devices considering the interference between rotors.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.155-162
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• 2010

Recently, due to high oil prices and environmental pollution issues, interest of alternative energy development increases and the related research is widely conducted. Among those research activities the tidal stream power generation utilizes the tidal flow as its mechanical power resource and less depends on the environmental condition for installation and operation than other renewable energy resources. Therefore the amount of power generated is quite consistent and straightforward to predict. However, research on the tidal stream energy conversion turbine is rarely found. In the present study, two numerical methods were developed and compared for the open water Momentum Theory, which is widely used for wind turbines, was adopted. The moving reference frame method for Computational Fluid Dynamis solver were also used. Hybrid meshing was used for the complex geometry of turbines. The analysis results using each method were compared to figure out a better method for the performance prediction.

• 한국해양환경ㆍ에너지학회지
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• 제17권1호
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• pp.20-26
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• 2014

조류발전 터빈의 효과적인 설계를 위해서는 날개의 변형을 고려한 해석이 필요하다. 날개에 가해지는 유체 하중은 날개 구조를 변형시키고, 터빈의 성능에 영향을 초래한다. 본 연구에서는 수평축 조류발전 터빈의 단독성능을 해석하는 전산유체역학 해석 절차를 개발하였다. 개발한 절차를 이용하여 조류발전 터빈의 성능을 예측하였고 실험결과와 비교하여 검증하였다. 검증된 전산유체역학 방법을 이용하여 복합재 터빈 날개에 대한 유체-구조 연성해석을 수행하였고 강체로 이루어진 터빈 날개에 대한 전산유체역학 해석 결과와 비교하였다.

• 한국해양공학회지
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• 제29권5호
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• pp.366-372
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• 2015

Ocean energy is one of the most promising renewable energy resources. In particular, South Korea is one of the countries where it is economically and technically feasible to develop tidal current power plants to use tidal current energy. In this study, based on the design code for HARP_Opt (Horizontal axis rotor performance optimizer) developed by NREL (National Renewable Energy Laboratory) in the United States, and applying the BEMT (Blade element momentum theory) and GA (Genetic algorithm), the optimal shape design and performance evaluation of the horizontal axis rotor for a 200-kW-class tidal current turbine were performed using different numbers of blades (two or three) and a pitch control method (variable pitch or fixed pitch). As a result, the VSFP (Variable Speed Fixed Pitch) turbine with three blades showed the best performance. However, the performances of four different cases did not show significant differences. Hence, it is necessary when selecting the final design to consider the structural integrity related to the fatigue, along with the economic feasibility of manufacturing the blades.

• 대한기계학회논문집B
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• 제39권8호
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• pp.661-668
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• 2015

본 연구에서는 풍력발전분야의 블레이드 공력설계 및 성능해석에 적용되고 있는 날개요소운동량이론을 이용한 조류터빈 블레이드 형상설계 방법론을 제시하였으며, S814 단일 에어포일로 구성된 2 블레이드 형식의 1MW급 수평축 블레이드 형상설계 결과를 제시하였다. 조류터빈 블레이드는 해양환경에서 운전되는 특성 상 블레이드 팁 근방에서 캐비테이션 발생으로 인한 문제가 상존하므로, 설계초기단계에서 신중히 고려되어야 한다. 본 연구를 통해 설계된 1MW 조류터빈 블레이드의 유동특성분석 및 출력성능해석을 위해 캐비테이션 모델이 고려된 CFD 해석을 수행하였으며, 블레이드 팁 근방 흡입 면 및 압력 면에서 캐비테이션이 발생하고 있음을 확인하였다. 최대 출력계수는 설계 주속비 7의 조건에서 47%로 나타났다.

• 한국유체기계학회 논문집
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• 제13권2호
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• pp.36-40
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• 2010

Tidal current power system is the energy converter which converts the kinetic energy of tidal stream into electric energy. The performance of the rotor which initially converts the energy is determined by various design factors and it should be optimized by the ocean environment of the field. Flow direction changes due to rise and fall of the tides, but horizontal axis turbine is very sensitive to direction of flow. To investigate the rotor performance considering the interaction problems with incidence angle of flow, series of experiments have been conducted. The results and findings are summarized in the paper.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.159.2-159.2
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• 2011

Hyundai Heavy Industries has developed a tidal current energy converter utilizing the accumulated technology as the world largest constructor for ship and offshore structures. The model has two sets of turbines in both ends in order to utilize the bi-directional current flows in flood and ebb tide. The torque produced by turbine in tidal current is directly delivered to generator along the horizontal axis, in which the turbine, gear, generator, gear and turbine are connected successively. The manufactured model for field test has the turbine diameter of 5 meters to produce the maximum power of 500kW at maximum current speed of 5m/s. The technical verification of tidal power converter was performed by means of small scale model test in towing tank as well as field test at the Strait of Uldolmok located in Jindo of Jeollanamdo province. Field test was performed by mounting the tidal current converter on the SEP(Self Elevating Platform) which could lower the 4 vertical legs on the seabed and could elevate platform over the water surface using the hydraulic power for itself. The field test performed for a month shows that power output is similar or larger compared with the expected one in design stage. This paper presents the development of tidal current energy converter and real sea field test by Hyundai Heavy Industries. This project has finished successfully and provided the technical advance toward commercial services for tidal current power generation in the south-west region in Korea.

• 한국가시화정보학회지
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• 제8권2호
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• pp.51-55
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• 2010

Flow characteristics of a free-horizontal-axis-turbine (FHAT) current power generation system have been investigated by the use of a volumetric PTV. Three types of FHAT system (S50, SE50, S65) have been tested under the current speed 1.35 knot, 1.5 knot and 2 knot. The width of the blade installed around the body is 50 mm. Based upon the power generation characteristics of the FHAT, the flow features of the blade have been investigated. Among the three models it has been verified that the S65 is the most appropriate for power generations.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2012년도 전기공동학술대회 논문집
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• pp.154-154
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• 2012

Many suggestions is offered to resolve global warming. Tidal current generation is producing power by switched tidal difference sea water horizontal fluid flow produced by tidal difference using rotor and generator. So, change the angle of inflow condition due to the entrance of efficiency are considered. We therefore investigated three dimensional flow analysis and performance evaluation using commercial ANSYS-CFX code for horizontal axis turbine. Then We also studied three dimensional flow characteristics of a rotating rotor and blade surface streamlines around a rotor. As a result, Cp was highest at TSR 5.5, especially the larger changes in the angle of inflow condition decreased efficiency.

• 해양환경안전학회지
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• 제18권2호
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• pp.145-152
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• 2012

최근 지구온난화 문제가 대두되면서 신재생에너지 개발을 위한 여러 기술적인 해결책이 제시되고 있는데, 그 중 산업적으로 크게 주목을 받고 있는 분야가 바로 해양에너지이다. 삼면이 바다로 둘러싸인 우리나라는 부존자원이 풍부하여 조력, 조류, 파력에너지에 대한 실용화 기술이 요구되고 있으며, 특히 빠른 조류흐름을 이용하는 조류발전은 해양환경에 거의 영향을 끼치지 않는 친환경적인 발전 방법이다. 조류발전은 조수간만에 의해 발생되는 해수의 자연적인 수평 유체흐름을 로터 및 발전기를 설치하여 회전운동으로 변환시켜 전력을 생산하는 발전 형태이다. 조류발전은 로터의 방향에 따라 크게 수평축 형태와 수직축 형태로 구별할 수 있으며, 발전량은 로터 단면의 크기와 조류속도에 따라 큰차이가 난다. 따라서 본 연구는 저수심형 100 kW급 수평축 조류발전 터빈의 성능해석을 위하여 상용 ANSYS-CFX를 이용하여 3차원 유동해석및 성능평가를 수행하였고, 유동해석을 통해 회전하는 로터 블레이드 표면 유선, 로터 주변 3차원 유동특성에 대해 고찰을 하였다. 그 결과 토크는 터빈의 날개가 증가함에 따라 증가하다가 TSR 3.77에서 최대토크가 발생하였으며, 그 이후 날개끝 속도비가 증가해도 토크는 감소하였다. 또한, 설계유속에서 0.38의 최대 출력계수를 얻었다.