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Tidal Bladed를 이용한 조류발전 지지구조물 설계
고광오(Kwang-Oh Ko),이강희(Kang-Hee Lee),박창범(Chang-Beom Park),조철희(Chul-Hee Jo) 한국연안방재학회 2016 한국연안방재학회지 Vol.3 No.3
The importance of tidal energy has increased steadily throughout the world, and it is recognized as the most reliable energy resource from the ocean. It has great advantages compared to other renewable energy resources due to high energy density in sea water, reliability and predictability. There are many suitable sites for the application of tidal current power (TCP) in Korea because the strong current water area are located in the western and southern coasts with high tidal range up to 10m. Even though many tidal turbines are demonstrated to increase the power efficiency, the cost-saving technologies are still required for economical design of the device. Since the structure and installation cost is dominant in development expense of TCP system, economical supporting structure and installation procedure should be developed. Because the ground conditions of most installation site are rocky bed due to its rapid current, gravity structures are regarded as the most competitive solutions than any other piled structures. Gravity base caisson support structure can be installed with small equipment and the stability can be increased by the injection underwater concrete after the installation. To design the caisson structure which is suitable for the TCP system, integrated load analysis has been carried out using Tidal Bladed considering various design load cases. Multi-body dynamic method was used for interaction between components and dynamic loading on the TCP system was simulated. Calculated load was applied to the design of caisson structure and findings have been summarized in this paper.
최준우(Choi, Jun-Woo),고광오(Ko, Kwang-Oh),윤성범(Yoon, Sung-Bum) 한국해안해양공학회 2009 한국해안해양공학회 논문집 Vol.21 No.2
Lin and Liu(1999)는 VOF기법을 도입한 RANS 방정식 모형을 이용하여 목표 파형을 조파할 수 있도록 연속방정식의 질량 원천항을 이용하는 내부조파기법을 제안하였다. 이로부터 외부조파에 의한 영역 내 재반사 문제가 해결되어 RANS 방정식 모형을 이용한 파랑수치실험이 수행되어 발표되어 왔다. 본 연구에서는 RANS 방정식 모형의 운동량 원천항을 이용한 내부조파기법을 사용하여 목표 파형을 조파할 수 있도록 하였다. FLUENT의 사용자 정의함수를 이용하여 두 조파방법에 대해 수치실험하고 비교하였다. 그리고 조파기법의 적용성을 살펴 보기 위해 Luth et al.(1994)의 수리실험을 수치모의하고 그 결과를 비교하였으며, 수심방향 변화를 보이는 수치 모의 결과들을 제시하고 고찰하였다. For RANS equation model using VOF scheme Lin and Liu (1999) developed internal wave-maker method to generate target wave trains by using designed mass source functions of the continuity equation. By using this method studies on various numerical wave experiments has been achieved without the problem caused by wave reflection due to an external wave-maker. In this study, the wave-maker method to generate target wave trains by using a momentum source function was proposed. The computational results obtained by applying the mass and momentum source functions into FLUENT were compared with each other. To see its applicability, the hydraulic experiment of Luth et al. (1994) were numerically simulated and their measurements are compared with the computations, and the vertical variations of computed results were shown and investigated.
항력식 조류발전 터빈의 최적 형상 설계 및 유동 수치해석을 통한 성능 평가
조철희(Jo, Chul-Hee),고광오(Ko, Kwang-Oh),이준호(Lee, Jun-Ho),이강희(Lee, Kang-Hee) 한국신재생에너지학회 2012 신재생에너지 Vol.8 No.2
Due to global warming, the need to secure an alternative resource has become more important nationally. Having very strong current on the west coast with up to 10 m tidal range, there are many suitable site for the application of TCP (Tidal Current Power) in Korea. On the south west regions between many islands that create strong current in the narrow channels. The rotor is one of the essential components which can convert tidal current energy into rotational energy to generate electricity. The design optimization of rotor is very important to maximize the power production. The performance of rotor can be determined by various parameters including number of blades, shape, sectional size, diameters and etc. This paper introduces the multi-layer vertical axis tidal current power system which can be applied to offshore jetties and piers effectively. Various cases of VAT turbine were designed. Specifically, the number of blades and turbine shape are changed in several cases. Also, performance analysis was carried out by CFD.
변수심에서의 항주파 파형 예측 및 FLOW-3D에 의한 검증
이병욱,이창훈,김용재,고광오,Lee, Byeong Wook,Lee, Changhoon,Kim, Yong Jae,Ko, Kwang Oh 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4
본 연구에서 선형분산관계식의 순환관계를 이용하여 Kelvin (1887)의 이론을 확장함으로써 심해뿐만 아니라 중간수심까지 적용 가능한 항주파의 파형을 예측하는 이론식을 개발하였다. 본 이론식은 일정수심 뿐만 아니라 완경사의 변수심에도 적용 가능하다. 본 연구의 해석해를 검증하기 위하여 FLOW-3D모형을 이용하여 수치실험을 수행하였다. 수치해와 이론해를 비교해본 결과, 본 연구의 이론해는 일정수심 뿐만 아니라 변수심에서도 항주파의 전파 양상을 잘 재현하였다. 평면 경사면 위로 배가 해안선과 나란하게 전파하는 경우 항주파의 전파 양상이 비대칭이 되었다. 즉, 수심이 얕은 곳은 굴절로 인하여 파향선이 해안선과 나란한 경향이 있고, 수심이 깊은 곳은 역굴절로 인하여 파향선이 해안선에 수직인 경향이 있었다. In this study, we developed the equation of ship wave crests in intermediate as well as deep waters by extending Kelvin's (1887) theory using the recursive relation for the dispersion relation. The present equation can be applied for varying water depth as well as constant water depth. Using FLOW-3D we conducted numerical experiments to verify analytical prediction. The ship wave crest patterns became asymmetric on a plane slope when the ship propagates alongshore direction. That is, in shallower side, wave crests tend to be parallel to the coastline due to refraction and, in deeper side, wave crests tend to be orthogonal due to reverse refraction.