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싸이클론 환경에서 부이에 연결된 라이저의 안전성을 위한 무어링 설계 방법 연구
노유호(Yu-Ho Rho),조철희(Chul-Hee Jo),김도엽(Do-Youb Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
FPSO는 부유식 원유생산설비에 대한 세계수요 중 가장 높은 비중을 차지하며 특히 해양 유전의 개발 추세가 천해에서 심해로 바뀌면서 FPSO의 필요성은 대두되었다. FPSO 터렛(turret)은 위치에 따라 internal turret과 external turret으로 구분할 수 있다. 그리고 극한 해양환경을 고려하여 FPSO의 service life까지 터렛과 무어링의 연결이 유지되는 permanent turret과 극한 해양 환경에서 무어링과 라이저의 연결을 끊고 다시 연결 할 수 있는d isconnectable turret으로 구분을 할 수 있다. 본 논문은 싸이클론과 같은 극한 해양환경에서 FPSO와 분리된 후 스파이더 부이에 연결된 라이저의 안전성을 확보하기 위하여 무어링 설계 방법에 연구하였. 비다싸이클론 해양환경에서 FPSO와 연결된 라이저의 안전성을 확보하기 위한 무어링 설계를 하고FP SO의 흘수(밸러스트 상태와 풀 밸러스트 상태)에 따른 라이저의 동적해석 후 싸이클론 해양환경에서FP SO와 분리된 스파이더 부이가 안전한 위치에서 운동하는지를 확인하였다.
1.2MW급 부유식 조류발전 시스템 모듈의 계류 안정성 평가
조철희(Chul-Hee Jo),노유호(Yu-Ho Rho),박노식(Ro-Sik Park),홍성준(Seong-Jun Hong) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
To apply a tidal current power in deep water region, a floating module mounted with the turbine together with control system is one of the feasible options. This is because that the cost of conventional pile fixed structure fabrication and Installation increases sharply with the water depth. To stabilize the module m high speed current region, it is critical to design the appropriate mooring system together with the module dynamic behavior. The conceptual research has been conducted to confirm the stability of a mooring system for a 1.2 MW floating tidal current power generation module. The semi submersible module configuration has been adopted to maximize the dynamic stability w.r.t. strong current The 4 point chain mooring concept is applied in the study. The ANSYS AQWA software is used to analysis the mooring tension and excursion of the module under the external forces generated by wind, wave, and current.
조류발전용 수평축 터빈의 형상설계 및 가변 부하를 이용한 성능실험
조철희(Jo, Chul-Hee),노유호(Rho, Yu-Ho),이강희(Lee, Kang-Hee) 한국신재생에너지학회 2012 신재생에너지 Vol.8 No.1
Due to a high tidal range of up to 10 m on the west coast of Korea, numerous tidal current projects are being planned and constructed. The turbine, which initially converts the tidal energy, is an important component because it affects the efficiency of the entire system. Its performance is determined by design variables such as the number of blades, the shape of foils, and the size of a hub. To design a turbine that can extract the maximum power on the site, the depth and duration of current velocity with respect to direction should be considered. Verifying the performance of a designed turbine is important, and requires a circulating water channel (CWC) facility. A physical model for the performance test of the turbine should be carefully designed and compared to results from computational fluid dynamics (CFD) analysis. In this study, a horizontal axis tidal current turbine is designed based on the blade element theory. The proposed turbine's performance is evaluated using both CFD and a CWC experiment. The sealing system, power train, measuring devices, and generator are arranged in a nacelle, and the complete TCP system is demonstrated in a laboratory scale.
조철희(Chul-Hee Jo),노유호(Yu-Ho Rho),이준호(Jun-Ho Lee),이강희(Kang-Hee Lee) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
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. To extract a significant quantity of power, a tidal current farm with a multi-arrangement is necessary in the ocean. The interactions between devices contribute significantly to the total power capacity. Thus, interaction problems needs to be investigated for generating maximum power in a specific field. The study of wake propagation is necessary to understand the evolution of the wake behind a turbine. This paper introduces the unsteady simulations for a tidal turbine wakes by CFD. The downstream wakes of computational models were compared with Jensen's wake model representing theoretical streamwise velocities.
비정상 유동해석을 통한 수평축 조류발전 터빈의 후류 특성 분석
조철희(Chul-Hee Jo),노유호(Yu-Ho Rho),이준호(Jun-Ho Lee),이강희(Kang-Hee Lee) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
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 10m tidal range, there are many suitable site for the application of TCP(Tidal Current Power) in Korea. To extract a significant quantity of power, a tidal current farm with a multi-arrangement is necessary in the ocean. The interactions between devices contribute significantly to the total power capacity. Thus, interaction problems needs to be investigated for generating maximum power in a specific field. The study of wake propagation is necessary to understand the evolution of the wake behind a turbine. This paper introduces the unsteady simulations for a tidal turbine wakes by CFD. The downstream wakes of computational models were compared with Jensen’s wake model representing theoretical streamwise velocities.
조철희(Chul-Hee Jo),노유호(Yu-Ho Rho),이준호(Jun-Ho Lee),이강희(Kang-Hee Lee) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
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. To extract a significant quantity of power, a tidal current farm with a multi-arrangement is necessary in the ocean. The interactions between devices contribute significantly to the total power capacity. Thus, interaction problems needs to be investigated for generating maximum power in a specific field. The study of wake propagation is necessary to understand the evolution of the wake behind a turbine. This paper introduces the unsteady simulations for a tidal turbine wakes by CFD. The downstream wakes of computational models were compared with Jensen"s wake model representing theoretical streamwise velocities.
사보니우스형 조류발전 터빈의 설계 및 회류수조 실험을 통한 성능평가
조철희(Chul-Hee Jo),이준호(Jun-Ho Lee),노유호(Yu-Ho Rho),고광오(Kwang-Oh Ko),이강희(Kang-Hee Lee) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.4
Due to global warning the need to secure alternative resources has become more important nationally. Because of the very strong current on the west coast, with a tidal range of up to 10 m, there are many suitable sites for the applications of TCP (tidal current power) in Korea. In the southwest region, a strong current is created in the narrow channels between the numerous islands. A rotor is an essential component that can convert tidal current energy into rotational energy to generate electricity. The design optimization of a rotor is very important to maximize the power production. The performance of a rotor can be determined using various parameters, including the number of blades, shape sectional size, diameter, etc. There are many offshore jetties and piers with high current velocities. Thus, a VAT (vertical axis turbine) system, which can generate power regardless of flow direction changes, could be effectively applied to cylindrical structures. A VAT system could give an advantage to a caisson-type breakwater because in allows water to circulate well. This paper introduces a multi-layer vertical axis tidal current power system. A Savonius turbine was designed, and a performance analysis was carried out using CFD. A physical model was also demonstrated in CWC, and the reulsts are compared with CFD.