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조철희,박관규,임성우,김준영,Jo, Chul-Hee,Park, Kwan-Kyu,Im, Sung-Woo,Kim, Jun-Yong 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.1
해양구조물에서 많이 사용되는 K-Joint는 그 구조특성으로 인해 응력집중이 발생하며 최적 설계를 위한 가이드라인제시가 요구된다. 형상특성에 따른 응력집중 현상이 다르게 발생함으로 형상을 결정하는 각종 변수인 ${\alpha},\;{\beta},\;{\gamma},\;{\tau},\;{\theta}$의 변화에 따른 조인트의 응력변화를 분석하였다. 수치적인 패라메트릭 연구를 통해 응력 변화 특성을 제시하였고 주요 요소에 따른 최대 응력값도 나타내었고 수치해석 결과를 실험값과 비교하였다. The K-joint is one of the commonly applied element in offshore structures. Due to its structural configuration, the stress concentration occurs in the joint. Considering the important effect to the structural safety and the design optimization, a design guideline is strongly required. The main variables determining the configuration of K-joint including ${\alpha},\;{\beta},\;{\gamma},\;{\tau}$ and ${\theta}$ are closely investigated to find the individual effect to the Stress to K-joint. The maximum Stress of joint has been differed as per the variation of parameters. The parametric study has been numerically carried out and compare with the experimental data.
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.
조철희(Chul-Hee Jo),김성준(Sung-Jun Kim),정현(Hyun Cheong) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.1
As the demands of ocean resource development increase, many offshore structures are required. To cope with the active ocean developments, many types of construction methods have been applied for offshore facilities, including oil, gas and harbors. One of the challenges is to transport and install the heave bridge caisson. Several construction methods are well understood. However, for the sake of safety and reliability, the F/D installation method can be utilized. While the caisson is carried by an F/D, the mooring force of the tug boat and the structure stability from exiting motions in the dock should be checked against external loadings and sea conditions. The external loads can be classified with wind force, current force, and wave force. In the stability analysis, transportation velocity and draft of F/D are important factors. The dynamic stability and hook load for crane barge installation for the same caisson are also studied. Considering external loads and dominant factors, the stability of caisson during transportation has been investigated.
조철희(Jo Chul-Hee),박관규(Park Kwan-Kyu) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
The current power generation is very suitable renewable energy for the application to Korean western and south coastal regions where characterized as having high current speed. Being different from tidal power generation that needs tremendous dam structure to preserve water, the current power generation utilizes the ocean current flow without damaging to estuary area and its environment. There are still many areas to understand the characteristics of current power generation for the actual field installation. As designing muti module with several rotors, the interaction between rotors will occur that would affect the efficiency and RPM of each rotor. In this study, the interactions caused by gaps between rotors in multi module are studied.
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.
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.
조철희(Chul-Hee Jo),이강희(Kang-Hee Lee),임진영(Jin-Young Yim),노유호(Yu-Ho Rho) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
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.