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울돌목의 조류발전단지 최적화에 관한 연구

류인호 (목포해양대학교)

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Abstract This paper presents a quantitative method for evaluating tidal energy extraction for the purpose of tidal farming optimization in the Uldolmok waterway located in the southwestern part of the Korean Peninsula, which is well-known for having an impressively fast tidal current. Flow fiel...
Abstract This paper presents a quantitative method for evaluating tidal energy extraction for the purpose of tidal farming optimization in the Uldolmok waterway located in the southwestern part of the Korean Peninsula, which is well-known for having an impressively fast tidal current. Flow field characteristics in the Uldolmok waterway were simulated using a numerical model, ADCIRC(ADvanced CIRCulation) program. According to results of the numerical simulation, the highest tidal elevation and depth-averaged current speed of the Uldolmok is about 2.1m and 5.15m/s. These simulation results were validated through a comparison between calculated and observed data by KHOA(Korea Hydrographic and Oceangraphic Agency). After that, the hydrodynamic modelling data by ADCIRC was inputted to Tidal Farmer. In this study, we utilized horizontal axis tidal turbines with their blade designed using S814 to absorb the high kinetic energy from tidal currents. Each turbine has a rated power output of 500kW. Besides that, the turbines were deployed with different lateral and longitudinal distances to formulate corresponding tidal array layouts, such as centered and staggered configurations. The utility of this method is demonstrated by optimizing an array in an ideal scenario, followed by a more realistic case with different tidal array configurations. The energy yield of the proposed designs is evaluated, based on the hydrodynamic modelling data, impact of sea depth, device installation constraints, and wake effects between turbines on the farm. These formations of the tidal array layouts are then compared to each other to find the optimum design for tidal farming in the Uldolmok waterway. The results of show that the staggered layout has lower energy losses than the centered layout when deployed the same number of tidal turbines. Moreover, the longitudinal spacing between two adjacent turbines is also taken into consideration. It indicates that the 10D longitudinal spacing has about two and a half times higher losses due to wake effect than the 20D longitudinal distance. Besides, it indicates that the centered layout is the least efficient design for tidal farming as it suffers the higher energy loss rate than the staggered formation. Also, when considering the energy yield optimization and the economical aspect, the centered and staggered layouts with 24 turbines were shown to be superior and can be regarded as a better scenario than the layouts with other number of turbines.
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Abstract ⅲ
Nomenclature ⅵ
List of Figures ⅷ
List of Tables ⅺ

제 1 장 서 론 1
1.1 연구배경 1
1.2 조류발전 3
1.2.1 조류의 정의 3
1.2.2 조류발전의 정의 3
1.3 국내·외 연구 동향 7
1.3.1 국내 조류발전 기술 동향 7
1.3.2 국외 조류발전 기술 동향 9
1.4 연구목적 16

제 2 장 조류에너지 분석 및 비교 17
2.1 ADCIRC 모델 18
2.2 기본방정식 19
2.3 ADCIRC 모형 실험 21
2.3.1 실험 개요 및 조건 21
2.3.2 개방 경계조건 22
2.3.3 실험에서의 유한요소 격자구성 24
2.4 해수유동 모델의 결과 및 검증 26
2.4.1 울돌목의 해수유동 모델링 문헌 비교·검증 26
2.4.2 울돌목의 해수유동 모델링 실측자료 비교·검증 33
2.4.3 울돌목의 해수유동 모델링 계산자료 비교·검증 48

제 3 장 조류발전단지 설계 50
3.1 Wake 모델 51
3.1.1 Park model 53
3.1.2 Two-dimensional eddy-viscosity wake model 55
3.2 후류의 간섭 57
3.2.1 종 방향 간섭 59
3.2.2 횡 방향 간섭 65
3.3 조류발전단지 설계 68
3.3.1 중심배열 조류발전단지 배열 68
3.3.2 엇갈림배열 조류발전단지 배열 76

제 4 장 결론 79

참고문헌 81
사진출처 84