풍력발전단지의 풍력터빈 이격거리에 따른 공기역학적 출력 변화에 관한 전산유체해석 연구 = (A) CFD study on aerodynamic power output change according to the wind turbine separation distance of wind farm

다국어 초록 (Multilingual Abstract)

This study presents aerodynamic power outputs of wind turbines for 4 MW and 6 MW wind farm composed of 2 MW wind turbine according to the turbine separation distance by using CFD. CFD has some limitation to meet non-dimensional wall distance and no. of mesh and mesh quality concurrently. But it is most recommendable method to research wind farm aerodynamics because real or scale experiments including wind tunnel test are actually impossible due to the scale effect and wall effect. This study has a meaning by applying CFD to real scale wind turbines of wind farm to evaluate aerodynamics power output change according to the separation distance change. For each wind turbine rotor, not actuator disc model with momentum source but full 3-dimensional model with wind shear is used for CFD analysis. Aerodynamic power out comparison between wake model and CFD results is carried out. There is an aerodynamic power output loss for downstream wind turbine due to the wake from upstream wind turbine. The aerodynamic power output of downstream wind turbine increases as turbine separation distance increases. Aerodynamic power output increasing ratio is different with respect to the separation distance of five times of rotor diameter. Within separation distance of five times of rotor diameter, aerodynamic power output recovers quickly as separation distance increase. For the separation distance over five times of rotor diameter, aerodynamic power output recovers slowly as separation distance increases. So separation distance of five times of rotor diameter is basis for the wind farm layout design. Wind farm layout design especially for the offshore wind farm is a key factor for the initial investment cost, annual energy production and maintenance cost. The results of this study can be applied to the wind farm layout design effectively.

목차 (Table of Contents)

• 제 1장 서 론 1
• 1.1 연구 배경 1
• 1.2 기존 연구 5
• 1.3 연구 목적 및 내용 10
• 제 2장 이론적 배경 14
• 2.1 후류 모델 14
• 2.2 대기 경계층 및 윈드 쉬어 17
• 2.3 년간 발전량 및 발전단지 효율 20
• 제 3장 2 MW 풍력터빈 설계 및 모델링 23
• 3.1 2 MW 풍력터빈 설계 및 모델링 23
• 제 4장 풍력발전단지 모델링 및 전산유체해석 30
• 4.1 풍력발전단지 모델링 30
• 4.1.1 4 MW 풍력발전단지 30
• 4.1.2 6 MW 풍력발전단지 34
• 4.2 4 MW 풍력발전단지 전산유체해석 38
• 4.2.1 격자 38
• 4.2.2 경계 조건 43
• 4.2.3 난류 모델 48
• 4.2.4 결과 고찰 49
• 4.3 6 MW 풍력발전단지 전산유체해석 80
• 4.3.1 격자 80
• 4.3.2 경계 조건 84
• 4.3.3 결과 고찰 87
• 4.4 풍력발전단지 효율 117
• 4.5 축소 풍력발전단지 제언 123
• 제 5장 결론 125
• 참고문헌 127
• Abstract 132