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Flatback Airfoil의 공력학적 특성 및 이를 적용한 수평축 풍력발전기의 성능변화

A Study on the Aerodynamic Characteristics of Flatback Airfoils and the Performance Prediction of the Horizontal Axis Wind Turbine adopting the Flatback Airfoil

이성건 (SUNG GUN LEE, 포항공과대학교)

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초록 moremore
In recent years, the new and renewable energy became more important to mitigate the global warming. Especially, considering the commercial aspects, the wind energy is now in the spot light among those alternative resources. In this circumstance, the pioneered and advanced countries have been concent...
In recent years, the new and renewable energy became more important to mitigate the global warming. Especially, considering the commercial aspects, the wind energy is now in the spot light among those alternative resources. In this circumstance, the pioneered and advanced countries have been concentrating enormous efforts to develop a state of the art wind energy technologies. To improve the economics of the wind turbine system, the progress of the blade efficiency is the one of the most important factor even though all the other components should be considered from all angles. In past decades, a lot of studies have been devoted to enhance the wind turbine blade performance. This study focuses on the aerodynamic characteristics of an airfoil applied the blunt edge at the root region, or called flatback edge, to investigate its performance. For the mesh generation and numerical simulation, the FLUENT, a commercial CFD software, and ICEM-CFD are used respectively. S809 airfoil and NREL Phase Ⅵ blade are selected as baseline models. Based on the experimental data presented by NREL(National Renewable Energy Laboratory, USA), the identical experiment conditions of the airfoil and blade are used for this study. The models for numerical analysis are blunt trailing-edge airfoils of the trailing-edge thickness to chord ratio of 1%, 5% and 10%. These airfoils and blades are modified from S809 airfoil and NREL Phase Ⅵ blade. To produce the comparable results to the S809 wind tunnel experiment data, the numerical simulation has performed for the angle of attack of 0°, 1.02°, 5.13°, 9.22°, 14.24° and 20.15°. Inaddition, the numerical analysis for blades has performed for the wind speed of 7m/s, 10m/s, 15m/s, 20m/s, and 25m/s respectively. The calculated results for modified airfoils and blades are compared against those of the baseline blade.
목차 moremore
Ⅰ. 개요 1
1.1 연구 배경 1
1.2 연구 내용 및 방법 4
...
Ⅰ. 개요 1
1.1 연구 배경 1
1.2 연구 내용 및 방법 4

Ⅱ. 공력 및 수치해석 이론 7
2.1 공력학적 이론 7
2.1.1 에어포일 7
2.1.2 풍력발전 시스템 9
2.2 수치해석 이론 10
2.2.1 지배방정식 11
2.2.2 난류모델 12
2.2.2.1 Spalart-Allmaras 모델 12
2.2.2.2 k-ω SST 모델 14
2.2.2.3 Transition SST 모델 17

Ⅲ. 에어포일 수치해석 결과 23
3.1 에어포일 형상 23
3.1.1 S809 에어포일 23
3.1.2 S809 Blunt trailing-edge 에어포일 24
3.2 해석 격자 및 방법 24
3.3 에어포일 해석결과 26
3.3.1 난류모델에 따른 해석결과 26
3.3.2 에어포일 형상에 따른 해석결과 32

Ⅳ. 블레이드 수치해석 결과 38
4.1 블레이드 형상 38
4.1.1 NREL Phase Ⅵ 블레이드 38
4.1.2 Blunt trailing-edge 블레이드 39
4.2 해석 조건 및 방법 40
4.3 블레이드 해석결과 42
4.3.1 NREL Phase Ⅵ 풍력발전기 블레이드 해석결과 42
4.3.2 블레이드 형상에 따른 해석결과 51

Ⅴ. 결론 60

참고문헌 63