표제지

요약

목차

기호설명 10

I. 서론 11

1. 연구 배경 11

2. 연구동향 14

3. 연구 목적 및 방법 17

II. 이론적 고찰 18

1. 틸팅형 풍력터빈의 구조와 작동 원리 18

(1) 캠과 날개 배치 18

(2) 수학적 모델을 통한 캠의 형상설계 20

2. 출력계수 25

3. 주속비 27

III. 해석모델 및 방법 29

1. 해석 모델 29

(1) 날개의 회전과 틸팅 동작 29

(2) 경계조건과 해석 격자 32

2. 해석 방법 34

(1) 난류모델 34

(2) Multiple reference frame 35

IV. 결과 및 고찰 38

1. 토크 및 출력 38

2. 유동 해석 결과 44

(1) 유선 분포 44

(2) 속도 분포 45

(3) 속도 벡터 분포 47

(4) 압력 분포 49

3. 토크의 변화 51

V. 결론 76

참고문헌 77

Abstract 80

Table 1.1. Monthly production and share of renewable energy 12

Table 1.2. Monthly energy generation and share of renewable energy 12

Table 3.1. Azimuth angle of each blade in forward(f-) and backward(b-)... 29

Table 4.1. Torque of the forward blades according to azimuth angle 39

Table 4.2. Torque of the backward blades according to azimuth angle 40

Table 4.3. Torque according to the case 42

Table 4.4. Power according to the case 42

Fig. 1.1. New capacity 2019 installed by region and share top five market 11

Fig. 1.2. Darrieus type invented by Georges Jean Marie Darrieus 15

Fig. 1.3. H-rotor placed in Marsta 15

Fig. 1.4. Savonius type invented by Sigurd Johannes Savonius 16

Fig. 2.1. Wind turbine with tiltable blades 19

Fig. 2.2. Schematic of the present wind turbine with blades 19

Fig. 2.3. Specification of the cam; (a) shape, (b) design structure according to... 21

Fig. 2.4. Geometry and mathematical analysis of a tilting side 22

Fig. 2.5. z and R θ coordinate 23

Fig. 2.6. The horizontal axis reflects the ratio v₂/v₁, the vertical axis is the power coefficient 26

Fig. 2.7. Power coefficient according to tip speed ratio of various wind turbine 28

Fig. 3.1. Behavior of forward blades according to the azimuth angle. Upper... 30

Fig. 3.2. Behavior of backward blades according to the azimuth angle. Upper... 31

Fig. 3.3. Computational domain for simulation 32

Fig. 3.4. Gird construction; (a) complete domain and (b) clustering around the blade 33

Fig. 3.5. Transforming Coordinates to a Rotating Reference Frame 36

Fig. 3.6. Coordinate system for relative velocity 36

Fig. 4.1. Torque variations according to the azimuth angle for various TSRs; (a)... 41

Fig. 4.2. Average torque and power according to the TSR 43

Fig. 4.3. Streamline at the wind turbine with tiltable blades in case of TSR＝0.2 44

Fig. 4.4. Velocity contour according to the case; (a) forward blades, (b) backward... 46

Fig. 4.5. Velocity vectors according to the case; (a) forward blades, (b) backward... 48

Fig. 4.6. Pressure contour according to the case; (a) forward blades, (b) backward... 50

Fig. 4.7. Comparison of pressure and shear stress on front and rear surface of... 52

Fig. 4.8. Comparison of pressure and shear stress on front and rear surface of... 53

Fig. 4.9. Comparison of pressure and shear stress on front and rear surface of... 54

Fig. 4.10. Comparison of pressure and shear stress on front and rear surface of... 55

Fig. 4.11. Comparison of pressure and shear stress on front and rear surface of... 56

Fig. 4.12. Comparison of pressure and shear stress on front and rear surface of... 57

Fig. 4.13. Comparison of pressure and shear stress on front and rear surface of... 58

Fig. 4.14. Comparison of pressure and shear stress on front and rear surface of... 59

Fig. 4.15. Comparison of pressure and shear stress on front and rear surface of... 60

Fig. 4.16. Comparison of pressure and shear stress on front and rear surface of... 61

Fig. 4.17. Comparison of pressure and shear stress on front and rear surface of... 62

Fig. 4.18. Comparison of pressure and shear stress on front and rear surface of... 63

Fig. 4.19. Comparison of pressure and shear stress on front and rear surface of... 64

Fig. 4.20. Comparison of pressure and shear stress on front and rear surface of... 65

Fig. 4.21. Comparison of pressure and shear stress on front and rear surface of... 66

Fig. 4.22. Comparison of pressure and shear stress on front and rear surface of... 67

Fig. 4.23. Comparison of pressure and shear stress on front and rear surface of... 68

Fig. 4.24. Comparison of pressure and shear stress on front and rear surface of... 69

Fig. 4.25. Comparison of pressure and shear stress on front and rear surface of... 70

Fig. 4.26. Comparison of pressure and shear stress on front and rear surface of... 71

Fig. 4.27. Comparison of pressure and shear stress on front and rear surface of... 72

Fig. 4.28. Comparison of pressure and shear stress on front and rear surface of... 73

Fig. 4.29. Comparison of pressure and shear stress on front and rear surface of... 74

Fig. 4.30. Comparison of pressure and shear stress on front and rear surface of... 75