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YAW AND FURLING As shown on figure 8.7 the furling axis is tilted compared to the yaw axis. This inclination causes the tail vane to rise during the furling action, thus creating an increase in the po- tential energy of the tail vane. Figure 8.7: Rai<strong>sin</strong>g tail vane. Top: Normal operation. Bottom: Furled operation with inclined tail vane. The instantaneous position of the furled rotor is a balance between the gravity force on the tail vane and the thrust force on the rotor. Equilibrium of the system is established under stationary conditions when the torque around the yaw axis balances the gravity torque around the furling axis. When the wind speed decreases below the critical value of 14 m/s, the rotor is automatically recovered from the furled position and realigned with the wind direction by the restoring moment provided by gravity. Appendix I.2 verifies the overall functionality of the furling mechanism by confirming that furling is initiated at a wind speed of 14 m/s (equivalent to a thrust force of 872 N). The power production beyond the onset of furling is not analysed in the present project, as it is beyond the limitations of the BEM theory described in appendix B.1. 81
YAW AND FURLING 82 8.3 Summary The functionality of the yaw orientation system, which is used to keep the rotor aligned with the wind, was described in detail. The system basically consists of a stationary inner part and an outer part that may rotate by means of a tail vane that is connected to it. The gravity-controlled furling system was also described in detail. It functions as an over- speed and power output control mechanism, which turns the rotor out of the wind at wind speeds beyond 14 m/s.
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WIND TURBINE DESIGN
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ABSTRACT At the request of the Engi
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CONTENTS 1 Introduction ...........
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E Structural analysis of blades ...
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INTRODUCTION members. Today EWB-DK
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INTRODUCTION Figure 1.2: Left pictu
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INTRODUCTION 6
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PROBLEM STATEMENT reconfigured with
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PROBLEM STATEMENT 10
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METHODOLOGY Figure 3.1: Flow chart
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METHODOLOGY 14 3.1 Calculation meth
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CONCEPTUALISATION the kinetic wind
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CONCEPTUALISATION Figure 4.3: (a) D
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CONCEPTUALISATION issues due to tur
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CONCEPTUALISATION 22 Figure 4.8: Ty
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CONCEPTUALISATION � Darrieus 24 F
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CONCEPTUALISATION 26 Figure 4.13: G
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CONCEPTUALISATION Figure 4.14: Powe
Page 37 and 38: CONCEPTUALISATION 30 ID Requirement
Page 39 and 40: CONCEPTUALISATION most suitable sol
Page 41 and 42: CONCEPTUALISATION The embodiment de
Page 43 and 44: DESIGN PRESENTATION The main dimens
Page 45 and 46: DESIGN PRESENTATION The design prop
Page 47 and 48: DESIGN PRESENTATION The background
Page 49 and 50: ROTOR 42 6.1 Number of blades Moder
Page 51 and 52: ROTOR 44 Figure 6.4: Blade design s
Page 53 and 54: ROTOR Table 6.3 provides a material
Page 55 and 56: ROTOR Figure 6.7 displays the lift
Page 57 and 58: ROTOR Figure 6.9: Rotor power outpu
Page 59 and 60: ROTOR 6.2.3 Manufacturing During th
Page 61 and 62: ROTOR 54 The three sides of the tem
Page 63 and 64: ROTOR When the carving process is f
Page 65 and 66: ROTOR 58 Figure 6.17: Blade attachm
Page 67 and 68: ROTOR 60 Figure 6.19: Rotor power o
Page 69 and 70: ROTOR 62 Figure 6.22: Efficiency
Page 71 and 72: ROTOR sidering the output from the
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Page 75 and 76: GENERATOR AND ELECTRICAL SYSTEM 68
Page 77 and 78: GENERATOR AND ELECTRICAL SYSTEM The
Page 79 and 80: GENERATOR AND ELECTRICAL SYSTEM Fig
Page 81 and 82: GENERATOR AND ELECTRICAL SYSTEM 74
Page 83 and 84: YAW AND FURLING For an upwind wind
Page 85 and 86: YAW AND FURLING (16), which are bol
Page 87: YAW AND FURLING 80 8.2 Furling syst
Page 91 and 92: TOWER Concrete tower 84 Figure 9.1:
Page 93 and 94: TOWER 86 Figure 9.4: Turbulent air
Page 95 and 96: TOWER Figure 9.7 shows the tower ba
Page 97 and 98: TOWER models [41, p. 111]. Under ce
Page 99 and 100: ALTERNATIVE BLADE DESIGN 92 10.1 Ai
Page 101 and 102: ALTERNATIVE BLADE DESIGN 94 10.3 Su
Page 103 and 104: DESIGN EVALUATION 96 6 W Low-cost m
Page 105 and 106: DESIGN EVALUATION Weaknesses 1) The
Page 107 and 108: FURTHER DEVELOPMENT � Foundation
Page 109 and 110: FURTHER DEVELOPMENT 102
Page 111 and 112: CONCLUSION proposal is highly flexi
Page 113 and 114: NOMENCLATURE Abbreviation Descripti
Page 115 and 116: NOMENCLATURE Lgs Distance between u
Page 117 and 118: NOMENCLATURE 110
Page 119 and 120: BIBLIOGRAPHY [14] Magenn Power Inc.
Page 121 and 122: BIBLIOGRAPHY [53] H. J. Larsen, H.
Page 123 and 124: LIST OF ATTACHMENTSBASIS FOR CALCUL
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LIST OF ATTACHMENTSROTOR THEORY Thi
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LIST OF ATTACHMENTSROTOR THEORY 134
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LIST OF ATTACHMENTSROTOR THEORY Cho
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LIST OF ATTACHMENTSROTOR THEORY 138
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LIST OF ATTACHMENTSROTOR DESIGN TOO
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LIST OF ATTACHMENTSROTOR DESIGN TOO
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LIST OF ATTACHMENTSAIRFOIL With the
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LIST OF ATTACHMENTSAIRFOIL Complete
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LIST OF ATTACHMENTSSTRUCTURAL ANALY
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LIST OF ATTACHMENTSBLADE ATTACHMENT
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LIST OF ATTACHMENTSSTRUCTURAL VERIF
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LIST OF ATTACHMENTSTOWER ANALYSIS T
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LIST OF ATTACHMENTSFURLING AND YAW
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LIST OF ATTACHMENTSALTERNATIVE AIRF
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LIST OF ATTACHMENTSCOMPLIANCE WITH
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