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6.3 Rotor performance Aerodynamic rotor performance calculations are carried out u<strong>sin</strong>g an iterative rotor design tool that has been developed as a part of this project on basis of the blade element momentum (BEM) theory, described in appendix B.1. The rotor design tool enables calculation of aerodynamic flow conditions, forces, blade shape and rotor performance. It is intended to be used by EWB in the development of future wind turbines and it is thus de- signed with a spreadsheet interface that provides a certain degree of user-friendliness. ROTOR Details about the design tool, its functions, limitations and usage, can be found in appendix C. Performing analyses for a range of different wind speeds and rotational speeds enables the rendering of rotor power curves that show rotor power output as a function of the rotational speed. Figure 6.18 illustrates the power output for the developed rotor with a di- ameter of 2.7 m at different wind speeds. Wind speeds are shown only up to 14 m/s, where furling is initiated, see section 8.2. Figure 6.18: Rotor power output as a function of rotational speed at wind speeds in the range of 4 m/s to 14 m/s The rotor power curves may be augmented to a system power curve by combining the rotor power output of figure 6.18 with the linear characteristic of the generator, described in section 7.1. An overlay plot of the rotor power output and the generator characteristic is shown on figure 6.19. 59
ROTOR 60 Figure 6.19: Rotor power output and generator characteristics combined Each intersection between the rotor power curves and the generator characteristic repre- sents a point of operation for the wind turbine. Assuming a constant efficiency �g of the generator of 45%, see section 7.1, both the generator input from the rotor Pr and the output Pg may be established as a function of wind speed on figure 6.20. Figure 6.20: Rotor power output Pr and generator output Pg within the wind speed range of 4 m/s to 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
Page 15 and 16: PROBLEM STATEMENT reconfigured with
Page 17 and 18: PROBLEM STATEMENT 10
Page 19 and 20: METHODOLOGY Figure 3.1: Flow chart
Page 21 and 22: METHODOLOGY 14 3.1 Calculation meth
Page 23 and 24: CONCEPTUALISATION the kinetic wind
Page 25 and 26: CONCEPTUALISATION Figure 4.3: (a) D
Page 27 and 28: CONCEPTUALISATION issues due to tur
Page 29 and 30: CONCEPTUALISATION 22 Figure 4.8: Ty
Page 31 and 32: CONCEPTUALISATION � Darrieus 24 F
Page 33 and 34: CONCEPTUALISATION 26 Figure 4.13: G
Page 35 and 36: 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: ROTOR 58 Figure 6.17: Blade attachm
Page 69 and 70: ROTOR 62 Figure 6.22: Efficiency
Page 71 and 72: ROTOR sidering the output from the
Page 73 and 74: ROTOR 66
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 and 88: YAW AND FURLING 80 8.2 Furling syst
Page 89 and 90: YAW AND FURLING 82 8.3 Summary The
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
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NOMENCLATURE 110
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BIBLIOGRAPHY [14] Magenn Power Inc.
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BIBLIOGRAPHY [53] H. J. Larsen, H.
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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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