sin αst

More documents

Recommendations

Info

B Rotor theory The first section of the present appendix describes the basic theory behind the engineering models used for aerodynamic design and performance calculation. The second section describes the methods used to calculate the theoretically optimum blade shape. Section three contains a thorough description of the rotor design tool that has been developed as a part of this project thesis. B.1 BEM theory The blade element momentum (BEM) analysis combines momentum theory and blade element theory (also known as strip theory). Momentum theory refers to the analysis of blade forces based on conservation of linear and angular momentum, while blade element theory refers to the analysis of forces in concentric ring elements of a rotor. A schematic illustration of blade divided into elements is shown on figure B.1. Figure B.1: Schematic of blade elements 131
LIST OF ATTACHMENTSROTOR THEORY This project thesis uses the BEM method in calculation of steady state rotor performance and in aerodynamic design of the rotor blades. The following equations describe the basics of BEM analysis and form the foundation for the developed rotor design tool described in appendix C. For a complete derivation of the formulas refer to [12, p. 91-153] and [46, p. 20-24], which are to be considered as sources for the following unless otherwise stated. Further reference is made to the nomenclature of chapter 14 that contains the definitions of symbols and subscripts. Figure B.2 shows important velocities, angles and forces acting a ring element of the blade profile. 132 Figure B.2: Velocities, angles and forces on blade element From figure B.2 it is evident that the angle of attack � is given by And that the angle of relative wind � is given by a and a’ refer to axial and tangential interference factors, respectively. For rotors with few blades (B < 5) these are derived u<strong>sin</strong>g the laws of conservation of momentum and angular momentum tan( �) � = � � � = 1 � a 1 � a' V r� (B.1) (B.2)
Page 1 and 2:
WIND TURBINE DESIGN
Page 3 and 4:
ABSTRACT At the request of the Engi
Page 5 and 6:
CONTENTS 1 Introduction ...........
Page 7 and 8:
E Structural analysis of blades ...
Page 9 and 10:
INTRODUCTION members. Today EWB-DK
Page 11 and 12:
INTRODUCTION Figure 1.2: Left pictu
Page 13 and 14:
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 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
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
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
Page 137: LIST OF ATTACHMENTSBASIS FOR CALCUL
Page 141 and 142: LIST OF ATTACHMENTSROTOR THEORY 134
Page 143 and 144: LIST OF ATTACHMENTSROTOR THEORY Cho
Page 145 and 146: LIST OF ATTACHMENTSROTOR THEORY 138
Page 147 and 148: LIST OF ATTACHMENTSROTOR DESIGN TOO
Page 149 and 150: LIST OF ATTACHMENTSROTOR DESIGN TOO
Page 151 and 152: LIST OF ATTACHMENTSAIRFOIL With the
Page 153 and 154: LIST OF ATTACHMENTSAIRFOIL Complete
Page 155 and 156: LIST OF ATTACHMENTSSTRUCTURAL ANALY
Page 189 and 190:
LIST OF ATTACHMENTSSTRUCTURAL ANALY
Page 191 and 192:
LIST OF ATTACHMENTSBLADE ATTACHMENT
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
LIST OF ATTACHMENTSSTRUCTURAL VERIF
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
LIST OF ATTACHMENTSTOWER ANALYSIS T
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
LIST OF ATTACHMENTSFURLING AND YAW
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
LIST OF ATTACHMENTSALTERNATIVE AIRF
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
Page 231:
LIST OF ATTACHMENTSCOMPLIANCE WITH
show all

sin αst

Create successful ePaper yourself

Delete template?

Save as template?