sin αst

Symbol Description Unit
a Axial interference factor [-]
A Rotor swept area [m 2 ]
a' Tangential interference factor [-]
NOMENCLATURE
Ab Bearing area [mm 2 ]
Aproj Component area projected on to a plane perpendicular to the
wind direction
AS Aspect ratio [-]
B Number of blades [-]
c Blade chord length [m]
Cd Drag coefficient [-]
Cd.st Coefficient of drag at the onset of stall [-]
Cf Force coefficient [-]
Cl Lift coefficient [-]
Cl.st Coefficient of lift at the onset of stall [-]
Cp Power coefficient [-]
CT Thrust coefficient [-]
Cx Coefficient of tangential forces [-]
Cy Coefficient of axial forces [-]
D Rotor diameter [m]
[m 2 ]
db Bolt diameter [mm]
Db Bearing diameter [mm]
Dpc Bolt pitch diameter [mm]
e Natural logarithm [-]
E Modulus of elasticity [MPa]
er Distance from centre of gravity of the rotor to the rotation axis [m]
Ev Potential energy of tail [J]
F Prandtl’s number [-]
f� Constant [-]
Fd Drag force [N]
fk Characteristic material strength [MPa]
Fk Characteristic capacity [N]
Fl Lift force [N]
FxS Axial shaft load [N]
FzB Force in z direction on the blade at the blade root [N]
g Acceleration due to gravity: 9.81 [m/s 2 ]
G Shear modulus [MPa]
GR Glide ratio [-]
IB Blade mass moment of inertia about rotation axis [kg·m 2 ]
K Factor [-]
kmod Modification factor [-]
Lfs Distance between tower flange and rotor axis [mm]
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