Page 17 - Wind Energy Handbook

List of Symbols

Note: This list is not exhaustive, and omits many symbols that are unique to
particular chapters

a axial flow induction factor
a9 tangential flow induction factor
a9 t tangential flow induction factor at the blade tip
a 0 two-dimensional lift curve slope, (dC 1 =dÆ)
a 1 constant defining magnitude of structural damping
A, A D rotor swept area
A 1 , A W upstream and downstream stream-tube cross-sectional areas
b face width of gear teeth
c blade chord; Weibull scale parameter
^ c c damping coefficient per unit length
generalized damping coefficient with respect to the ith mode
c i
C decay constant
C(í) Theodorsen’s function, where í is the reduced frequency:
C(í) ¼ F(í) þ iG(í)
sectional drag coefficient
C d
sectional force coefficient (i.e., C d or C 1 as appropriate)
C f
C 1 sectional lift coefficient
C m coefficient of a Kinner pressure distribution
n
C p pressure coefficient
C P power coefficient
C Q torque coefficient
C T thrust coefficient; total cost of wind turbine
C TB total cost of baseline wind turbine
C x coefficient of sectional blade element force normal to the rotor plane
C y coefficient of sectional blade element force parallel to the rotor plane
C(˜r, n) coherence—i.e., normalized cross spectrum – for wind speed
fluctuations at points separated by distance s measured in the across
wind direction
C jk (n) coherence—i.e., normalized cross spectrum – for longitudinal wind
speed fluctuations at points j and k
d streamwise distance between vortex sheets in a wake
pitch diameter of pinion gear
d 1