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10 Wind Turbines
The shape of the wind energy distribution is completely different from the shape
of the wind velocity distribution, since the cubic power of the velocity has a strong
effect. The energy average velocity is about 12 m/s.
P v
number of hours with wind velocity v in a year
number of hours i
i
i
( ) =
n n a year (
)
,
8760
P v
yearly energy the wind at velocity v
total yearly energy
i
i
( )
in
i
3
=
n n
.
the wind
Fig. 10.13 Relation between
solidity and design tip speed
ratio. (Adapted to [2])
Fig. 10.14 Distribution of
wind speed and wind energy
flux