Environmental Engineering Reference
In-Depth Information
Fig. 1.2 A range of small wind turbines. Clockwise from top left the Aerogenesis 5 kW turbine, a
remote power turbine in Nepal (photo Peter Feere), the Rutland 913 (
http://www.marlec.co.uk/
), the
Proven 15 kW (photo Paul Peterson) and the Southwest Windpower Skystream (photo Jim Baxter)
defined as the angle between the turbine's axis and the wind direction.
Yaw reduces the power by a factor of approximately cos
2
h, e.g. Pedersen [
4
] and
Maeda et al. [
5
], and so is significant for even moderate values of h. It is important,
therefore, to minimise yaw. Yaw behaviour will be analysed in
Chap. 8
along with
the associated topics of tailfin design and overspeed protection.
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