Environmental Engineering Reference
In-Depth Information
its original version the wind turbine on Bogø had long, narrow,
pitch-regulated blades. It was a fast runner, with a DC generator.
During the Second World War, windmills of that kind were erected
all over Denmark, in order to supplement power production from
the many local power plants. Diesel oil was rationed, and by using
wind-diesel systems, it was possible to maintain the necessary
supply.
Figure 7.1
Remaining tower and nacelle of Johannes Juul's first windmill
from 1951 in Vester Egesborg.
After the war, also the island of Bogø changed to alternating
current. By reconstructing the FLS-windmill, according to the
experience gathered in Vester Egesborg, it became possible to use
a much simpler and more future-oriented wind power concept.
Johannes Juul swam, so to speak, against the current. In theory
a modern windmill ought to have narrow, fast blades that could
be pitched in order to yield optimally. But already at the Vester
Egesborg windmill, Juul had decided on fixed blades with a tip speed
of only 38 m/s, whereas the fast runners might turn two to three
times as fast. To ensure that the windmill would not run away it
was equipped with a simple turning mechanism on the tip of the
blades, called tip brakes.
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