Environmental Engineering Reference
In-Depth Information
Low Reynolds Number Profiles
Profile 1
Profile 2
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0
0.2
0.4
0.6
0.8
1
x/c
Figure 19: Outline of a low Reynolds number profi le.
Low Reynolds number Profile
Low Reynolds number Profile
2
2
L2D
1.5
1.5
1
1
0.5
0.5
0
0
-0.5
-0.5
-1
-1
-4
-2
0
2
4
6
8
10
0
0.01
0.02
0.03
0.04
0.05
Angle of Attack (deg)
Cd
Figure 20: Polar of low Reynolds number profi les.
max
and P-series). As already and often mentioned, this has led to a
c
close to the
P
theoretical maximum.
6.3 Multi MW turbines
Since around 2000 the off-shore use of wind energy has progressed, one of the fi rst
being the wind farm Middlegrunden close to Copenhagen, which started operation
in 2000. It soon became clear that, due to the narrow time frame available to reach
the wind farm off-shore, they have to be much larger than usual wind turbines.
Especially in Germany the development of so-called Multi Megawatt turbines has
started, these now reaching 6 MW rated power. In this connection several questions
arise. Do the aerodynamic properties stay the same when upscaling the blades?
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