Environmental Engineering Reference
In-Depth Information
Fig. 2.2 Angle of attack for the rotor of a wind turbine
Table 2.1 Wind conditions for onshore wind turbines in terrain category II according to [12]
Basic parameters according to DIN 1055-4 [12]
a)
Unit Remarks
Wind zone
WZ 1 WZ 2 WZ 3 WZ 4
v
m50
(
¼
v
ref
)
b)
22.5
25.0
27.5
30.0
m/s
50-year return wind,
10-min average
v
e50
¼
2.1
0.5
v
m50
32.6
36.2
39.9
43.5
m/s
50-year return wind,
2-4 s gust
v
m1
¼
0.8
v
m50
18.0
20.0
22.0
24.0
m/s
1-year return wind,
10-min average
v
e1
¼
0.8
v
e50
26.1
29.0
31.9
34.8
m/s
1-year return wind,
2-4 s gust
Additional parameters according to DIBt guideline [9] for dynamic analyses
V
ave
¼
0.18
v
m50
(h)
¼
0.18
v
ref
(h/10)
0.16
m/s
Annual average wind
speed at hub height h [m]
I
15,A
¼
0.18
— Average turbulence
intensity,
class A, for V
hub
¼
15m/s
a
A
¼
2
— Slope parameter for
turbulence characteristics
a)
z
¼
10m above ground level, terrain category II, site altitude
sea level
þ
800m
b)
According to [16], V
ref
(capital V) denotes the wind speed of the 50-year return wind at
hub height h.
