Environmental Engineering Reference
In-Depth Information
1
100
N
R
P E
N
F
= 50 min
-1
-150
-350
-550
-750
0.8
80
P
0.6
60
0.4
40
E
0.2
20
0
0
0
2
4
6
8
10
I
G
A
Figure 20: The output and the induced voltage against the induced electric current.
2
1.5
C
L
1
0.5
0
C
D
-0.5
-5
0
5
10
15
20
a
deg.
Figure 21 : Drag and lift coeffi cient against the attack angle.
account. The fl ow through the wind rotor is contributed by the axial and the tan-
gential induction factors (wind velocity deceleration ratio), and the relative fl ow
angle at the inlet of the front wind rotor
f
F
measured from the tangential direction
and the chord
C
at the radius
r
are given as follows [12], where
l
r
is the speed ratio
at the radius
r
[=(rotational speed at
r
)/wind velocity].
−
1
2
f
=
K
tan
(1 /
l
),
K
=
(1)
F
r
3
8
p
r
[
]
(2 )
C
=
1co (
−
f
)
Fin
ZC
FL
Figure 22 shows the blade profi le with MEL012 aerofoil elements [10] which is
designed by the above procedures.
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