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0.5
Single Wind Rotor G :
b
F
= 0 deg.
Tandem Wind Rotor GG :
b
F
= 5 deg.
0.4
b
R
= 15 deg.
0.3
V
= 10 m/s
D
RF
= 0.84
0.2
L
= 0.08
0.1
0
0
2
4
6
8
10
l
T
Figure 38: Output of tandem wind rotor GG.
Figure 39 shows the performances in the generating mode against the wind veloc-
ity, where the rated wind speed was set at
V
= 10 m/s and
T
is the rotational torque.
The rotational speeds of the front and the rear wind rotors were adjusted at the best
relative tip speed ratio giving the maximum
C
P
in the slower wind speed, and adjusted
so as to keep the output constant in the rated operation. The output is controlled well
with the both wind rotor speeds in place of the traditional mechanism. The abnor-
mally high rotation of the front wind rotor
N
F
can also be suppressed well by the
rotation of the rear wind rotor
N
R
in the blowing mode, at the faster wind velocity.
In the prototype connected to the grid system, the rotational speeds are
adjusted easily by the double rotational armature type doubly fed generator with
the secondary feed.
7 Conclusion
Intelligent wind power unit, which is composed of the tandem wind rotors and
the double rotational armature type generator without the traditional stator,
was proposed.
The performances of the preliminary model tandem wind rotors were investigated
experimentally, as the fi rst step to optimize the profi les of the unit. The desirable
profi les as the tandem wind rotors are that the diameter ratio is
D
RF
= (rear wind
rotor)/(frond wind rotor) = 0.84 and the axial distance between both wind rotors
should be set as short as possible.
The authors are carrying on this research project to be put this wind power unit
to practical use. The optimum profi les will be presented near future.
Some parts of this research project were co-sponsored by Fukuoka Industry,
Science & Technology Foundation, JFE 21st Century Foundation, Research Project:
Grant-in-aid for Scientifi c Research (c) (2) in Japan, Japan Science and Technology
Agency, Iwatani Naoji Memorial Foundation and Research Project: Grant-in-aid for
JSPS fellow.
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