Environmental Engineering Reference
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Front wind rotor
Rear wind rotor
W ind direction
Outer armature
Inner armature
Figure 6 : Intelligent wind power unit (upwind type).
Rotational speed
of front wind rotor
Rated wind velocity
Output
Rotational speed
of rear wind rotor
Wind velocity
Cut-in wind velocity
Figure 7: Superior operation of the tandem wind rotors.
1.
Both wind rotors start to rotate in the counter directions at the low wind velocity,
namely the cut-in wind velocity.
The increase of the wind velocity makes the rotational speed of both wind
2.
rotors increase, while the rotational speed of the rear wind rotor is faster than
that of the front wind rotor because of its small size.
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