Intelligent wind power unit with tandem wind rotors - Wind Power Generation and Wind Turbine Design - page 350

accumulated from start to stop of the truck. The data corresponding to the
acceleration and deceleration of the truck were excluded for the evaluations of the
experimental data, in order to get the results at the steady-state fl ow conditions.

5.3 Performances of the tandem wind rotors

The effects of the rear blade setting angle b R on the performances are shown
in Fig. 27, in keeping the front blade setting angle b F = 20° and the bulb load

Acceleration

Steady State Deceleration

30 600

N F

22.5 300

V

15 0

7.5 -300

N R

0 -600

0 20 40 60 80 100

Measurement time Sec

Figure 26: Accumulated rotational speeds while driving the truck.

b R deg. 10 20 30

1000

N F , P

N F

N R

500

0

N R

-500

-1000

900

b F = 20deg.
P bulb = 900W

600

300

0

0 4 8 12 16 20

V m/s

Figure 27: Effect of the blade setting on the performance.