1. Author: Aldo Cattano date:10/01/2014 VAWT Field test
Test results Page 1/3 Vertical axis turbine
Vertical Axis turbine
Test results.
Two different tests were performed:
1. first one of rotor alone
2. second one of rotor with a conveyor in front .
Both tests were performed using the turbine connected at the top of a truck as wind speed stable
source . the rotor is connected to a torque-meter and a brake system and in parallel a anemometer
and a rpm counter.
Fig. 1-2: first test without conveyor
Fig. 3-4: second test with conveyor located in front of rotor.
The conveyor is not of same shape of design, but it was not possible to attach one like that.

2. Author: Aldo Cattano date:10/01/2014 VAWT Field test
Test results Page 2/3 Vertical axis turbine
Find below the diagram of power in the 2 tests:
50
150
250
350
450
550
650
750
850
950
1050
1150
1250
1350
5 6 7 8 9 10 11 12 13 14 15 16 17 18
wind speed m/s
p
o
w
e
r
W
Fig. 5: power production versus wind speed. The increase in power is of 50% over 13 m/s and 30%
below.
With these results we can find the power production with real conveyor system that is 3 times larger
.
Considering the actual shape the rotor had a too low torque , so it would be necessary to increase
the diameter from 1 mt till 1,5 mt and length can go from 5 mt till 7 mt.
In this situation the power production will increase till our goal.

3. Author: Aldo Cattano date:10/01/2014 VAWT Field test
Test results Page 3/3 Vertical axis turbine
To measure the power increase we take in consideration the 10 m/s wind speed power.
Actual measured power with out conveyor: 275 watt
Actual measured power with conveyor: 375 Watt
Correct increase due to difference between drag coefficient ( 1.4-0.4 ) x 1.4=1.4
Theoretical power with designed conveyor: 375 x 2= 750 Watt
In this case the wind will blow 1.4 times faster and rpm will also be same increase.
Theoretical power with designed conveyor and increased lenght: 750 x 1.4( 7/5)= 1050 Watt
The increase is proportional to the length increase
Theoretical with designed conveyor and increased lenght: and increased diameter :
1050 x 2.25 ((1.5/1)2
)= 2360 Watt
The increase is quadratic with the area increase.
The power coefficient measured at 10 m/s is 0.125 and the practical achievable is 0, 25, so we can
Reach the target with conveyor and dimension increase.