A Novel Vertical-Axis Wind Turbine for Distributed & Utility ...
Document source : www.ontario-sea.org
cross-section of 2.3m × 2.1m and affords a change in the wind speed from 0 to
16.7m/s continuously within low turbulence intensity levels. The wind speed in the
wind tunnel is automatically computed by using a digital micro-manometer with
density corrections by the measurement of room temperature and humidity.
Performance Prediction and Measurement
The PMG-type generator is connected to a girth gear via a pinion gear to
measure the grid-tie performance by applying variable loads to the system. The
rotational speed of the rotor and the electric power were simultaneously measured
and stored in a data logger via RS-232 communication.
The performance of the KR 1kW proto-type turbine was predicted at the design
stage by considering the effects of the blade number and the aspect ratio (H/D) on
the power coefficient (C
p
). Increasing the number of blades results in an asymptotic
increase in the power coefficient, and the aspect ratio H/D near 0.5 gives the maxima
of the power coefficient for the case of NZ=12, as shown in Fig. 8.
Fig. 6 Schematic view of open-type wind tunnel and test turbine
Fig. 7 Apparatus setup for performance measurement
While the KR 1kW proto-type turbine which has 7 blades and the aspect ratio of
0.52 is supposed to have a maximum power coefficient of 0.52, the measured
performance in the wind tunnel test results in 0.47 as a maximum as shown in Fig.
9(a). This discrepancy is considered to come from the one-sided, compliant blade
Summary :
7 Apparatus setup for performance measurement While the KR 1kW proto-type turbine which has 7 blades and the aspect ratio of 0.52 is supposed to have a maximum power coefficient of 0.52, the measured performance in the wind tunnel test results in 0.47 as a maximum as shown in Fig.
Tags :
power,performance,wind,fig,coefficient,turbine,measurement,speed,aspect,ratio,tunnel,test,blades