方案详情文
The performance of a vertical axis wind turbine with and without a diffuser was studied
using direct force measurement technique applied to a scaled model of the rotor in a
water tunnel. The experiment was conducted at different tip-speed ratios. The maximum
power coefficient for the turbine was found to be equal to 0.35 for the rotor with diffuser
and to 0.26 for the rotor without diffuser. Therefore, the maximum power coefficient was
increased by 35% when the diffuser was used in the configuration.
In the second part of this work, the flow patterns downstream of the turbine were
studied by the particle image velocimetry (PIV) technique. Six different tip-speed ratios
were considered for each configuration (with and without a diffuser). The vorticity and
the streamline plots provide insight into the flow physics in each configuration. In
addition, the swept area of a full-scale rotor was calculated for both a diffuser-augmented
and a bare turbine for a range of power outputs.
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