垂直轴流风机扩散放大器性能的实验研究
The performance of a vertical axis wind turbine with and without a diffuser was studiedusing direct force measurement technique applied to a scaled model of the rotor in awater tunnel. The experiment was conducted at different tip-speed ratios. The maximumpower coefficient for the turbine was found to be equal to 0.35 for the rotor with diffuserand to 0.26 for the rotor without diffuser. Therefore, the maximum power coefficient wasincreased by 35% when the diffuser was used in the configuration.In the second part of this work, the flow patterns downstream of the turbine werestudied by the particle image velocimetry (PIV) technique. Six different tip-speed ratioswere considered for each configuration (with and without a diffuser). The vorticity andthe streamline plots provide insight into the flow physics in each configuration. Inaddition, the swept area of a full-scale rotor was calculated for both a diffuser-augmentedand a bare turbine for a range of power outputs.