Abstract
The authors conduct subsonic wind-tunnel experiments, in order to investigate the basic characteristics of an autorotating plate in uniform mainstream, which has a potential for new windmills and waterwheels with very simple structures in addition to mixers/diffusers. The present study focuses on both the effects of an aspect ratio AR and a tip-speed ratio Ω° upon the tumbling of a flat plate with a low depth-to-width ratio λ=0.02-0.08. The authors carry out measurements using a torquemeter together with the synchronised measurements of a plate's attack angle a for the analyses with a phase-averaging technique, in addition to measurements using a hot-wire anemometer and flow visualisations. As a result, we confirm that there are two torque modes T-modes I and II, as well as two flow-velocity modes V-modes I and II. This gives us more useful information for efficient renewable-energy resources.
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