410 流れの中で自励回転する低アスペクト比平板に関する実験研究(新エネルギー(1))

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The authors conduct subsonic wind-tunnel experiments, in order to investigate the basic characteristics of an autorotating flat plate in uniform mainstream, which has a potential for windmills and waterwheels with very simple structures. The present study focuses on the effect of an aspect ratio AR upon the tumbling of a flat plate with a low depth-to-width ratio λ=0.025-0.083. The authors carry out both flow visualisations and velocity measurements using a hot-wire anemometer, together with the synchronised measurements of a plate's attack angle α by the analysis by a phase-averaging technique. As a result, there are two flow modes I and II. In addition, the authors reveal the basic features of each mode, on the basis of instantaneous velocity profiles at each α, flow visualisations, wake deviations and momentum deficits. These suggest more efficient renewable-energy resources.
2010-06-26