縦横比の異なる平板の揚抗力特性に及ぼす底面の影響

概要

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The hydrodynamic characteristics of flat plates in free stream and near the bottom were studied. Four types of flat plate with different aspect ratios (λ) were tested in a circulating water tank. In the case of λ=0.5, which is similar to that of the otter board used in traditional coastal trawlers, the maximum lift coefficient at the angle of stall (αs) in free stream and near the bottom was 1.25 at αs=40°C and 0.90 at αs=25°C, respectively. This indicates that the maximum lift coefficient near the bottom decreased about 30% compared with that in free stream. However, at λ=2.0, the maximum lift coefficient near the bottom was almost the same as that in free stream. Therefore, it is concluded that the higher the aspect ratio of the plates, the smaller the effect of the bottom on the maximum lift coefficient.
日本水産學會の論文