関西造船協会誌
Online ISSN : 2433-104X
Print ISSN : 0389-9101
会議情報
舵と船尾底との隙間効果に関する基礎的研究
仲渡 道夫工藤 君明加藤 隆一
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会議録・要旨集 フリー

p. 51-58

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The results of model basin experiments on rectangular flat plates near temporary wall are presented. The experiments simulated the condition of a rudder operating near stern-bottom with finite gaps. Tests were carried out on two flat plates having aspect ratios of 1.0 and 1.35. The open water tests were also carried out for each and/or double aspect ratio flat plate which is equal to the limiting case of infinity and/or zero gap-to-span ratio. Results are presented for each rectangular flat plate as normal force coefficients. The leading edge was sharpened in every case. In case of aspect ratio 1.0 the results are compared with Winter's experiments. Both agreed very we11, so that we are able to be assured of our measuring system. When the gap ratio becomes less than about 0.1, the normal force coefficient tends to be equal to that of double aspect ratio flat plate. However, the effect of increasing aspect ratio seems to advance the stall at the leading edge. The theoretical calculations were also made and compared with the experimental results. The linear lifting surface theory gives lower normal force coefficients but predicts higher effect of gap than the experiments. The strip method for the nonlinear lifting surface was applied to this problem. Assuming that the free vortex shedding angle Θ is equal to the angle of attack α, this method compares well with the experimental results.

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© 1980 公益社団法人日本船舶海洋工学会
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