かえるまた結節網地の投影面積

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書誌事項

タイトル別名
  • Experimental studies on the projective area of the weaver's knot-netting.
  • カエルマタ ケッセツ アミジ ノ トウカゲメンセキ アミジ ノ トウカゲメンセ

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抄録

The purpose of this experiment is to obtain the experimental equation concerning the projective area of a Weaver's knot-netting as the basic research for the study of fluid dynamical coefficient at any attack angleθ, when the netting is set into a flow.<br> The netting samples used for the experiments are six kinds of netting of twine diameter d and leg length l. And, in addition to this, hanging angle ∅ is changed at six stages concerning one netting. The projective area is measured the same way as in the case of knotless twisted netting.<br> Results obtained are as follows:<br> (1) The projective area of a twine-portion on the (i×j) mesh netting sample, at the range of attack angle Θ∗<θ ?? 90° is derived in the following experimental equation.<br> S"θ=4ijd(l-3.03d)(0.16dl+0.51)sinδsindθ+6.08d2(2ij+i+j)<br> (2) The projective area of a twine-portion on the (i×j) mesh netting sample, at the range of attck angle Θ<θ ?? Θ∗ is derived in the following experimental equation.<br> S"Θ∗=3.68ijd(l-3.03d)/(0.16dl+0.51)sinδsindθ+6.08d2{(1.84ij+i-j-1)(θ/Θ∗)+2j+1}<br> (3) And concerning the range of attack angle 0° ?? θ ?? Θ, it is possible to represent in the following experimenta equation.<br> S"Θ=0.88[(2ij-j)l2sin2∅sinθ+2jd(l-3.03d)sinδ+6.08d2{(2j+1)+(i-1)(θ/Θ∗)}]<br> Where, <br> Θ∗: Attack angle when the adjacent knots touched each other on a projected plane.<br> S"θ: Projective area of the twine-portion of the Weaver's knot-netting at the range of attack angle Θ∗<θ ?? 90°.<br> S"Θ∗: Projective area of the twine-portion of the Weaver's knot-netting at the range of attack angle Θ<θ ?? Θ∗.<br> S"θ Projective area of twine-portion of the Weaver's knot-netting at the range of attack angle 0° ?? θ ?? Θ.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 50 (11), 1823-1828, 1984

    公益社団法人 日本水産学会

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