鱗動進行波による推力発生の可能性について

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タイトル別名
  • On the thrusting-occurrence-possibility by the movement of the scale plates
  • リンドウ シンコウハ ニヨル スイリョク ハッセイ ノ カノウセイ ニツイテ

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抄録

Wiggle-motion of a fish causes an opening to be made between the scales in the direction ofbody-breadth.Irrespective of the small breadth of the opening, if the scale-rising on the body-surface is slowon the convex-side of the wiggle, returning quickly to the former state on the concave-side of it,the occurrence of thrusting is assumed.This thrusting is supposed to decrease the swimming-resistance of fish in cooperation withthe effect of the progressive-wave of the scale plates, running from forward to backward.In order to ascertain this, a two-dimensional large-fish-scale model was made, and the following were investigated by experiments,existence of thrusting-occurrence, the scope andvariations, e.t.c..The results are as follows：－(1) It was observed that the production of thrusting which is followed by a running ofcurrent, is to be brought forth by the movement of scale plates which are opening slowlyand closing quickly.It was confirmed that the shorter is the period of the movement, the faster is thecurrent running along the scale plates; the maximum speed of the current being 14.5 cm/sec, the maximum of the dynamical pressure of the current being 7199.2 dyn/cm^<2> (7.3 gr.wt/cm^<2>).(2) The water in the water-way began to circulate about 3 minutes after it started to movethe scale plates, and about 10 minutes had passed before the current was settled.

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