An Analysis of Drag Coefficient of Plane Nets Made from Twisted Knotless Nettings and Reynolds Number.

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  • 二子撚り式無結節網地の抗力係数とレイノルズ数
  • ニコヨリシキ ム ケッセツ アミジ ノ コウリョク ケイスウ ト レイノルズ

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Abstract

This study investigates the relationship between drag coefficient of plane nets and Reynolds number. Thirteen kinds of twisted knotless nettings were used for the experiment, out of which seven kinds used the same twine diameter with different mesh sizes, and the other six used the same mesh size with different twine diameters.<br> Each plane net was fixed on a U-shaped frame to keep the meshes square. The nets were set in a flume tank normal to the flow direction while monitoring the mean velocity, and the drag was measured using a three-component tension meter and the results stored in a computer for analysis.<br> The induced velocity was used to calculate C´D(90), R´e(d) was based on the induced velocity, and the twine diameter was used as a representative length.<br> The drag coefficient (C´D(90)) can be expressed by the following equation;<br> C´D(90)=20.33/R´e(d)+0.33<br> The results obtained agreed well with the experimental values.

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