袋網の流体抵抗

概要

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This study deals with fluid dynamic drag on conical bag nets which were set in a flume tank at a constant speed. Five types of conical bag net of varying sizes were made from six kinds of Weaver's knot netting. These were constructed with eight sheets of isosceles triangular panels of polyamide netting. Each of the conical bag nets was divided, according to its length, into four to eleven partitions (frustums of circular cone), in order to calculate the fluid dynamic drag. The angle of mesh opening and the angle of attack were determined from the meshes on frustum recorded on VTR by the computer graphics method. The measured drags were compared with the calculated values from the equation derived from the experiments on the plane Weaver's knot netting. The results obtained were as follows: 1) The calcultated values of fluid dynamic drag for the net type II, III, IV and V were similar with the measured ones. 2) In the case of the I type, the calculated drags did not agree with the measured drags; this was caused by interference with the legs.
日本水産學會の論文