Effects of drag coefficient of netting for dynamic similarity on model testing of trawl nets
Effects of drag coefficient of netting for dynamic similarity on model testing of trawl nets
复制标题
DOI：
10.1046/j.1444-2906.2001.00203.x
复制
发表时间：
2001-02-01
影响因子：
1.9
通讯作者：
Tokai, T
中科院分区：
文献类型：
--
作者：
Hu, FX;Matuda, K;Tokai, T
对于渔网的设计或改进，基于陶提定律或弗劳德定律的模型试验是很好的执行。然而，由于这些建模规则是基于网的阻力与水速度的平方的比例，因此从模型试验结果中得到的网的转换阻力与观测值相比相当大。在本研究中，考虑到网的阻力系数对实验中使用的基于绳径的雷诺数，修正了Tauti定律和Froude定律。根据修正的Tauti定律和Froude定律，制作了总长度为61 m的中拖网1/12、1/20和1/50三种不同比例的模型，并进行了全尺寸和模型实验。因此，三种比例模型换算成的全尺寸阻力值与实测值的差异在10%以内。这些修正的建模规则对拖网的模型试验都是有效的。
For design or improvement of fishing nets, a model test based on Tauti's law or Froude's law is well executed. However, because these modeling rules are based on the proportion of the drag of the net to the square of water velocity, the converted drag of the net from the result of model testing is considerably large compared with the observed value. In this study, Tauti's law and Froude's law were corrected considering the drag coefficient of the net to the Reynolds number based on the twine diameter used experimentally. Three different scale models: 1/12, 1/20 and 1/50 of a midwater trawl net of 61 m in total length were made according to the modified Tauti's law and Froude's law, and the full-scale and model experiment were carried out. Consequently, the difference between the converted drags of full-scale by three scale models and measured values was within 10%. Each of these modified modeling rules is effective for the model test of trawl nets.