拖网的网袖结构对其性能的影响

将拖网袖端由单燕尾改为双燕尾结构,改善了拖网上纲和网袖网线的受力,有利于网口的垂直扩张。经网模水池对此试验验证,双燕尾袖端结构对于提高拖网网口垂直扩张具有较为明显的效果,且根据试验观察,设计网在常规拖曳速度下,网形良好、稳定。理论分析与试验结果相符。

EFFECT OF THE CONSTRUCTION AT WING TIPS OF TRAWL ON ITS PERFORMANCE

By changing the wing tips into a double Swallow-tailed construction, the tensions occuring in the headline and twine at the wing tips have been improved. It is advantageous to raising the vertical mouth opening of the trawl. According to the results of model testing and the comparison between the testing trawl and commercial trawls, it can be seen that the double Swallow-tailed trawl has better performance in vertical mouth opening and better trawl geometry under normal towing speeds. The theoretical analysis meets the results of model testing.