南极磷虾拖网的试验研究

Experiment and Research of Krill Trawl Net

本文以我国首次南极磷虾探捕所使用的两顶大型变水层磷虾拖网为实物网,通过网具模型试验,测试网具的阻力与网口高度,分析其水动力性能,结果表明:网口部位六角形结构的2号网的垂直扩张性能和过滤同等体积的能量消耗均优于网口部位棱形网目结构的1号网;在拖速1.54m/s,1号网的能耗系数比2号网平均高26%。而网口垂直扩张系数低1.1%。南极磷虾拖网的阻力可用公式:R=0.25(d/a)LCV1.49估算。

This paper describes the experiment of net models by the two large size krill middle trawling nets used in the first exploitation of krill fishing in the Antarctic waters as actual net. The experiment is aimed to test the resistance of net and height of net mouth and analyze the performance of hydrodynamic force. The results is indicated that the vertical spread of No.2 net with hexagon mesh at net mouth part and power consumption at filtering equal volume excel the No.1 net with prismatic mesh at net mouth part;that at trawling speed of 1.54m/s the power consumption coefficient is 26% more than that of No.2 net and the vertical spread coefficient of No.1 net is 1.1% lower than that of No.2. The resistance of krill trawling net can be calculated by the formula of R=0.25（d/a）LCV1.49 .