摘要
强度相同条件下,聚酰胺(PA)单丝网衣的水阻力比聚乙烯(PE)捻线网衣的要小,所以在普通PE网衣拖网中,可以对部分网衣结构设计替换高强度PA单丝网衣,以降低拖网阻力,达到节能降耗的目的。以虾拖网为实物拖网,按照田内模型试验准则,设计改进型PA网衣的模型拖网,通过水槽模型试验,对比研究改进型PA网衣和传统PE网衣的拖网渔具性能和节能效果。试验结果显示,在相同拖速条件下,水平扩张比(L/S)为0.40、0.50、0.60时,改进型模型拖网比对照模型拖网所受阻力分别可降低12.14%、8.11%、6.00%,网口高度分别可提高20.00%、22.09%、25.64%,网口扩张系数分别可提高28.57%、27.27%、30.00%,能耗系数分别可减少30.61%、29.32%、29.18%。研究表明,高强度PA单丝网衣拖网能起到降低渔具阻力、提高拖网性能的作用,可在渔业生产中推广应用。
With the same strength grades,polyamide （ PA） monofilament netting suffers less resistance thanpolyethylene （PE） twist wire netting in water,so some parts of PE twist wire trawl can be replaced by PAmonofilament material in order to reduce resistance and save energy.In this paper,a shrimp trawl was selected,based on which a PE twist wire model trawl and a structure -modified PA monofilament model trawl weredesigned following Tauti model experiment standard and their performance and energy saving property wereresearched and compared by flume experiment. The experiment results showed that under same testingconditions,the properties of modified PA monofilament model trawl were better than PE twist wire model trawl.Atthe same speed,when the L / S ratios of the two model trawls were 0.40,0.50 and 0.60,compared with the PEtwist wire model trawl,the resistance of modified PA monofilament model trawl decreased by 12.14%,8.11%,and6.00%,net opening height raised by 20. 00%,22. 09% and 25. 64%,vertical expand coefficient increased by28.57%,27.27% and 30%,and the energy consumption coefficient decreased by 18.34%,24.81% and 26.23%,respectively.The research shows that high-strength PA monofilament trawl could reduce resistance suffered byfishing gears and improve their performances,and can be extended and applied in fishery practices.
出处
《渔业现代化》
北大核心
2017年第1期51-58,共8页
Fishery Modernization
基金
浙江省自然科学基金项目(LY14C190005,Q14C190005)
浙江省海洋渔业装备技术研究重点试验室资助项目(MFET201406)
浙江省水产一流学科开放课题资助项目(20160021)
浙江省大学生科技创新活动计划(2016R411012)
关键词
PA单丝拖网模型
水槽对比试验
水阻力
垂直扩张
polyamide monofilament model trawl
flume experiment
resistance
vertical expand coefficient
