摘要
【目的】研究单股直径变化对等股径三股绳索水动力性能的影响。【方法】以公称直径40 mm等股径三股捻绳为原型,基于三股绳索横截面数学方程构建原型绳索(编号40-40)和4种变股径绳索模型。4种变股径绳索是以公称直径48、44、36和32 mm三股绳索中的单股替代原型绳索单股构建的模型,编号分别为40-48、40-44、40-36和40-32。通过3D打印制作绳索实物模型,利用水槽试验与数值模拟方法研究雷诺数7.96×10^(3)~5.57×10^(4)区间,单股直径变化对绳索水动力系数、流场分布特征的影响。【结果】①各绳索阻力系数随着雷诺数的增大变化较小。②绳索阻力系数随单股直径的减小而减小,而侧向力系数变化不大;40-32、40-36的阻力系数平均值比40-40分别小7.06%、4.49%,40-44、40-48的阻力系数平均值比40-40分别大2.22%、5.51%。③绳索周围高速区大小与绳索表面正、负压区的面积随单股直径的减小而减小,且绳索后方湍流随之减弱,导致绳索压差阻力降低,阻力系数减小。【结论】单股直径减小能够有效降低绳索阻力,减弱绳索后方湍流。研究结果可为渔具水动力学研究、绳索等渔具材料的创新设计提供参考。
This study takes a three-strand twisted rope with a nominal diameter of 40 mm(equal strand diameter)as the prototype.Based on the mathematical equations of the cross-sectional geometry of three-strand ropes,a prototype rope(labeled 40-40)and four variant rope models with modified strand diameters were constructed.The four variant ropes were created by replacing the original strands of the prototype with strands from three-strand ropes of nominal diameters 48,44,36,and 32 mm,labeled as 40-48,40-44,40-36,and 40-32,respectively.Physical rope models were fabricated via 3D printing,and the effects of strand diameter variations on hydrodynamic coefficients and flow field characteristics were investigated through flume experiments and numerical simulations within a Reynolds number range of 7.96×10^(3)to 5.57×10^(4).The results revealed that:①The drag coefficients of all ropes exhibit minimal variation with increasing Reynolds number.②The drag coefficient decreased with reduced strand diameter,while the lateral force coefficient remained relatively stable.③Compared to the prototype(40-40),the average drag coefficients of 40-32 and 40-36 decreased by 7.06%and 4.49%,respectively,whereas those of 40-44 and 40-48 increased by 2.22%and 5.51%,respectively.④The high-velocity zones around the ropes and the areas of positive/negative pressure on the rope surfaces diminished as strand diameter decreased,accompanied by weakened downstream turbulence,leading to reduced pressure difference resistance and lower drag coefficients.This study demonstrates that reducing strand diameter effectively decreases rope resistance and mitigates downstream turbulence.The findings provide valuable insights for hydrodynamic research on fishing gear and innovative design of rope-based materials in fisheries engineering.
作者
张锦涛
黄六一
毕春伟
蓝恭海
尤鑫星
李焕然
张学文
张锦辉
张荣军
吕昊元
冯卫东
ZHANG Jintao;HUANG Liuyi;BI Chunwei;LAN Gonghai;YOU Xinxing;LI Huanran;ZHANG Xuewen;ZHANG Jinhui;ZHANG Rongjun;LÜHaoyuan;FENG Weidong(Fisheries College,Ocean University of China,Qingdao 266000,China;CNFC Overseas Fishery Co.,Ltd.,Beijing 100032 China)
出处
《水产学报》
北大核心
2026年第1期223-234,共12页
Journal of Fisheries of China
基金
国家重点研发计划(2024YFD2400701)
青岛市海洋科技创新示范工程项目(23-1-3-hysf-2-hy)。
关键词
绳索
水动力特性
水槽试验
数值模拟
rope
hydrodynamic characteristics
flume experiment
numerical simulation
