Page 237 - 《水产学报》2026年第01期

1 期 水 产 学 报 50 卷

Impact of single-strand diameter changes on the hydrodynamic
performance of three-strand ropes with equal strand diameters

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ZHANG Jintao , HUANG Liuyi , BI Chunwei , LAN Gonghai , YOU Xinxing ,
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LI Huanran , ZHANG Xuewen , ZHANG Jinhui , ZHANG Rongjun ,
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LÜ Haoyuan , FENG Weidong 2
(1. Fisheries College, Ocean University of China, Qingdao 266000, China;
2. CNFC Overseas Fishery Co., Ltd., Beijing 100032 China)
Abstract: This study takes a three-strand twisted rope with a nominal diameter of 40 mm (equal strand diameter) as the proto-
type. 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 experi-
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ments and numerical simulations within a Reynolds number range of 7.96×10 to 5.57×10 . The results revealed that: ① The
drag coefficients of all ropes exhibit minimal variation with increasing Reynolds number. ② The drag coefficient decreased
with reduced strand diameter, while the lateral force coefficient remained relatively stable. ③ Compared 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. ④ The high-velocity zones around the ropes and the areas of positive/neg-
ative 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 dia-
meter 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.
Key words: rope; hydrodynamic characteristics; flume experiment; numerical simulation
Corresponding author: HUANG Liuyi. E-mail: huangly@ouc.edu.cn

Funding projects: National Key Research and Development Program of China (2024YFD2400701); Qingdao Marine Science
and Technology Innovation Demonstration Project (23-1-3-hysf-2-hy)

https://www.china-fishery.cn 中国水产学会主办 sponsored by China Society of Fisheries
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