Hydrodynamic characteristics of knotless nylon netting normal to free stream and effect of inclination

作者：Zhou, Cheng; Xu, Liuxiong^*; Hu, Fuxiang; Qu, Xiaoyu

来源：Ocean Engineering, 2015, 110: 89-97.

DOI：10.1016/j.oceaneng.2015.09.043

• Ultra cross netting
• Solidity ratio
• Drag coefficient
• Lift coefficient

Nylon fiber is the dominant material for net panels in purse seine tackle. Nets of a knotless nylon weave called "Ultra Cross" benefit from higher strength and attrition-resistant properties over conventional twisted netting. This study reports the hydrodynamic characteristics of knotless nylon netting with various solidity ratio in their normal, parallel, and angle of incline to free stream. Normal drag coefficient is considered to be dependent on the cooperative domination of Reynolds number (Re) and solidity ratio. Net solidity has a positive effect on the normal coefficient, while it is contrary in the dependence of the drag coefficient of net panel parallel to flow on the solidity. A dual effect of solidity on drag coefficient for inclined nets was observed, which is described as a positive correlation in upper attack angle and a negative correlation in lower angle of attack. The drag coefficients at different angles of attack can be expressed by incorporating both normal coefficient and coefficient in parallel orientation.

• 出版日期2015-12-1
• 单位上海海洋大学