Hydrodynamic characteristics of knotless nylon netting normal to free stream and effect of inclination
Hydrodynamic characteristics of knotless nylon netting normal to free stream and effect of inclination
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DOI：
10.1016/j.oceaneng.2015.09.043
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发表时间：
2015-12-01
影响因子：
5
通讯作者：
Qu, Xiaoyu
中科院分区：
文献类型：
--
作者：
Zhou, Cheng;Xu, Liuxiong;Qu, Xiaoyu
尼龙纤维是围网钓具网片的主要材料。无结尼龙编织的网被称为“超十字”，比传统的扭曲网具有更高的强度和耐磨性能。本研究探讨不同密实度比之无结尼龙网布在垂直流、平行流及倾斜流方向之水动力特性。法向阻力系数被认为是依赖于雷诺数（Re）和实度比的合作支配。净稠度对法向阻力系数有正的影响，而对平行于水流方向的网片阻力系数的依赖性则相反。实度对斜网阻力系数的影响具有双重性，即在上攻角下为正相关，在下攻角下为负相关。不同攻角下的阻力系数可以用法向阻力系数和平行方向阻力系数表示。(c)2015爱思唯尔有限公司版权所有。
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. (c) 2015 Elsevier Ltd. All rights reserved.