| 尼龙有结节菱形网片的水动力系数 |
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| 引用本文： | 陈鹿,周应祺,曹道梅,邹晓荣,李玉伟,黄洪亮,刘健.尼龙有结节菱形网片的水动力系数[J].上海海洋大学学报,2015,24(6):943-951. |
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| 作者姓名： | 陈鹿 周应祺 曹道梅 邹晓荣 李玉伟 黄洪亮 刘健 |
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| 作者单位： | 上海海洋大学 海洋科学学院,上海海洋大学 海洋科学学院,上海海洋大学 海洋科学学院 |
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| 基金项目： | 上海高校青年教师培养资助计划（B-5409-13-0010）；上海海洋大学科技发展专项基金资助（A2-0209-15-200002）；浙江省海洋渔业装备技术研究重点实验室资助（MFET201409）；上海高校青年教师培养资助计划（A1-2035-14-0010-14）；上海海洋大学博士科研启动基金（A-0209-13-0105418）；国家863计划，竹筴鱼资源高效利用关键技术研究(2012AA092301) |
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| 摘 要： | 为了提高网片水动力系数的计算精度,本文通过动水槽实验对5种网片的水动力学性能进行测试。测试的参数包括水流对网片的冲角、流速、网片的水平缩结系数ET等,网片的水动力学升力系数CL、阻力系数Cd、升阻系数比K等。结果表明:(1)当雷诺数Re小于1 500,冲角小于45°时,阻力系数呈现先增后减的趋势;而冲角大于45°时,阻力系数呈减小的趋势。雷诺数Re大于2 800时,阻力系数基本趋于稳定。(2)升阻系数比K最大值出现在20°附近;在30°~90°之间,K值呈减小趋势;(3)升阻力系数随d/a的增大先增大后减小;(4)升阻力系数随线面积系数的增大而减小;(5)通过多元非线性拟合得出升阻力系数的经验公式,拟合度较好。本实验经验公式为拖网阻力的计算提供了依据。
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| 关 键 词： | 有结节菱形网片，水槽实验，水动力系数，雷诺数，冲角 |
| 收稿时间： | 2015/3/19 0:00:00 |
| 修稿时间： | 2015/5/21 0:00:00 |
The hydrodynamic coefficients of the knotted nylon netting with diamond mesh |
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| CHEN Lu,ZHOU Yingqi,CAO Daomei,LI Yuwei,ZOU Xiaorong,HUANG Hongliang and LIU Jian.The hydrodynamic coefficients of the knotted nylon netting with diamond mesh[J].Journal of Shanghai Ocean University,2015,24(6):943-951. |
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| Authors: | CHEN Lu ZHOU Yingqi CAO Daomei LI Yuwei ZOU Xiaorong HUANG Hongliang and LIU Jian |
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| Institution: | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China,College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai Ocean University, Shanghai 201306, China,College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai Ocean University, Shanghai 201306, China,College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai Ocean University, Shanghai 201306, China,College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai Ocean University, Shanghai 201306, China,East China Sea Fisheries Research Institute, CAFS, Key and Open Laboratory of Marine and Estuarine Fisheries, Ministry of Agriculture, Shanghai 200090, China and East China Sea Fisheries Research Institute, CAFS, Key and Open Laboratory of Marine and Estuarine Fisheries, Ministry of Agriculture, Shanghai 200090, China |
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| Abstract: | In order to improve the mathematical model of Chinese Trachurus japonicus trawls and to optimize network design, the hydrodynamic coefficients of the knotted nylon netting with diamond mesh were measured in the flume tank. The hydrodynamic characteristics represented by the drag coefficient (Cd), lift coefficients (CL) and their ratio K under varied parameters, i.e. twine diameter, current speed and attack angle, hanging ratio etc. in 5 kinds of netting were studied. The results show that:(1) when Reynolds number(Re) is less than 1500 and the attack angle is less than 45°, the drag coefficient showed a decreasing trend after increasing;And when the attack angle is greater than 45°, drag coefficient showed a decreasing trend. When Reynolds number (Re) is greater than 2800, the drag coefficient reached basically stable states. (2)The maximum values of the ratio of lift coefficient to drag coefficient (K) occurred at about 20 degrees; K values decreased over 30 degrees;(3) The hydrodynamic coefficients firstly increased as d/a increased and then decreased. (4)The hydrodynamic coefficients decreased as the solidity ratio increased.(5)Based on the empirical formula of drag and lift coefficients by multivariate nonlinear regression,the fitness is good.The empirical formula can be used to calculate the resistance of the trawl. |
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| Keywords: | nodular diamond netting flume tank test hydrodynamic coefficients Reynolds number attack angle |
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