TY - GEN
T1 - Effects of aspect ratio on the hydrodynamic performance of circular cambered otter board
AU - Huang, Liuyi
AU - Li, Yuyan
AU - Xu, Jiqiang
AU - Xu, Qingchang
AU - Zhao, Fenfang
AU - Wang, Xinxin
AU - Tang, Yanli
AU - Jia, Mingxiu
AU - Liang, Zhenlin
N1 - Publisher Copyright:
Copyright © 2018 ASME.
PY - 2018
Y1 - 2018
N2 - An otter board is an important device that provides a desired horizontal opening of a trawl net. A high lift coefficient or lift-to-drag ratio is required for an otter board to maintain fishing efficiency. In the present work, the hydrodynamic performance of a circular cambered otter board was studied by numerical simulation, including the effects of aspect ratios (AR), and flow distribution around the otter board. Model tests were conducted in the flume tank as well as a comparison to the numerical results. It showed that simulation results exhibited very good agreement with experiment results. Results demonstrated that the model otter board had a critical angle of attack (AOA) of 50° (when the stall appeared). The maximum lift coefficient and lift-to-drag ratio of the model otter board were 2.421 and 3.719, respectively. However, the maximum values of the full-scale otter board increased first and then decreased with an increasing AR. And the full-scale otter board had a better performance when AR=2.489, it can enhance the lift coefficient by 17.4% compared with the initial otter board (AR=1.25). In addition, the flow distribution around the otter board showed that the flow was smooth at small AOAs, when it attacked at large AOA (exceeded 55°), flow separation and eddies were appeared at the lee-side of the otter board.
AB - An otter board is an important device that provides a desired horizontal opening of a trawl net. A high lift coefficient or lift-to-drag ratio is required for an otter board to maintain fishing efficiency. In the present work, the hydrodynamic performance of a circular cambered otter board was studied by numerical simulation, including the effects of aspect ratios (AR), and flow distribution around the otter board. Model tests were conducted in the flume tank as well as a comparison to the numerical results. It showed that simulation results exhibited very good agreement with experiment results. Results demonstrated that the model otter board had a critical angle of attack (AOA) of 50° (when the stall appeared). The maximum lift coefficient and lift-to-drag ratio of the model otter board were 2.421 and 3.719, respectively. However, the maximum values of the full-scale otter board increased first and then decreased with an increasing AR. And the full-scale otter board had a better performance when AR=2.489, it can enhance the lift coefficient by 17.4% compared with the initial otter board (AR=1.25). In addition, the flow distribution around the otter board showed that the flow was smooth at small AOAs, when it attacked at large AOA (exceeded 55°), flow separation and eddies were appeared at the lee-side of the otter board.
KW - Aspect ratio
KW - Circular cambered otter board
KW - Flume tank experiment
KW - Hydrodynamic performance
KW - Numerical simulation
UR - https://www.scopus.com/pages/publications/85055500145
U2 - 10.1115/OMAE2018-78450
DO - 10.1115/OMAE2018-78450
M3 - 会议稿件
AN - SCOPUS:85055500145
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - Offshore Technology
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018
Y2 - 17 June 2018 through 22 June 2018
ER -