欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
为提高南极磷虾单船拖网低拖速作业时的网具扩张性能，针对一种立式曲面中空式拖网网板，利用水槽模型试验测得不同迎流冲角状态下的升力系数（C_L）、阻力系数（C_D）和升阻比（K）。结果表明，C_L和K值随冲角的增大呈先升后降趋势，C_D随冲角的增大呈上升趋势；升力系数最大值C_Lmax：1．436（冲角 α=30°），此时CD=0．649，K=2．213，升阻比最大值K_max=4．67l（ α=10°），此时CI=0．981，CD=0．210；工作冲角范围为10°～30°时，南极磷虾拖网网板升力系数C_L〉0．98且升阻比K〉2．21。比较不同类型网板的水动力性能，南极磷虾拖网网板具有阻力系数较低、升阻比较高的优点，可为进一步优化南极磷虾拖网网板性能提供参考依据。
英文摘要：
For improving the expansion performance of trawl net in low trawling speed and enhancing the Antarctic krill trawl productivity, a high aspect ratio otter board with hollow structure was developed. A flume model experiment was conducted to measure the lift coefficient （ C_L ）, drag coefficient （ C_D ） and lift to drag ratio （K） in different angle of attack （ α）. The experimental results are as follows：The CI, and K value show a trend of increasing at the beginning and then decreasing with the increase of angle of attack, CD value reflects an upward trend with the increase of angle of attack ; when α = 30°, the max lift coefficient （ CL_max ） is 1. 436, in this case C_D =0. 649, K =2. 213 ; When α = 10°, the max lift to drag ratio （Kmax） is 4. 671, in this case CL =0. 981, CD =0. 210. Suggest the best working scope of angle of attack is between 10° - 30°, in which case, C_L 〉0.98 and K 〉2.21. Through comparative analysis of the hydrodynamic performance of different types of otter boards, the Antarctic krill trawl otter board has advantages of lower drag coefficient and higher lift to drag ratio, which can provide a reference basis for further optimization of the Antarctic krill trawl otter board.
同期刊论文项目
同项目期刊论文
期刊信息
位置：