摘要
为研究不同倾角和迎流冲角下小展弦比立式曲面网板的水动力性能，通过水槽模型实验计算网板的升力系数（CL）、阻力系数（CD）、浮力系数（CZ）和升阻比（K）。结果显示：（1）CL和K随冲角（α）的增加呈先升后降趋势，CD随冲角的增加呈上升趋势；（2）无倾角情况下，冲角为30°时，升力系数最大值CLmax=1．699，此时CD=1．140，K=1．490。冲角为15°时，升阻比最大值Kmax=2．421，此时CL=1．120，C。=0．463；（3）横倾角（β）在-10°～10°变化时，CLmax=1．816（α=25°，β=-10°），Kmax=3．405（α=10°，β=-10°）。横倾角为-5°和-10°时，网板具有一定浮力。冲角为10°～30°时，CZ平均值分别为0．16和0．25；（4）纵倾角（γ）在-10°～10°变化时，CLmax=1．823（α=25°或α=30°，γ=-10°），Kmax=2．729（α=5°，γ=-5°）。纵倾角为-5°、-10°和5°时，网板具有一定浮力。冲角为10°～30°时，CZ平均值分别为0．16、0．18和0．16。结果表明，该网板的最佳工作冲角范围为15°～30°，该冲角范围内网板CL〉1．1且K〉1．45。
For analyzing the hydrodynamic performance of low aspect ratio vertical cambered otter board at different angles of inclination and angle of attack,the lift coefficient（ CL ）, drag coefficient（ CD ） ,buoyancy coefficient（ CZ ）and lift to drag ratio （K）were calculated through the tank model experiment. The experimental results were as follows： （ 1 ） CL and K showed a trend of first increasing and then decreasing with the increase of angle of attack （ a）, CD reflected an upward trend with the increase of α ; （2） With no angle of inclination, when α = 30°, the max lift coefficient （ CLmax ） was 1. 699, in this case CD = 1. 540, K = 1. 490. When α = 15 °, the max lift to drag ratio （ Kmax ） was 2.421, in this case CL = 1. 120, CD = 0. 463 ; （ 3 ） When the heeling angle（β） changed between - 10° - 50°, CLmax = 1. 816（ α = 25° ,β = -10°） ,Kmax = 3. 405 （α = 10°,β = -10°）. The otter board had a certain buoyancy when β was -5° and -10°,the average buoyancy coefficient was 0.16 and 0.25 respectively, when α was between 10° -30°;（4）When the trim angle（γ） changed between - 10° - 10°, CLmax = 1. 823 （α = 25° or α = 30°,γ = - 10°） , Kmax = 2. 729 （ α = 5γ,γ = - 5°）. The otter board had a certain buoyancy when γ was - 5°, - 10° and 5°, the average buoyancy coefficient was 0.16,0.18 and 0.16 respectively, when α was between 10° -30°. It is suggested that the best working scope of angle of attack was between 15° - 30° ,in which case CL 〉 1.1 and K 〉 1.45. Finally compared the hydrodynamic performance of different types of otter board, we provided a reference basis for the rational use and further development of the new types of otter board.
出处
《水产学报》
CAS
CSCD
北大核心
2013年第11期1742-1749,共8页
Journal of Fisheries of China
基金
国家"八六三"高技术研究发展计划(2012AA092301)
公益性行业(农业)科研专项(201203018)
国家科技支撑计划(2013BAD13B03)
关键词
立式曲面网板
水动力性能
模型实验
vertical cambered otter board
hydrodynamic characteristics
model test
