摘要
为通过调节导流翼偏角优化网板的水动力学性能,利用水槽模型试验测得2种立式曲面缝翼式网板各3种导流翼偏角状态下的升力系数(CL)、阻力系数(CD)和升阻比(K)。结果表明:1)对单缝翼立式曲面网板,冲角为20°~35°时,随着导流翼偏角的增大,网板升力系数和阻力系数均呈下降趋势。该冲角范围内,导流翼偏角为35°的网板(D1)具有较佳的水动力学性能;2)对双缝翼立式曲面V型网板,冲角为25°~35°时,前导流翼偏角为20°、中导流翼偏角为25°的网板(S3)具有较佳的水动力学性能。根据试验结果,建议D1网板最佳工作冲角范围为15°~30°,此时CL〉1.2且K〉2.0;S3网板最佳工作冲角范围为20°~30°,此时CL〉0.8且K〉3.0。导流翼偏角增加时网板升力系数的临界冲角有增加的趋势,合理调节导流翼偏角可以达到优化网板水动力学性能的目的。
To study the effect of flow deflector angle on the hydrodynamic performance of otter board, a flume model experiment was conducted to measure the lift coefficient ( CL ) , drag coefficient ( CD ) and lift to drag ratio (K) of two flow deflector vertical cambered otter boards, each with three kinds of flow deflector angle. The experimental results show that : 1 ) For the single flow deflector vertical cambered otter board, when the angle of attack was between 20° - 35°, the CL and CD values showed a downtrend with increase of flow deflector angle. In this case the otter board D1 (flow deflector angle was 55°) showed better hydrodynamic performance. 2) For the double flow deflector vertical cambered otter board, when the angle of attack was between 25° - 35°, the otter board S3 ( the front flow deflector angle was 20° and the middle flow deflector angle was 25) showed better hydrodynamic performance. It is suggested that the best working scope of angle of attack of otter board D1 was between 15° - 30°, in that case, CL 〉 1.2 and K 〉2. 0; the best working scope of angle of attack of otter board $3 was between 20° - 30°, in that case, CL 〉 0. 8 and K 〉 3.0. The critical angle of at- tack of lift coefficient increased with increase of flow deflector angle. Properly regulating flow deflector angle could optimize the hydro- dynamic performance of otter board.
出处
《南方水产科学》
CAS
CSCD
北大核心
2015年第1期68-74,共7页
South China Fisheries Science
基金
国家高技术研究发展计划(863计划)项目(2012AA092301)
公益性行业(农业)科研专项经费项目(201203018)
南北极环境综合考察与评估专项(CHINARE2014-01-06)
中央级公益性科研院所基本科研业务费专项资金项目(2014T01)
关键词
拖网网板
导流翼
水动力学性能
模型试验
otter board
flow deflector
hydrodynamic characteristics
model test