摘要
鲨鱼体表布满了盾鳞,盾鳞上的肋条状突起使鲨鱼皮成为一种沟槽型非光滑表面,沟槽结构具有极好的减阻效果,探究该结构的表面特征,将其应用于流体中工作的器械表面可达到很好的减阻节能效果。这种非光滑表面的横、纵截面轮廓曲线是决定其结构的主要因素,首先对这两条曲线进行曲线拟合,接着利用曲面重构原理对此沟槽结构进行数学建模,然后利用流体动力学分析软件对所重构的表面进行减阻效果的数值仿真,并从剪应力、应变、速度递减规律三个角度分析实验结果。分析结果显示:构建的新模型在以上三个角度的分析比较中均不同程度地显示出较好的减阻效果。研究结果可为沟槽减阻结构的设计提供理论依据,为研究和开发高效的仿生减阻表面提供参考。
Sharks have placoid scales on their skins. The riblets on placoid scales make shark’s skins become grooved non-smooth surfaces. The grooved structure can reduce drag effectively. To research the structure’s surface characteristics can achieve drag reduction objective when we apply it to the surface of the instrument that works in fluid. Lateral and vertical sections’ profile curves are major factors which determine the grooved structure. First, fit these two curves. The mathematical model about this grooved structure was established by surface reconstruction principle. Then, using fluid dynamics analysis software conducted a numerical simulation about the mathematical model’s drag reduction effect and analyzed experimental results according to shearing strength, strain and the rule of velocity decreasing. The analysis results show at different levels that new model has a better drag reduction effect based on these three aspects and provides theoretical basis for the design of drag reduction grooved structure and references for the research and development of efficient bionic surface.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2014年第7期1472-1476,共5页
Journal of System Simulation
基金
安徽省自然科学基金(1308085ME63)
关键词
仿生
减阻沟槽面
曲面重构
数值仿真
bionic
drag reduction grooved surface
surface reconstruction
numerical simulation
