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Research on the drag reduction property of puffer (Takifugu flavidus) spinal nonsmooth structure surface.
Microscopy Research and Technique ( IF 2.5 ) Pub Date : 2020-03-06 , DOI: 10.1002/jemt.23470
Honggen Zhou 1, 2 , Chenqing Liu 1 , Guizhong Tian 1, 2 , Xiaoming Feng 1, 2 , Changfeng Jia 1
Affiliation  

Puffers show good drag reduction performance during migration. It is worth noting that spines which are different from ordinary fish scales are densely distributed on the puffer skin. Here, the special morphological structure of puffer spines was observed using microscopy techniques, accurate contour models were established based on image processing techniques and curve fitting, then feature sizes were obtained. Based on the results, the nonsmooth surface was established by orthogonal test to simulate the flow field. In addition, the influence of spinal structure on boundary layer flow field and the drag reduction property of nonsmooth surface were further analyzed. The nonsmooth surface formed by spinal structure elements can effectively reduce the wall shear stress and Reynolds stress, and there was a special “climbing vortex” phenomenon, so as to reduce the surface viscous friction resistance and achieve drag reduction. Compared with the smooth surface, the drag reduction rate of the nonsmooth surface was 12.94% when the inflow velocity was 5 m/s, which revealed and verified the drag reduction performance of the spines of puffer skin. The results lay a foundation for further research and optimization of drag reduction ability of nonsmooth surface of bionic spines.

中文翻译:

河豚(Takifugu flavidus)脊柱非光滑结构表面的减阻性能研究。

膨化机在迁移过程中显示出良好的减阻性能。值得注意的是,河豚皮上密集分布着不同于普通鱼鳞的刺。在这里,使用显微镜技术观察河豚刺的特殊形态结构,基于图像处理技术和曲线拟合建立精确的轮廓模型,然后获得特征尺寸。根据结果​​,通过正交试验建立了非光滑表面,以模拟流场。此外,进一步分析了脊柱结构对边界层流场的影响以及非光滑表面的减阻特性。脊柱结构元素形成的非光滑表面可以有效地减少壁面剪应力和雷诺应力,并且存在特殊的“爬升涡”现象,从而降低表面粘性摩擦阻力并实现减阻。与光滑表面相比,当流速为5 m / s时,非光滑表面的减阻率为12.94%,这揭示并验证了河豚皮刺的减阻性能。研究结果为进一步研究和优化仿生刺非光滑表面减阻能力奠定了基础。
更新日期:2020-03-06
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