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Experimental investigation of aerodynamic drag and flow characteristics of circular cylinder with microfiber coating
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2021-07-12 , DOI: 10.1016/j.expthermflusci.2021.110478
Mitsugu Hasegawa 1 , Hirotaka Sakaue 1
Affiliation  

A microfiber coating with a hair-like structure is studied as a passive drag reduction device applied on a cylinder. The coating is applied in the flow-separated region of the cylinder to determine its effect on the wake. Flow around a cylinder is studied under the subcritical regime with a Reynolds number of 6.1 × 104 based on the cylinder diameter. The length of the microfiber is 8% of the cylinder diameter. After application of the microfiber coating, the dominant wake-frequency in the flow associated with the Karman-Vortex formation rose and moved further downstream of the cylinder. The frequency increase and the location of the dominant wake-frequency, which corresponds to the vortex’s formation length, are dependent on the coverage of the coating on the cylinder. These changes in the flow features result in drag reduction. The amount of drag reduction is dependent on the coverage of the microfiber coating in the flow-separated region. A maximum drag reduction of 16% is achieved.



中文翻译:

微纤维涂层圆柱体气动阻力和流动特性的实验研究

研究了具有毛发状结构的超细纤维涂层作为应用于圆柱体的被动减阻装置。涂层应用于圆柱体的流动分离区域,以确定其对尾流的影响。在雷诺数为 6.1 × 10 4的亚临界状态下研究圆柱周围的流动根据气缸直径。超细纤维的长度为圆柱直径的 8%。应用微纤维涂层后,与卡门涡流形成相关的流动中的主要尾流频率上升并进一步移动到圆柱体的下游。频率增加和主要尾流频率的位置(对应于涡流的形成长度)取决于圆柱体上涂层的覆盖范围。流动特征的这些变化导致阻力减少。减阻量取决于微纤维涂层在流动分离区域的覆盖范围。实现了 16% 的最大减阻。

更新日期:2021-07-18
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