Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA.
Sci Rep. 2022 Sep 2;12(1):15022. doi: 10.1038/s41598-022-19302-5.
Drag reduction for a bluff body is imperative in a time of increasing awareness of the environmental impact and sustainability of air travel. Microfiber coating has demonstrated its ability to reduce drag on a bluff body. This was done by applying strips of the coating to a cylinder. To widen the application range of the microfiber coating, a fully microfiber-coated cylinder is studied as it has no directionality relative to incoming flow. It is hypothesized that a large coating coverage will cause a reduction in drag dependent on the Reynolds number Re. The fully microfiber-coated cylinder is studied in a wind tunnel and the drag coefficient is determined at a range of Re in the subcritical-flow regime. It is found that the drag coefficient of the microfiber-coated cylinder is a function of Re, and the critical Reynolds number, where the maximum drag reduction occurs, is lower for a microfiber-coated cylinder compared to that of a conventional smooth-surface cylinder.
在人们日益关注航空旅行的环境影响和可持续性的时代，减少翼型物体的阻力势在必行。微纤维涂层已被证明具有减少翼型物体阻力的能力。这是通过在圆柱体上涂覆条状涂层来实现的。为了拓宽微纤维涂层的应用范围，研究了完全涂覆微纤维的圆柱体，因为它相对于来流没有方向性。假设大的涂层覆盖率将导致阻力的降低，这取决于雷诺数 Re。在风洞中对完全涂覆微纤维的圆柱体进行了研究，并在亚临界流区的一系列 Re 下确定了阻力系数。结果表明，微纤维涂层圆柱体的阻力系数是 Re 的函数，发生最大阻力减小的临界雷诺数对于微纤维涂层圆柱体来说比传统的光滑表面圆柱体要低。
