生物工程涂料用于被动流动控制

2019/12/02   下载量： 0 次

方案摘要

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应用领域 石油/化工
检测样本 涂料
检测项目
参考标准 暂无

采用德国LaVision公司2D2C平面粒子成像测速(PIV)系统。对边生物工程涂料边界层流场，采用高空间分辨率的PIV+PTV分析方法计算流体速度矢量场，分析了生物工程涂料用于被动流动控制的可行性。

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Flow separation and vortex shedding are some of the most common phenomena experienced by bluff bodies under relative motion with the surrounding medium. They often result in a recirculation bubble in regions with adverse pressure gradient, which typically reduces efficiency in vehicles and increases loading on structures. Here, the ability of an engineered coating to manipulate the large-scale recirculation region was tested in a separated flow at moderate momentum thickness Reynolds number,Re = 1,200. We show that the coating, composed of uniformly distributed cylindrical pillars with diverging tips, successfully reduces the size of, and shifts downstream, the separation bubble. Despite the so-called roughness parameter, k+ 1, falling within the hydrodynamic smooth regime, the coating is able to
modulate the large-scale recirculating motion. Remarkably, this modulation does not induce noticeable changes in the near-wall turbulence levels. Supported with experimental data and theoretical arguments based on the averaged equations of motion, we suggest that the inherent mechanism responsible for the bubble modulation is essentially unsteady suction and blowing controlled by the increasing cross-section of the tips. The coating can be easily fabricated and installed and works under dry and wet conditions, increasing its potential impact on a diverse range of applications.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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