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Investigation on drag performance of anti-fouling painted flat plates in a cavitation tunnel

机译：空化隧道中防污漆平板的阻力性能研究

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The flat plate coated with silicone-type Tin-free self-polishing co-polymer (SPC) or the conventional metal-type Tin-free SPC is prepared to investigate the drag performance of the anti-fouling SPC. The local skin friction of anti-fouling paints is evaluated by a flat plate model test method in the cavitation tunnel. The properties of the boundary layer and the drag performance are investigated by flow and force measurement techniques. The silicone-type SPC paint shows better drag performance than the metal-type paint in the high speed regime. The silicone-type SPC paints also show decreasing roughness function (Delta U+) with the increase of displacement thickness Reynolds number (Re-delta*) and roughness Reynolds number (k(s)(+)). Even in the same silicone-type SPC paints with similar roughness function, drag performance appears differently. The different drag performance in the silicone-type SPC painted surfaces is considered to be affected by different turbulent vortical structures caused by the surface roughness. Y-directional peak position of streamwise turbulence intensity is utilized to estimate the existence of vortical structure. To investigate the reason of the different drag performance in the silicone-type SPC painted surfaces, the POD analysis, extracting the most energetic flow fields, is adopted to find the effects of cross-flow velocity component caused by the turbulent vortical structure. (C) 2015 Elsevier Ltd. All rights reserved.
机译：制备涂覆有硅酮型无锡自抛光共聚物（SPC）或常规金属型无锡SPC的平板，以研究防污SPC的阻力性能。通过在空化通道中的平板模型测试方法评估防污漆的局部皮肤摩擦。边界层的性质和阻力性能通过流量和力的测量技术进行了研究。在高速状态下，硅酮型SPC涂料的拖曳性能优于金属型涂料。随着位移厚度雷诺数（Re-delta *）和粗糙度雷诺数（k（s）（+））的增加，有机硅型SPC涂料的粗糙度函数（Delta U +）也降低。即使在具有相似粗糙度功能的相同有机硅型SPC涂料中，拖曳性能也会有所不同。认为在有机硅型SPC涂漆的表面上，不同的阻力性能受表面粗糙度引起的不同涡流结构的影响。利用湍流强度的Y方向峰值位置来估计旋涡结构的存在。为了研究有机硅型SPC涂漆表面阻力性能不同的原因，采用POD分析提取了最活跃的流场，以发现湍流旋涡结构引起的横流速度分量的影响。 （C）2015 Elsevier Ltd.保留所有权利。

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