Abstract To develop a better understanding of ‘in-service’ performance of modern marine coatings, this study explored the combined effects of different roughness ranges of foul-release coating (FRC) and light biofouling (slime) on the surface, boundary layer and drag characteristics under a range of ‘in-service’ conditions. Natural and laboratory biofilms were grown dynamically on FRC panels by exposing panels in facilities dedicated to realistic fouling culture. The boundary layer experiments were conducted in a circulating water tunnel. Boundary layer similarity-law scaling was used to predict the combined effects of coating roughness and biofilms on the added frictional resistance (% and added required effective power ) for a benchmark KRISO container ship (KCS) and a bulk carrier. The increase in due to the presence of biofilms on commercial FRC is estimated to be between 7% and 16% depending on the biofilm type, biofilm thickness and percentage coverage. Significant increases in effective power are estimated for non-fouling control primers with heavy fouling. Moreover, the paper suggests updated roughness allowances ( ) for two vessel types assuming FRCs on their hulls with more representative hull roughness ranges and fluffy biofilms.

中文翻译：

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“在役”条件——模拟船体粗糙度范围和生物膜——对释污型涂层表面和流体动力学特性的影响

摘要 为了更好地了解现代船舶涂料的“在役”性能，本研究探讨了不同粗糙度范围的污垢释放涂层 (FRC) 和轻质生物污垢（粘液）对表面、边界层和阻力的综合影响。在一系列“使用中”条件下的特性。通过将面板暴露在专门用于现实污垢培养的设施中，自然和实验室生物膜在 FRC 面板上动态生长。边界层实验在循环水隧道中进行。边界层相似性定律用于预测涂层粗糙度和生物膜对基准 KRISO 集装箱船 (KCS) 和散货船增加的摩擦阻力（% 和增加的所需有效功率）的综合影响。根据生物膜类型、生物膜厚度和百分比覆盖率，由于商业 FRC 上存在生物膜而导致的增加估计在 7% 到 16% 之间。对于具有严重污垢的非污垢控制底漆，估计有效功率显着增加。此外，该论文建议更新两种船舶的粗糙度容差 ( )，假设船体上的 FRC 具有更具代表性的船体粗糙度范围和蓬松的生物膜。