Experiments on the effects of aging on compliant coating drag reduction
Experiments on the effects of aging on compliant coating drag reduction
复制标题
DOI：
10.1063/1.2008997
复制
发表时间：
2005-08-01
影响因子：
4.6
通讯作者：
Escudier, MP
中科院分区：
文献类型：
--
作者：
Bandyopadhyay, PR;Henoch, C;Escudier, MP
我们报告了美国、俄罗斯和英国合作开发用于海底减阻应用的顺应性涂层的实验结果。重点放在涂层的“保质期”上。该涂层基于湍流压力波动与粘弹性涂层相互作用的线性干涉理论。边界位移与压力波动之间的相移体现了干涉效应。涂层的固有频率与产生最大雷诺应力的湍流边界层区相匹配。低分子量橡胶类有机硅涂料的性能包括缓慢和快速的衰减，缓慢和快速的老化，以及不同程度的弹性、密度、厚度和透明度。动态模数和损耗正切在一定的频率和温度范围内变化很小，允许与宽谱的湍流兼容。这三个团队已经在他们的水洞中独立于相同的涂层模型进行了一年多的阻力测量。结果表明，除某些例外情况外，减阻效果一般随着涂层的老化而恶化。(C)2005年美国物理研究所。
We report the experimental results from a collaborative effort between USA, Russia, and UK on the development of compliant coatings for undersea application of reduction of drag. The focus is on "shelf-life" of coatings. The coatings are based on a linear interference theory of interaction between turbulence pressure fluctuation and the viscoelastic coating. The phase shift between boundary displacement and pressure fluctuation embodies the interference effect. The natural frequency of the coating is matched to the turbulent boundary layer region of maximum Reynolds stress production. Low-molecular weight rubber-like silicone coatings have been manufactured whose properties include slow and fast damping, slow and fast aging, and varying magnitudes of elasticity, density, and thickness as well as transparency. The dynamic modulus and loss tangent vary weakly over a range of frequencies and temperature allowing compatibility with broad spectrum of turbulence. Drag measurements have been carried out over a year by the three teams in their water tunnels independently of identical coated models. We show that, with some exceptions, drag reduction generally deteriorates with the age of the coatings. (c) 2005 American Institute of Physics.