Preparation of protective coatings for the leading edge of wind turbine blades and investigation of their water droplet erosion behavior

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-09-10 DOI:10.1016/j.wear.2024.205568
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引用次数: 0

Abstract

The damage caused by rain droplet erosion to the leading edge of wind turbine blades is extremely severe. To reduce this issue, in this study, hydroxyl-terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI) were used as the polyurethane (PU) polyol and curing agent, respectively, to prepare a PU coating with a high resistance to water droplet erosion (WDE) for the protection of the leading edge of wind turbine blades. The effect of n (–NCO):n (–OH) (R-value, n is the molar ratio) on the mechanical properties and WDE resistance of PU coatings, the relationship between the two performances, and the influence of the erosion conditions on the WDE behavior were investigated for the first time. The results show the existence of a correlation between the mechanical properties (hardness, impact, flexibility, and tensile strength) and WDE resistance of the coating. While, a better abrasion resistance is found not to result in a better WDE resistance. The PU coating with an R-value of 1.2 shows an optimal WDE resistance in both atomization and jet erosion experiments. In atomized droplet erosion (ADE) experiments, the change in erosion velocity accelerates the incubation period of coating erosion damage and increases the erosion rate. In jet droplet erosion (JDE) experiments, the damage to the coating is closely related to the erosion angle, reaching a maximum at an impact angle of 60°. Furthermore, in the ADE experiments, various erosion morphologies, such as pits, grooves, cracks, and stepped texture, are observed on the damaged coating surface. While, regarding the JDE experiments, holes, grooves, and cracks are observed. Such damage is caused by the combined effects of water hammer pressure, lateral jets, and local permeation.

风力涡轮机叶片前缘保护涂层的制备及其水滴侵蚀行为研究
雨滴对风力涡轮机叶片前缘的侵蚀造成了极其严重的损坏。为了减少这一问题,本研究采用羟基封端聚丁二烯(HTPB)和异佛尔酮二异氰酸酯(IPDI)分别作为聚氨酯(PU)多元醇和固化剂,制备了一种具有高抗水滴侵蚀(WDE)性能的聚氨酯涂层,用于保护风力涡轮机叶片的前缘。首次研究了 n (-NCO):n (-OH)(R 值,n 为摩尔比)对聚氨酯涂层机械性能和抗水滴侵蚀性的影响、两种性能之间的关系以及侵蚀条件对水滴侵蚀行为的影响。结果表明,涂层的机械性能(硬度、冲击力、柔韧性和拉伸强度)与耐 WDE 性之间存在相关性。而耐磨性越好,其抗 WDE 性能也就越好。R 值为 1.2 的聚氨酯涂层在雾化和喷射侵蚀实验中都表现出了最佳的抗 WDE 性能。在雾化液滴侵蚀(ADE)实验中,侵蚀速度的变化加快了涂层侵蚀损伤的潜伏期并提高了侵蚀速率。在喷射液滴侵蚀(JDE)实验中,涂层的损伤与侵蚀角度密切相关,在冲击角度为 60° 时达到最大值。此外,在 ADE 实验中,在受损涂层表面观察到各种侵蚀形态,如凹坑、沟槽、裂纹和阶梯纹理。而在 JDE 实验中,则观察到孔洞、沟槽和裂纹。这种损坏是由水锤压力、横向喷射和局部渗透的共同作用造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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