Exploring the potentialities of thermal asymmetries in composite wind turbine blade structures via numerical and thermographic methods: a thermophysical perspective

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
A. A. A. Figueiredo, G. D’Alessandro, S. Perilli, S. Sfarra, H. Fernandes
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Abstract

Using composite materials in turbine blades has become common in the wind power industry due to their mechanical properties and low mass. This work aims to investigate the effectiveness of the active infrared thermography technique as a non-destructive inspection tool to identify defects in composite material structures of turbine blades. Experiments were carried out by heating the sample and capturing thermographic images using a thermal camera in four different scenarios, changing the heating strategy. Such a preliminary experiments are prodromic to build, in future, the so-called optimal experiment design for thermal property estimation. The experimental results using two heaters arranged symmetrically on the sample detected the presence of the defect through temperature curves extracted from thermal images, where temperature asymmetries of 25% between the regions with and without defect occurred. Moreover, when only a larger heater was used in transmission mode, the defect was detected based on differences between normalized excess temperatures on the side with and without the defect in the order of 20%. Additionally, numerical simulations were carried out to present solutions for improving defect detection. It was demonstrated that active infrared thermography is an efficient technique for detecting flaws in composite material structures of turbine blades. This research contributes to advancing knowledge in inspecting composite materials.

Abstract Image

通过数值和热成像方法探索复合材料风力涡轮机叶片结构热不对称的潜力:热物理视角
由于复合材料的机械性能和低质量,在涡轮叶片中使用复合材料已成为风力发电行业的普遍现象。这项工作旨在研究主动红外热成像技术作为非破坏性检测工具在识别涡轮叶片复合材料结构缺陷方面的有效性。实验采用了四种不同的方案,通过改变加热策略加热样品并使用热像仪捕捉热成像图像。这样的初步实验对今后建立所谓的热性能评估最佳实验设计具有前瞻性意义。实验结果显示,使用两个对称布置在样品上的加热器,通过从热图像中提取的温度曲线检测到了缺陷的存在,其中有缺陷和无缺陷区域的温度不对称程度达到了 25%。此外,在透射模式下只使用一个较大的加热器时,根据有缺陷一侧和无缺陷一侧归一化过剩温度之间 20% 的差异,也能检测出缺陷。此外,还进行了数值模拟,以提出改进缺陷检测的解决方案。研究表明,主动红外热成像技术是检测涡轮叶片复合材料结构缺陷的有效技术。这项研究有助于促进复合材料检测知识的发展。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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