Thermographic inspection and thermal analysis of an experimental wind turbine blade

• Main Authors: Hou-Wei He, 何厚緯
• Other Authors: Chih-Hung Chiang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/75095888299672496622

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 102 === On-site visual inspection of wind turbine blades is time-consuming and labor-intensive. Current study investigates the application of infrared thermography on an experimental scale-down wind turbine blade. The scale-down wind turbine blade has debonded layers in which air or moisture may exist. Thermal images were acquired both indoor and outdoor. Defects contained air layer was found to be cooler while those contained moisture was hotter than the rest of the blade. The images were then analyzed using time-domain polynomial data fitting for synthetic images after temperature difference had been preprocessed using various references. In general the synthetic images of first-order derivative can enhance the defects shortly after the heating in controlled experiments indoor. Two-dimensional finite element models were also applied to the thermal analysis of the blade. The defects were modeled in nine geometrical combinations of three depths, three widths, and three thicknesses. The depth of the defective layer is the most dominate factor in creating the temperature difference on the surface of the blade. The results also confirm that the air layer is in lower temperature and the moisture layer is in higher temperature than the rest of the blade.