巴沙木在风机叶片应用中的缺陷分析

Defect Analysis of the Balsa in Turbine Blade

针对目前巴沙木在风机叶片应用中出现的发白缺陷,分析界面层发白缺陷产生的机理,模拟巴沙木在风机叶片生产中所产生的缺陷,并给出了缺陷产生的原因和采取的应对措施。结果表明,在一定范围内,固化反应的最大放热温度随着巴沙木含水率的增加而提高;水在固化反应过程中,受热汽化运动聚集在界面层形成发白缺陷;巴沙木含水率大于8%时,夹心结构件界面层可能出现发白缺陷,且随含水率的增加发白缺陷的严重度增加,建议在巴沙木铺设前,烘烤控制其含水率不大于8%;巴沙木缺陷修补后灌注出的夹心结构件表面未出现外观缺陷,但夹心结构件的力学性能还待评估。

In view of the white defects in the current application of balsa in the turbine blades,this paper analyzes the mechanism of the white defects in the interface layer,simulates the defects of balsa in the production of turbine blades,and gives the causes of the defects and the countermeasures.The results show that the maximum exothermic temperature of curing reaction increases with the increase of moisture content of balsa in a certain range;during the process of curing reaction,the heated vaporization movement gathers in the interface layer to form the whitening defect;when the moisture content of balsa is greater than 8%,the interface layer of sandwich structure may appear the whitening defect,and the severity of the whitening defect increases with the increase of moisture content.It is suggested that the moisture content of balsa should not be more than 8%by baking before laying.There is no appearance defect on the surface of the sandwich structure poured out after the repair of balsa defect,but the mechanical properties of the sandwich structure need to be evaluated.