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Fatigue life of pitch- and stall-regulated composite tidal turbine blades

机译：变桨和失速调节复合潮汐涡轮机叶片的疲劳寿命

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Tidal turbine blades are subject to harsh loading and environmental conditions, including large thrust and torsional loadings, relative to wind turbine blades, due to the high density of seawater, among other factors. The complex combination of these loadings, as well as water ingress and associated composite laminate saturation, have significant implications for blade design, affecting overall device design, stability, scalability, energy production and cost-effectiveness. This study investigates the effect of seawater ingress on composite material properties, and the associated design and life expectancy of tidal turbine blades in operating conditions. The fatigue properties of dry and water-saturated glass fibre reinforced laminates are experimentally evaluated and incorporated into tidal blade design. The fatigue lives of pitch- and stall-regulated tidal turbine blades are found to be altered by seawater immersion. Water saturation is shown to reduce blade life about 3 years for stall-regulated blades and by about 1-2 years for pitch-regulated blades. The effect of water ingress can be compensated by increased laminate thickness. The tidal turbine blade design methodology presented here can be used for evaluation of blade life expectancy and tidal device energy production. (C) 2018 Elsevier Ltd. All rights reserved.
机译：由于海水的高密度，潮汐涡轮机叶片承受着苛刻的载荷和环境条件，包括相对于风力涡轮机叶片而言较大的推力和扭转载荷。这些载荷的复杂组合，以及进水和相关的复合层压板饱和度，对叶片设计具有重要意义，影响了整个设备的设计，稳定性，可扩展性，能源生产和成本效益。这项研究调查了海水进入对复合材料性能的影响，以及潮汐涡轮机叶片在运行条件下的相关设计和预期寿命。对干燥和水饱和的玻璃纤维增​​强层压板的疲劳性能进行了实验评估，并将其纳入潮汐叶片设计中。俯仰和失速调节的潮汐涡轮机叶片的疲劳寿命被海水浸泡所改变。对于失速调节的叶片，水饱和度可将叶片寿命降低约3年，而对变桨角的叶片则可降低叶片寿命约1-2年。可以通过增加层压板的厚度来补偿进水的影响。此处介绍的潮汐涡轮机叶片设计方法可用于评估叶片预期寿命和潮汐装置的能量产生。 （C）2018 Elsevier Ltd.保留所有权利。

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