Long-term fatigue reliability enhancement of horizontal axis wind turbine blade

IF 1.3 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Wind and Structures Pub Date : 2021-08-01 DOI:10.12989/WAS.2021.33.2.169

M. Sajeer, A. Chakraborty

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Abstract

The enhancement of fatigue life of ultra-large horizontal axis wind turbine blade using longitudinal stiffening is the theme of this work. For this purpose, a tendon made of shape memory alloy is used along the longitudinal axis of blade, which is modelled in aeroelastic spinning finite element framework. The force developed in the tendon acts against the deformation where the material is modelled using Liang and Rogers constitutive relationship along with the principles of thermodynamics. The fatigue design follows the guidelines provided in internationally recognised codal provisions. The blade responses are simulated using aeroelastic loads obtained from blade element momentum theory. These dynamic responses are utilised to evaluate the longitudinal stress in the extreme fibre over the blade profile. Then, short-term and long-term damages are evaluated using rainflow matrix obtained from these stresses. Finally, the reliability of blade against fatigue failure is investigated. The numerical analysis presented in this study clearly demonstrates the performance of the longitudinal stiffening in combination with pitch angle on the fatigue life of the blade.

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提高水平轴风力涡轮机叶片长期疲劳可靠性

采用纵向强化技术提高超大型水平轴风力机叶片的疲劳寿命是本研究的主题。为此，在叶片的纵轴上使用形状记忆合金制成的腱，并在气动弹性旋转有限元框架中进行建模。在肌腱中产生的力对材料的变形起作用，使用梁和罗杰斯的本构关系以及热力学原理对材料进行建模。疲劳设计遵循国际公认的准则规定。利用叶片单元动量理论得到的气动弹性载荷对叶片响应进行了模拟。这些动态响应被用来评估叶片轮廓上极端纤维的纵向应力。然后，利用这些应力得到的雨流矩阵对短期和长期损伤进行了评估。最后，对叶片的抗疲劳可靠性进行了研究。本文的数值分析清楚地揭示了纵向加筋结合俯仰角对叶片疲劳寿命的影响。

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来源期刊

Wind and Structures 工程技术-工程：土木

CiteScore

2.70

自引率

18.80%

发文量

审稿时长

>12 weeks

期刊介绍： The WIND AND STRUCTURES, An International Journal, aims at: - Major publication channel for research in the general area of wind and structural engineering, - Wider distribution at more affordable subscription rates; - Faster reviewing and publication for manuscripts submitted. The main theme of the Journal is the wind effects on structures. Areas covered by the journal include: Wind loads and structural response, Bluff-body aerodynamics, Computational method, Wind tunnel modeling, Local wind environment, Codes and regulations, Wind effects on large scale structures.