DOI: https://doi.org/10.14710/ijred.2023.48616

An investigation of the Steady-State and Fatigue Problems of a Small Wind Turbine Blade Based on the Interactive Design Approach

1UDERZA Laboratory, University of El Oued, 39000 El Oued, Algeria

2Department of Mechanical Engineering, University of El Oued, 39000 El Oued, Algeria

3College of Technical Engineering, Al-Farahidi University, Baghdad 10005, Iraq

4 University of Warith Al-Anbiyaa, College of Engineering Karbala, Iraq

5 Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Iraq

6 Department of Energy Engineering, University of Baghdad, Iraq

7 Department of Mechanics Al-Farabi Kazakh National University, Kazakhstan, Baghdad, Iraq

8 System Technologies and Engineering Design Methodology, Hamburg University of Technology, Hamburg, Germany

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Received: 29 Aug 2022; Revised: 12 Nov 2022; Accepted: 8 Dec 2022; Available online: 18 Dec 2022; Published: 1 Jan 2023.
Editor(s): H Hadiyanto
Open Access Copyright (c) 2023 The Author(s). Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract

A wind turbine blade is an essential system of wind energy production. During the operation of the blade, it is subjected to loads resulting from the impact of the wind on the surface of the blade. This leads to appear large deflections and high fatigue stresses in the structure of blades. In this paper, a 5 kW horizontal axis wind turbine blade model is designed and optimized using a new MATLAB code based on blade element momentum (BEM) theory.The aerodynamic shape of the blade has been improved compared with the initial design, the wind turbine power has been increased by 7% and the power coefficient has been increased by 8%.  The finite Element Method was used to calculate the loads applied to the blade based on Computational Fluid Dynamics (CFD) and BEM theory.High agreements were obtained between the results of both approaches (CFD and BEM).The ANSYS software was also used to simulate and optimize the structure of the blade by applying variable static loads 3.3, 6, and 8.3 kg and compared the results with the experimental results. It was reduced the maximum deflectionswith 37%, 42.85%, and 42.61% when using CFRP material and 4.5%, 15.45%, and 16.19% for GFRP material that corresponds to the applied forces. Based on the results, the mass of the optimized model decreased by 47.86% for GFRP and 71.24% for CFRP. IEC 61400.2 standard was used to estimate thefatigue loads, damage, blade life prediction, and verify blade safety usinga Simplified Load Model(SLM) and FAST software. It was found that the blade will be safe under extreme wind loads, and the lifetime of the wind blade (GFRP) is 5.5 years and 10.25 years,according to SLM and FAST software, respectively. At the same time, the lifetime of the wind blade (CFRP)is more than 20 years, according to the two applied methods.

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Keywords: damage; composite materials; fatigue life; standard IEC 61400.2; Simplified Load Model; FAST software

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Section: Original Research Article
Language : EN
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