Research Papers: Alternative Energy Sources

Design and Optimization of Composite Offshore Wind Turbine Blades

[+] Author and Article Information
M. Tarfaoui

ENSTA Bretagne,
Brest, F-29200, France;
Nanomaterials Laboratory,
University of Dayton,
Dayton, OH 45469-0168
e-mail: mostapha.tarfaoui@ensta-bretagne.fr

O. R. Shah

ENSTA Bretagne,
Brest, F-29200, France

M. Nachtane

ENSTA Bretagne,
Brest, F-29200, France;
Laboratory for Renewable Energy and
Dynamic Systems,
Casablanca, 20100, Morocco
e-mail: mourad.nachtane@ensta-bretagne.org

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 6, 2018; final manuscript received December 17, 2018; published online January 18, 2019. Assoc. Editor: Ryo Amano.

J. Energy Resour. Technol 141(5), 051204 (Jan 18, 2019) (9 pages) Paper No: JERT-18-1412; doi: 10.1115/1.4042414 History: Received June 06, 2018; Revised December 17, 2018

In order to obtain an optimal design of composite offshore wind turbine blade, take into account all the structural properties and the limiting conditions applied as close as possible to real cases. This work is divided into two stages: the aerodynamic design and the structural design. The optimal blade structural configuration was determined through a parametric study by using a finite element method. The skin thickness, thickness and width of the spar flange, and thickness, location, and length of the front and rear spar web were varied until design criteria were satisfied. The purpose of this article is to provide the designer with all the tools required to model and optimize the blades. The aerodynamic performance has been covered in this study using blade element momentum (BEM) method to calculate the loads applied to the turbine blade during service and extreme stormy conditions, and the finite element analysis was performed by using abaqus code to predict the most critical damage behavior and to apprehend and obtain knowledge of the complex structural behavior of wind turbine blades. The approach developed based on the nonlinear finite element analysis using mean values for the material properties and the failure criteria of Hashin to predict failure modes in large structures and to identify the sensitive zones.

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Fig. 1

Different blade cross sections considered in the study: (a) shell, (b) two vertical/box type VV/box, (c) H type/box with horizontal H sec/box H, (d) three vertical/box with vertical VVV/box V, (e) vertical frontal D sec, (f) vertical mid V, (g) vertical horizontal HV, and (h) box with horizontal frontal HVV

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Fig. 2

Summary of deflections of different section types of different materials in use

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Fig. 3

Distribution of the thickness

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Fig. 4

Mesh size convergence

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Fig. 5

Effect of the twist pivot on the form of the spar: (a) blade 1 and (b) blade 2

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Fig. 6

Representation of the damage in the blade 1

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Fig. 7

Representation of the damage in the blade 2

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Fig. 8

Damaged zones after modifications

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Fig. 9

Distribution of thickness

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Fig. 10

Damaged zone: (a) before changing the thickness and (b) before changing the thickness

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Fig. 11

Onset of damage in blade 1, NACA-4424-60m-200 MPa: (a) stress distribution and (b) appearance of damage

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Fig. 12

Onset of damage in blade 2, NACA-4424-60m-CL-200 MPa: (a) stress distribution and (b) appearance of damage



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