Research Papers

3D Woven Carbon/Glass Hybrid Spar Cap for Wind Turbine Rotor Blade

[+] Author and Article Information
Mansour H. Mohamed

 3TEX, Inc., Cary, NC 27511

Kyle K. Wetzel

 Wetzel Engineering, Inc., Lawrence, KS 66046

J. Sol. Energy Eng 128(4), 562-573 (Aug 03, 2006) (12 pages) doi:10.1115/1.2349543 History: Received April 10, 2006; Revised August 03, 2006

This paper presents the design and analysis for a spar cap for a wind turbine rotor blade. The cap is formed of an integral, unitary 3D woven material (3WEAVE®) having constant thickness; spar cap weight is varied and controlled by appropriately tapering the cap width from the blade root to tip. This analysis is employed for 24-m and 37-m rotor blades. These studies are conducted parametrically, examining a range of 3WEAVE® materials incorporating varying fractions of glass and carbon fibers, and hence exhibiting a range of structural properties and material costs. These parametric studies are used to determine the impact on blade weight and cost resulting from the various materials studied. Detailed results are presented in the form of tables to enable candidate materials to be evaluated as they are developed.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of 3WEAVE®, 3D orthogonal woven structure, and unit cell geometry nomenclature

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Figure 2

The 3WEAVE® spar cap seven warp layers fabric

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Figure 3

Baseline flapwise bending moment distributions

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Figure 4

Baseline stiffness results

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Figure 5

Required spar cap dimensions for deflection constraint

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Figure 6

Effect of spar cap dimensions on the blade mass

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Figure 7

Effect of spar cap dimensions on the spar cap mass

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Figure 8

Effect of spar cap dimensions on the structural material cost

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Figure 9

Maximum tensile strain in the spar cap

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Figure 10

Blade root static moment

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Figure 11

37-m blade geometry



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