Advances in wind turbine blade design and materials

Brøndsted, Povl; Nijssen, R.P.L.

doi:10.1533/9780857097286

Cited by 83 publications

(55 citation statements)

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“…Fatigue can have a direct or indirect effect on the overall performance of wind turbine blades, accelerating their degradation process and decreasing their energy production efficiency. According to Brondsted [3], fa- 45 tigue relies on three design drivers of the blades; aerodynamic performance (blade shape), power performance (power efficiency, power curves, noise) and loading performance. Wind turbine blades and rotors are subjected to a high number of loading-unloading cycles, with highly stochastic loads (at times reaching extremes) during their baseline service life of 20 years.…”

Section: Loading Of Wind Turbine Bladesmentioning

confidence: 99%

“…They share common features with the large scale ones in terms of structural design. Nevertheless, as their surface exposure is decreased, they are less exposed to environmental hazards and load variation generated by wind-loadinginduced shear surface and gravity [3]. Furthermore, rotational speed (centrifugal stresses) and gyroscopic loads are higher in comparison to large wind turbine blades, implying higher fatigue cycles.…”

Section: Loading Of Wind Turbine Bladesmentioning

confidence: 99%

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State of the art in fatigue modelling of composite wind turbine blades

Rubiella

Hessabi

Fallah

2018

International Journal of Fatigue

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This paper provides a literature review of the most notable models relevant to the evaluation of the fatigue response of composite wind turbine blades. As wind turbines spread worldwide, ongoing research to maximize their lifetime -and particularly that of wind turbine blades -has increasingly popularized the use of composite materials, which boast attractive mechanical properties. The review first presents the wind turbine blade environment, before distributing fatigue models broadly between three categories: life-based failure criterion models, which are based on S-N curve formulations and constant-life diagrams to introduce failure criteria; residual property calculation models, which evaluate the gradual degradation of material properties; and progressive damage models, which model fatigue via the cycle-by-cycle growth of one or more damage parameters. These are then linked to current testing standards, databases, and experimental campaigns. Among the fatigue modeling approaches covered, progressive damage models appear to be the most promising tool, as they both quantify and qualify physical damage growth to a reasonable extent during fatigue. The lack of consensus and shortcomings of literature are also discussed, with abundant referencing.This review aims to provide an overview of the current methods, in comparison to the other ones and most prominent theories, through a critical viewpoint, so as to be constructive and conclusive. Despite the fact that the fatigue behaviour of metals are already well-developed and validated, their "conventional" fatigue models may not be applied to composites due to their high anisotropic and heterogeneous behaviour.The underlying aim is to identify new paths for future improvements and shed light on the most ambiguous 40 aspects of composite fatigue research, particularly in the evolving case of wind turbine applications. 70 account for such effects, as we shall see.As wind turbines increase in size, the edgewise fatigue loading becomes increasingly relevant for life prediction, as shown by Kensche [7]. In addition, the torsional eigenfrequency drops, with a risk that it may couple with lower bending modes, with disastrous consequences. Toward the trailing and leading edge of the blade structure, gravity increasingly dominates the stress and strains applied to the load-bearing structure in the 75 rotor plane. An alternating, cyclic stress emerges as a result, with mean stress almost null. Furthermore,

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Section: Loading Of Wind Turbine Bladesmentioning

confidence: 99%

Section: Loading Of Wind Turbine Bladesmentioning

confidence: 99%

State of the art in fatigue modelling of composite wind turbine blades

Rubiella

Hessabi

Fallah

2018

International Journal of Fatigue

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“…The objective of the airfoil design optimization was to maximize both the I XX of the airfoil, as well as the weighted-sum lift-to-drag ratio (C L ∕C D ) under clean and rough conditions; a high C L ∕C D will increase rotor torque, while minimizing bending moments on the rotor in the flapwise direction. 23 The C L ∕C D values were integrated over a 6 • angle of attack range for both rough and clean conditions, which ensures good performance in off-design conditions. In addition, it is favorable that the airfoils achieve high maximum lift that allows for a slender blade design, which helps alleviate extreme loads under parked conditions.…”

Section: Objectives and Constraintsmentioning

confidence: 99%

The development of a flatback wind turbine airfoil family

2018

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Flatback airfoils show several potential benefits in the design of wind turbine blades. Structurally, the increased trailing‐edge thickness offers high resistance to flapwise bending, while aerodynamically, a higher maximum coefficient of lift, as well as better roughness insensitivity, may be achieved. In this work, the design of a flatback airfoil family is performed with a high degree of attention to the appropriate selection of design constraints and objectives. Through the analysis of other airfoils available in the literature, and through sensitivity analyses of several design parameters, the CU‐W1‐XX airfoil family is designed. The optimization tool used in this work consists of a genetic algorithm in which the airfoil shapes are altered using Bézier curve parameterization. The aerodynamic performance is evaluated using XFOIL while the structural performance is evaluated from the sectional moment of inertia about the chord. In several metrics such as sectional moment of inertia, roughness insensitivity, and lift‐to‐drag ratio, the CU‐W1‐XX family is shown to have equal or superior performance as compared with other airfoils, thus proving the capability of the airfoil optimization tool and, more importantly, the value of proper design constraints and objectives.

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“…It would be a little unconscious placing VAWT rather than HAWT in places where the latter generate more production, even having VAWT that reach 4MW, as the case of Éole, located in Cap Chat, Quebec, Canada and with a height of 110 meters and 96 meters in diameter, is the largest ever VAWT installed [12]. Fig.…”

Section: Future Trendsmentioning

confidence: 99%

Vertical Axis Wind Turbines: Current Technologies and Future Trends

Damota

Lamas

Couce

et al. 2015

REPQJ

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Abstract. This paper, based on the pursuit of scientific articles published and recorded in the last five years (2010-2014) patents on VAWT technology, gives an image of the current situation of the treated technology.From data extracted we know: The different models that are working with different geometries, distinguishing between Savonius, Darrieus, hybrid of both (D+S), models dedicated to Offshore technology and what can be applied generally (D&S) on both types of VAWT (controllers, electric generators, materials ...).The main countries that research and develop VAWT technology, globally and at European level and the number of dedicated studies and patents each.Multiple applications that can be given in fields such as building, industrial environment, social areas, civil engineering and other more.Future trends for VAWT, which can be seen in our environment, both rural and urban, as has already happened with other renewable technologies for electricity production, as HAWT and photovoltaic (PV), becoming part of the mix of renewable energy technology and business network of the future, thereby contributing to the reduction of CO 2 production and economic growth.

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Advances in wind turbine blade design and materials

Cited by 83 publications

References 0 publications

State of the art in fatigue modelling of composite wind turbine blades

State of the art in fatigue modelling of composite wind turbine blades

The development of a flatback wind turbine airfoil family

Vertical Axis Wind Turbines: Current Technologies and Future Trends

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