scholarly journals Vibration‐based monitoring of a small‐scale wind turbine blade under varying climate conditions. Part I: An experimental benchmark

2020 ◽  
Author(s):  
Yaowen Ou ◽  
Konstantinos E. Tatsis ◽  
Vasilis K. Dertimanis ◽  
Minas D. Spiridonakos ◽  
Eleni N. Chatzi
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Climate Conditions

An Investigation of the Aerodynamic Response of a Wind Turbine Blade to Tower Shadow

2004 ◽  
Vol 126 (4) ◽  
pp. 1034-1040 ◽  
Author(s):  
Xabier Munduate ◽  
Frank N. Coton ◽  
Roderick A.McD. Galbraith
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Careful Consideration ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Force Coefficient ◽  
Velocity Deficit ◽  
Pressure Transducers ◽  
Aerodynamic Model ◽  
Tower Shadow

This paper presents results from a wind tunnel based examination of the response of a wind turbine blade to tower shadow in head-on flow. In the experiment, one of the blades of a small-scale, two-bladed, downwind turbine was instrumented with miniature pressure transducers to allow recording of the blade surface pressure response through tower shadow. The surface pressures were then integrated to provide the normal force coefficient responses presented in this paper. It is shown that it is possible to reproduce the measured responses using an indicially formulated unsteady aerodynamic model applied to a cosine wake velocity deficit. It is also shown that agreement between the model and the measured data can be improved by careful consideration of the velocity deficit geometry.

scholarly journals Design and Development of a New Small-Scale Wind Turbine Blade

2015 ◽  
Author(s):  
Ulan Dakeev ◽  
Quamrul Mazumder ◽  
Faruk Yildiz ◽  
Kenan Baltaci
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Design And Development

Cable Reinforced Small Scale Horizontal Axial Wind Turbine

2013 ◽  
Vol 394 ◽  
pp. 309-313
Author(s):  
Yuan Ma ◽  
Pan Zeng ◽  
Hong Ya Lu ◽  
Yue Jie Xu
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbines ◽  
Noise Level ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Optimum Location ◽  
Reinforcement Structure ◽  
First Order ◽  
Vibration Tests

In this paper, a cable reinforcement structure for small scale horizontal axial wind turbines is proposed. Shock-vibration tests were performed on the cable reinforced structure with different parameters of cable installation. The first order frequency of the blade was chosen to represent the stiffness of the blade rotor. According to the results, an optimum location of cable reinforcement exists at around 1/3 length of the wind turbine blade, and the first order frequency of the blade rotor will rise with the tension of the cable in a certain range. Further analysis showed that besides improving the reliability of the wind turbine rotors, the cable reinforcement structure also provides a possibility to use cheaper materials for blade manufacturing and also control the noise level of small scale horizontal axial wind turbines.

scholarly journals Airfoil types effect on geometry and performance of a small-scale wind turbine blade design

2020 ◽  
Vol 18 (1) ◽  
pp. 132-139
Author(s):  
Sigit Iswahyudi ◽  
S Sutrisno ◽  
P Prajitno ◽  
Setyawan Wibowo
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Blade Design ◽  
And Performance ◽  
Turbine Blade Design

In-situ damage localization for a wind turbine blade through outlier analysis of stochastic dynamic damage location vector-induced stress resultants

2016 ◽  
Vol 16 (6) ◽  
pp. 745-761 ◽  
Author(s):  
Martin Dalgaard Ulriksen ◽  
Dmitri Tcherniak ◽  
Lasse M Hansen ◽  
Rasmus Johan Johansen ◽  
Lars Damkilde ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Small Scale ◽  
Stochastic Dynamic ◽  
Damage Localization ◽  
Outlier Analysis ◽  
Damage Location ◽  
Dynamic Damage ◽  
Characteristic Stress

Today, structural integrity inspections of wind turbine blades are typically carried out by the use of rope or platform access. Since these inspection approaches are both tedious and extremely costly, a need for a method facilitating reliable, remote monitoring of the blades has been identified. In this article, it is examined whether a vibration-based damage localization approach proposed by the authors can provide such reliable monitoring of the location of a structural damage in a wind turbine blade. The blade, which is analyzed in idle condition, is subjected to unmeasured hits from a mounted actuator, yielding vibrations that are measured with a total of 12 accelerometers; of which 11 are used for damage localization. The employed damage localization method is an extended version of the stochastic dynamic damage location vector method, which, in its origin, is a model-based method that interrogates damage-induced changes in a surrogate of the transfer matrix. The surrogate’s quasi-null vector associated with the lowest singular value is converted into a pseudo-load vector and applied to a numerical model of the healthy structure in question, hereby, theoretically, yielding characteristic stress resultants approaching zero in the damaged elements. The proposed extension is based on outlier analysis of the characteristic stress resultants to discriminate between damaged elements and healthy ones; a procedure that previously, in the context of experiments with a small-scale blade, has proved to mitigate noise-induced anomalies and systematic, non-damage-associated adverse effects.

scholarly journals A Comprehensive Analysis of Wind Turbine Blade Damage

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5974
Author(s):  
Dimitris Al. Katsaprakakis ◽  
Nikos Papadakis ◽  
Ιοannis Ntintakis
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Leading Edge ◽  
Wind Turbine Blade ◽  
Surface Erosion ◽  
Wind Turbine Blades ◽  
Adequate Treatment ◽  
Effective Measure ◽  
Climate Conditions

The scope of this article is to review the potential causes that can lead to wind turbine blade failures, assess their significance to a turbine’s performance and secure operation and summarize the techniques proposed to prevent these failures and eliminate their consequences. Damage to wind turbine blades can be induced by lightning, fatigue loads, accumulation of icing on the blade surfaces and the exposure of blades to airborne particulates, causing so-called leading edge erosion. The above effects can lead to damage ranging from minor outer surface erosion to total destruction of the blade. All potential causes of damage to wind turbine blades strongly depend on the surrounding environment and climate conditions. Consequently, the selection of an installation site with favourable conditions is the most effective measure to minimize the possibility of blade damage. Otherwise, several techniques and methods have already been applied or are being developed to prevent blade damage, aiming to reduce damage risk if not able to eliminate it. The combined application of damage prevention strategies with a SCADA system is the optimal approach to adequate treatment.

Experimental Testing of Periodic Roughness Elements on a Small Scale Wind Turbine Blade

2010 ◽  
Author(s):  
Jason R. Gregg ◽  
Kenneth W. Van Treuren
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Experimental Testing ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Speed Ratio ◽  
Small Scale ◽  
Turbine Performance ◽  
Roughness Elements

When studied in large wind turbines, roughness on wind turbine blades has been shown to decrease wind turbine performance by up to 50%. However, during wind turbine testing in the Baylor University Subsonic Wind Tunnel, roughness effects that were an artifact of the blade manufacturing process led to a significant power increase over smooth blades at the design wind speed of 10 mph. These results have led to an investigation of the effects of roughness on wind turbine performance under a flow condition with local Reynolds numbers ranging from 14,200 to 58,800. It was found that under these flow conditions the roughness can improve measured power output by up to 126% when compared with a smooth blade. This paper examines the conditions where roughness can positively affect the operation of a wind turbine by testing a 500 mm diameter, horizontal axis, three blade, fixed pitch wind turbine system in a wind tunnel. The experiments have been carried out on a single direct-drive wind turbine model and a single blade design using the NREL designed S818 airfoil. The design point for the blades tested is 10 miles per hour, with a tip speed ratio of 7. Roughness can be an effective treatment when used at or near the stall speed of the wind turbine blade for lower Reynolds number conditions. The roughness elements tested were both perpendicular to and along the flow lines. These blades were then compared to a blade configuration without roughness elements.

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