scholarly journals Investigating the impact of non-linear geometrical effects on wind turbine blades-Part 1: Current status of design and test methods and future challenges in design optimization

Wind Energy ◽  
2010 ◽  
Vol 14 (2) ◽  
pp. 239-254 ◽  
Author(s):  
Find M. Jensen ◽  
Amit S. Puri ◽  
John P. Dear ◽  
Kim Branner ◽  
Andrew Morris
Keyword(s):  
Wind Turbine ◽  
Design Optimization ◽  
Turbine Blades ◽  
Test Methods ◽  
Current Status ◽  
Wind Turbine Blades ◽  
Non Linear ◽  
Future Challenges ◽  
Geometrical Effects ◽  
The Impact

scholarly journals Brief communication: Nowcasting of precipitation for leading-edge-erosion-safe mode

2020 ◽  
Vol 5 (3) ◽  
pp. 977-981 ◽  
Author(s):  
Anna-Maria Tilg ◽  
Charlotte Bay Hasager ◽  
Hans-Jürgen Kirtzel ◽  
Poul Hummelshøj
Keyword(s):  
Liquid Phase ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Leading Edge ◽  
Wind Turbine Blades ◽  
Spatio Temporal ◽  
The Impact ◽  
Theoretical Considerations ◽  
Mode A ◽  
Precipitation Events

Abstract. Leading-edge erosion (LEE) of wind turbine blades is caused by the impact of hydrometeors, which appear in a solid or liquid phase. A reduction in the wind turbine blades' tip speed during defined precipitation events can mitigate LEE. To apply such an erosion-safe mode, a precipitation nowcast is required. Theoretical considerations indicate that the time a raindrop needs to fall to the ground is sufficient to reduce the tip speed. Furthermore, it is described that a compact, vertically pointing radar that measures rain at different heights with a sufficiently high spatio-temporal resolution can nowcast rain for an erosion-safe mode.

Design optimization of wind turbine blades for reduction of airfoil self-noise

2013 ◽  
Vol 27 (2) ◽  
pp. 413-420 ◽  
Author(s):  
Seunghoon Lee ◽  
Soogab Lee ◽  
Jaeha Ryi ◽  
Jong-Soo Choi
Keyword(s):  
Wind Turbine ◽  
Design Optimization ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Airfoil Self Noise

Development of wireless bird collision monitoring system using 0-3 piezoelectric composite sensor on wind turbine blades

2017 ◽  
Vol 29 (17) ◽  
pp. 3426-3435
Author(s):  
Sang-Hyeon Kang ◽  
Lae-Hyong Kang
Keyword(s):  
Wind Turbine ◽  
Monitoring System ◽  
Wind Turbines ◽  
Turbine Blades ◽  
Wind Farms ◽  
Clean Energy ◽  
Piezoelectric Composite ◽  
Collision Rate ◽  
Wind Turbine Blades ◽  
The Impact

Over the past several decades, wind turbines have been established as one of the promising renewable energy systems for safe and clean energy collection. In order to collect more energy efficiently, the size of wind turbines has been increased and many wind farms have been constructed. Wind farms generate lots of energy, but they cause several side effects, such as noise and a threat to wildlife. It is reported that the bird collision rate of a wind turbine ranges from 0.01 to 23 annually. It is more serious in the case of rare and endangered birds. In order to monitor the effect on birds in wind farms, researchers have developed remote sensing technology for a detection apparatus using heat and radar. In addition, paint color and other variables have been studied regarding their effects on the collision rate. However, the existing methods are passive ways to prevent bird collision or just monitor bird conditions. Therefore, in this study, we propose a bird collision monitoring system that can detect where the bird collision occurred, which will aid in rescuing the birds. If the wind turbine blade has its own ability to capture an impact signal, the impact location can be easily detected, and the birds can be rescued. For this purpose, piezoelectric paint was applied to the wind turbine blades used in this study. The piezoelectric paint is also known as 0-3 piezoelectric composite, which is composed of piezoelectric particles and polymer resin. It is sensitive to high-frequency signals such as impacts, so it is suitable for monitoring bird collision signals. In order to amplify and transmit the impact signal from the rotating blade to a stationary base, a wireless transmission device using a ZigBee module and signal conditioning circuit was also installed. Through lab-scale tests, it was confirmed that this bird collision monitoring system shows a 100% bird collision detection rate.

scholarly journals Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7526
Author(s):  
Amrit Shankar Verma ◽  
Nils Petter Vedvik ◽  
Zhen Gao ◽  
Saullo G. P. Castro ◽  
Julie J. E. Teuwen
Keyword(s):  
Wind Turbine ◽  
Damage Tolerance ◽  
Turbine Blades ◽  
Impact Loads ◽  
Wind Turbine Blades ◽  
Failure Loads ◽  
Leading Edges ◽  
Bondline Thickness ◽  
The Impact ◽  
Impact Damages

The leading edges of wind turbine blades are adhesively bonded composite sections that are susceptible to impact loads during offshore installation. The impact loads can cause localized damages at the leading edges that necessitate damage tolerance assessment. However, owing to the complex material combinations together with varying bondline thicknesses along the leading edges, damage tolerance investigation of blades at full scale is challenging and costly. In the current paper, we design a coupon scale test procedure for investigating bondline thickness effects on damage tolerance of joints after being subjected to localized impact damages. Joints with bondline thicknesses (0.6 mm, 1.6 mm, and 2.6 mm) are subjected to varying level of impact energies (5 J, 10 J, and 15 J), and the dominant failure modes are identified together with analysis of impact kinematics. The damaged joints are further tested under tensile lap shear and their failure loads are compared to the intact values. The results show that for a given impact energy, the largest damage area was obtained for the thickest joint. In addition, the joints with the thinnest bondline thicknesses displayed the highest failure loads post impact, and therefore the greatest damage tolerance. For some of the thin joints, mechanical interlocking effects at the bondline interface increased the failure load of the joints by 20%. All in all, the coupon scale tests indicate no significant reduction in failure loads due to impact, hence contributing to the question of acceptable localized damage, i.e., damage tolerance with respect to static strength of the whole blade.

Comparison of Mann Turbulence and atmospheric turbulence as inflow conditions on a wind turbine in large-eddy simulations (LES)

2021 ◽  
Author(s):  
Linus Wrba ◽  
Antonia Englberger
Keyword(s):  
Wind Turbine ◽  
Atmospheric Surface Layer ◽  
Turbine Blades ◽  
Potential Temperature ◽  
Large Eddy Simulations ◽  
Wind Turbine Blades ◽  
Large Eddy ◽  
The Impact ◽  
Inflow Conditions ◽  
Blade Element

<p>This study deals with different inflow conditions on wind-turbines in LES in order to analyse the impact on the wake. The wind turbine regarded in this study has a hub height of 57.19 m while the radius of the blade measures 40m. Furthermore, the blade element momentum method (BEM) is used to calculate the development forces of the wind turbine blades on the flow. First, the syntheticly generated turbulence of a Mann[1] box generator is considered. Second, atmospheric boundary layer simulations from Englberger and Dörnbrack (2018) are applied as inflow conditions for the three wind components and the potential temperature to calculate the wake of the wind turbine. The distribution of turbulent kinetic energy in eddys of different sizes is worked out in their energy spectrum.The inflow conditions represent the -5/3 Kolmogorov spectrum. The wake characteristics are evaluated for both inflow datasets and the arising differences are discussed in this study</p><div><br><div> <p>[1] Mann, J. (1994). The spatial structure of neutral atmospheric surface-layer turbulence. Journal of fluid mechanics 273</p> </div> </div><div><br><div> <p> </p> </div> </div>

scholarly journals Modelling Rain Drop Impact of Offshore Wind Turbine Blades

2012 ◽  
Author(s):  
M. H. Keegan ◽  
D. H. Nash ◽  
M. M. Stack
Keyword(s):  
Wind Turbine ◽  
Impact Damage ◽  
Turbine Blades ◽  
Leading Edge ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wind Turbine Blades ◽  
Erosion Testing ◽  
Software Modelling ◽  
The Impact

The effects of rain and hail erosion and impact damage on the leading edge of offshore wind turbine blades have been investigated. A literature review was conducted to establish the effects of exposure to these conditions and also to investigate the liquid impact phenomena and their implications for leading edge materials. The role of Explicit Dynamics software modelling in simulating impact events was then also established. Initial rain impact modelling is then discussed with the results showing good agreement with theoretical predictions both numerically and with respect to the temporal and spatial development of the impact event. Future development of the rain model and a proposed hail model are then detailed. Planned rain impact and erosion testing work is addressed which will be used to validate, inform and compliment the ongoing modelling efforts.

scholarly journals Dynamic Instability of a Wind Turbine Blade Due to Large Deflections: An Experimental Validation

2020 ◽  
Vol 66 (9) ◽  
pp. 523-533
Author(s):  
Andres Lopez-Lopez ◽  
Jose Billerman Robles-Ocampo ◽  
Perla Yazmin Sevilla-Camacho ◽  
Orlando Lastres-Danguillecourt ◽  
Jesús Muniz ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Experimental Validation ◽  
Dynamic Instability ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Large Deflections ◽  
Wind Turbine Blades ◽  
Non Linear ◽  
Linear Behaviour

Wind turbine blades are designed to be thin and flexible elements. Because unstable dynamic behaviour can affect the life of the rotor, it is crucial to understand the instability of non-linear behaviour caused by large deflections. The present study undertakes both a stability analysis of the non-linear response and an experimental validation of a simplified model for a wind turbine blade based on a cantilever beam. The model is formulated taking into account large geometric deflections and assuming a Galerkin approach. The model is validated experimentally in a wind tunnel with aluminium beams of differing geometry. Analysis of the dynamic response using phase planes reveals that the degree of instability is related to the amplitude of the excitation and the stiffness characteristics.

Effects of Leading-Edge Protection Tape on Wind Turbine Blade Performance

2012 ◽  
Vol 36 (5) ◽  
pp. 525-534 ◽  
Author(s):  
Agrim Sareen ◽  
Chinmay A. Sapre ◽  
Michael S. Selig
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Leading Edge ◽  
Reynolds Numbers ◽  
Lower Surface ◽  
Wind Turbine Blades ◽  
Potential Benefits ◽  
Wind Turbine Airfoil ◽  
Turbine Airfoils ◽  
The Impact

This paper presents results of a study to investigate the impact of using wind protection tape (WPT) to protect the leading edge of wind turbine airfoils from erosion. The tests were conducted on the DU 96-W-180 wind turbine airfoil at three Reynolds numbers between 1 and 1.85 million and angles of attack spanning the low drag range of the airfoil. Tests were run by varying the chordwise extent of the wind protection tape on the upper and lower surface in order to determine the relative impact of each configuration on the aerodynamics of the airfoil. The objective was to assess the performance losses due to the wind protection tape and compare them with losses due to leading-edge erosion in order to determine the potential benefits of using such tape to protect wind turbine blades. Results showed that the application of wind protection tape caused a drag increase of 5–15% for the various configurations tested and was significantly less detrimental to airfoil performance than leading edge erosion that could otherwise occur.

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