scholarly journals Damage mechanism of wind turbine blade under the impact of lightning induced arcs

2019 ◽  
Vol 11 (5) ◽  
pp. 053306
Author(s):  
Minhao Zhang ◽  
Qingmin Li ◽  
Hongbo Li ◽  
Wanshui Yu ◽  
Zixin Guo ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Damage Mechanism ◽  
Wind Turbine Blade ◽  
The Impact

Wind Turbine Blade Coating Fatigue Induced by Raindrop Impact

2020 ◽  
Author(s):  
Weifei Hu ◽  
Weiyi Chen ◽  
Xiaobo Wang ◽  
Zhenyu Liu ◽  
Jianrong Tan ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Crack Growth ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Rain Event ◽  
Rain Intensity ◽  
Texture Model ◽  
The Impact ◽  
Blade Coating ◽  
Raindrop Impact

Abstract With the increase of wind energy production demand, the need to manufacture larger wind turbine blades is on the rise. Because of the high tip speed of the large blade, the blade could be impacted by high-speed objects such as raindrops. This research focuses on developing a computational model for analyzing wind turbine blade coating fatigue induced by raindrop impact. A stochastic rain texture model is used to simulate a realistic rain event determined by a rain intensity and a rain duration. A smoothed particle hydrodynamic approach is implemented to calculate the impact stress considering a single raindrop. A stress interpolation method is proposed to accurately and efficiently estimate the impact of stress under a random rain event. Besides, a crack growth law is used to explain the process of coating shedding. Through a method for calculating crack growth length based on stress, this paper analyzes crack growth life as a function of the rain intensity and the rain duration. This function, together with the statistics of rainfall history, provides a new approach for estimating the expected fatigue life of the blade coating.

Experimental and Numerical Investigation of Inflow Turbulence on the Performance of Wind Turbine Airfoils

2013 ◽  
Author(s):  
O. Eisele ◽  
G. Pechlivanoglou ◽  
C. N. Nayeri ◽  
C. O. Paschereit
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Tunnel Test ◽  
Wind Turbine Blade ◽  
Two Dimensional ◽  
Airfoil Surface ◽  
Wind Tunnel Measurements ◽  
Inflow Turbulence ◽  
The Impact

Wind turbine blade design is currently based on the combination of a plurality of airfoil sections along the rotorblade span. The two-dimensional airfoil characteristics are usually measured with wind tunnel experiments or computed by means of numerical simulation codes. The general airfoil input for the calculation of the rotorblade power characteristics as well as the subsequent aerodynamic and aeroelastic loads are based on these two-dimensional airfoil characteristics. In this paper, the effects of inflow turbulence and wind tunnel test measurement deviations are investigated and discussed, to allow considerations of such effects in the rotorblade design process. The results of CFD simulations with various turbulence models are utilized in combination with wind tunnel measurements in order to assess the impact of such discrepancies. It seems that turbulence, airfoil surface roughness and early transition effects are able to contribute significantly to the uncertainty and scattering of measurements. Various wind tunnel facilities generate different performance characteristic curves, while grid-generated turbulence is generally not included in the wind tunnel measurements during airfoil characterization. Furthermore the correlation of grid-generated wind tunnel turbulence with the atmospheric turbulence time and length scales is not easily achieved. All the aforementioned uncertainties can increase the performance scattering of current wind turbine blade designs as well as the generated aeroelastic loads. A brief assessment of the effect of such uncertainties on wind turbine performance is given at the last part of this work by means of BEM simulations on a wind turbine blade.

scholarly journals Numerical Simulation of the Impact ofIce Accumulation on a Composite Wind Turbine Blades located in a Cold Climate

2021 ◽  
Vol 229 ◽  
pp. 01052
Author(s):  
O. Lagdani ◽  
M. Tarfaoui ◽  
M. Nachtane ◽  
M. Trihi ◽  
H. Laaouidi
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Carbon Fibers ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Cold Climate ◽  
Horizontal Wind ◽  
The Finite Element Method ◽  
Wind Turbine Blades ◽  
The Impact

The blades of wind turbines placed in cold climate regions are exposed to the risk of icing phenomena which impact their lifetimes. This paper proposes a numerical model to simulate 50 mm ice thickness localized on the tip side of a horizontal wind turbine blade, and to study its mechanical behavior. The wind turbine blade wasmodeled with the finite element method (FEM)in ABAQUS software taking into account aerodynamic, centrifugal and inertial loads under the conditions of service of the blade.Numerical tests haveevaluated the behavior of different composite materials and compared with each other. Damage mode based on the Hashin criteria was defined. Carbon fibers were considered to be the most rigid material which results in thinner, stiffer and lighter blades.

scholarly journals Research sized wind turbine blade modal tests: comparison of the impact excitation with shaker excitation

2018 ◽  
Vol 1102 ◽  
pp. 012022 ◽  
Author(s):  
M. M. Luczak ◽  
B. Peeters ◽  
S. Manzato ◽  
E. Di Lorenzo ◽  
K. Reck-Nielsen ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Impact Excitation ◽  
The Impact

The impact of yaw error on aeroelastic characteristics of a horizontal axis wind turbine blade

2013 ◽  
Vol 60 ◽  
pp. 256-268 ◽  
Author(s):  
Min-Soo Jeong ◽  
Sang-Woo Kim ◽  
In Lee ◽  
Seung-Jae Yoo ◽  
K.C. Park
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
The Impact

Study on Natural Vibration Characteristics of Large Scale Composite Wind Turbine Blades

2011 ◽  
Author(s):  
Yi Yang ◽  
Chengcheng Tan ◽  
Danmei Xie ◽  
Yangheng Xiong ◽  
Yang Shi ◽  
...  
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Torsional Vibration ◽  
Crack Depth ◽  
Wind Turbine Blade ◽  
Variable Cross ◽  
Crack Location ◽  
The Impact

As the single unit capacity has been increased, the length of wind turbine blade is becoming longer, and the blade vibration fatigue damage caused by impact of wind turbines has become an important issue of wind turbine security. Therefore, modal analysis and study on the impact of crack on the natural frequency of the wind turbine blade are of great significance. The finite element software ANSYS was used to establish a finite element model of a 1.5MW composite wind turbine blade, with a structure of twisted variable cross-section and hollow core in the first place of this paper. Modal analysis of the model established in this paper showed that the blade vibrates in 3 different forms, they are flap within the rotating plane, flutter vibration perpendicularity to the rotating plane and torsional vibration around the blade shaft. Among all the orders, flap and flutter vibration are predominent in low modes, while torsional vibration appears only in high modes (above the fifth order). Then blade models with cracks in the root were established to analyze the regularity of the blade natural frequencies with the crack location, depth and the variation of the angle. The results showed that: as the location of the crack changed in wingspan direction, the change of frequencies showed two basic trends: one was declining gradually; the other was decreasing and then increasing before decreasing again, and the minimum the maximum value appeared at location around 32.5% and 87.5% of the blade root respectively. As crack depth increased gradually, the frequencies reduced continuously, and compared to crack location, influence of crack depth was more prominent. For slant crack, when the crack angle, that is the angle between the crack section chord line and the foliosine plane, increased, all orders of frequencies gradually increased, indicating that the influence of the crack on the blade stiffness decreases as the angle increases.

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