Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis

2019 ◽  
Vol 214 ◽  
pp. 422-438 ◽  
Author(s):  
Xiao Chen ◽  
Peter Berring ◽  
Steen Hjelm Madsen ◽  
Kim Branner ◽  
Sergei Semenov
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Progressive Failure ◽  
Failure Mechanisms ◽  
Fe Analysis ◽  
Wind Turbine Blade ◽  
Trailing Edge ◽  
Nonlinear Fe Analysis ◽  
Edge Section

Three-Dimensional and Rotational Aerodynamics on the NREL Phase VI Wind Turbine Blade

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Alvaro Gonzalez ◽  
Xabier Munduate
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Three Dimensional ◽  
Separated Flow ◽  
Leading Edge ◽  
Wind Turbine Blade ◽  
Trailing Edge ◽  
Rotating Blade ◽  
Nrel Phase Vi ◽  
Edge Separation

This work undertakes an aerodynamic analysis over the parked and the rotating NREL Phase VI wind turbine blade. The experimental sequences from NASA Ames wind tunnel selected for this study respond to the parked blade and the rotating configuration, both for the upwind, two-bladed wind turbine operating at nonyawed conditions. The objective is to bring some light into the nature of the flow field and especially the type of stall behavior observed when 2D aerofoil steady measurements are compared to the parked blade and the latter to the rotating one. From averaged pressure coefficients together with their standard deviation values, trailing and leading edge separated flow regions have been found, with the limitations of the repeatability of the flow encountered on the blade. Results for the parked blade show the progressive delay from tip to root of the trailing edge separation process, with respect to the 2D profile, and also reveal a local region of leading edge separated flow or bubble at the inner, 30% and 47% of the blade. For the rotating blade, results at inboard 30% and 47% stations show a dramatic suppression of the trailing edge separation, and the development of a leading edge separation structure connected with the extra lift.

Prediction of wind turbine blade trailing edge noise under various flow conditions for a passive damage detection system

2021 ◽  
Vol 263 (2) ◽  
pp. 4079-4087
Author(s):  
Murat Inalpolat ◽  
Caleb Traylor
Keyword(s):  
Structural Health Monitoring ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Health Monitoring ◽  
Detection System ◽  
Wind Turbine Blade ◽  
Flow Conditions ◽  
Trailing Edge ◽  
Structural Health ◽  
Acoustic Spectra

Noise generated by turbulent boundary layer over the trailing edge of a wind turbine blade under various flow conditions is predicted and analyzed for structural health monitoring purposes. Wind turbine blade monitoring presents a challenge to wind farm operators, and an in-blade structural health monitoring system would significantly reduce O&M costs. Previous studies into structural health monitoring of blades have demonstrated the feasibility of designing a passive detection system based on monitoring the flow-generated acoustic spectra. A beneficial next step is identifying the robustness of such a system to wind turbine blades under different flow conditions. To examine this, a range of free stream air velocities from 5 m/s to 20 m/s and a range of rotor speeds from 5 rpm to 20 rpm are used in a reduced-order model of the flow-generated sound in the trailing edge turbulent boundary layer. The equivalent lumped acoustics sources are predicted based on the turbulent flow simulations, and acoustic spectra are calculated using acoustic ray tracing. Each case is evaluated based on the changes detected when damage is present. These results can be used to identify wind farms that would most benefit from this monitoring system to increase efficiency in deployment of turbines.

scholarly journals Numerical Study of Darrieus Wind Turbine Blade Characteristic with Shape Changes of Trailing Edge

2020 ◽  
pp. 1088-1096
Author(s):  
Viktus Kolo Koten ◽  
Syukri Himran ◽  
Nasaruddin Salam ◽  
Luther Sule
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Numerical Study ◽  
Wind Turbine Blade ◽  
Trailing Edge ◽  
Shape Changes

Failure Mode Estimation with Inter-Fiber Failure Analysis of Composite Wind Turbine Blade

2011 ◽  
Vol 109 ◽  
pp. 84-88
Author(s):  
Soo Hyun Kim ◽  
Hyung Joon Bang
Keyword(s):  
Composite Materials ◽  
Wind Turbine ◽  
Failure Mode ◽  
Turbine Blade ◽  
Fe Analysis ◽  
Wind Turbine Blade ◽  
Analysis Model ◽  
Fiber Failure ◽  
Static Test ◽  
Mode Estimation

This paper provides an overview of the failure mode estimation result with 3D finite element (FE) analysis model of wind turbine blade. In order to predict the realistic behavior in the whole blade region, fiber failure (FF) and inter-fiber failure (IFF) analysis were applied to account delamination or matrix failure on composite materials. The Puck’s fracture criteria were used for the IFF evaluation. For the comparison of FE analysis result with the measured data of static test, a 3.5m down-scaled wind turbine blade was designed and fabricated using glass fiber epoxy composite materials. A nonlinear static structural analysis was performed and then the failure mode and the location were estimated with the FF and IFF analysis.

Frequency-Weighted Model Predictive Control of Trailing Edge Flaps on a Wind Turbine Blade

2013 ◽  
Vol 21 (4) ◽  
pp. 1105-1116 ◽  
Author(s):  
Damien Castaignet ◽  
Ian Couchman ◽  
Niels Kjolstad Poulsen ◽  
Thomas Buhl ◽  
Jens Jakob Wedel-Heinen
Keyword(s):  
Model Predictive Control ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Predictive Control ◽  
Wind Turbine Blade ◽  
Trailing Edge ◽  
Trailing Edge Flaps ◽  
Weighted Model

Fatigue Failure of a Composite Wind Turbine Blade at the Trailing Edge

2018 ◽  
Vol 382 ◽  
pp. 191-195 ◽  
Author(s):  
Zu Jin Pan ◽  
Jian Zhong Wu ◽  
Jian Liu ◽  
Xin Hua Zhao
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Failure Modes ◽  
Fatigue Testing ◽  
Turbine Blades ◽  
Local Stress ◽  
Wind Turbine Blade ◽  
Trailing Edge ◽  
Balsa Wood ◽  
Abnormal Sound

The downtime problem of wind turbine increases due to fatigue damage of wind turbine blades, which is even more crucial in the larger blades. One of the critical failure modes is the blade trailing edge failure, which can result in the trailing edge joint cracked. In this paper, we experienced that abnormal sound was happened in the trailing edge at the cross-section in the max chord during fatigue testing of a 2 MW full-scale wind turbine blade according to IEC61400-23. Through the conditional monitoring of the trailing edge, the delamination between GFRP and balsa wood is caused by stress concentration. The abnormal sound is happened due to GFRP beat the balsa wood when the blade vibrates in the edgewise direction. Moreover, the sound is amplified because the introduction of air due to the delamination. The local stress distribution and stability factors are computed through FEM methods, the program that increasing the core materials in the trailing edge is proposed. Therefore the structure reliability in the trailing edge is improved.

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