scholarly journals Virtual full-scale testing for investigating strength characteristics of a composite wind turbine blade

2020 ◽  
Author(s):  
Can Muyan ◽  
Demirkan Coker
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Mechanical Response ◽  
Leading Edge ◽  
Full Scale ◽  
Wind Turbine Blade ◽  
Combined Loading ◽  
Strength Analysis ◽  
Damage Development ◽  
Extreme Load

Abstract. Full-scale structural tests enable us to monitor mechanical response of the blades under various loading scenarios. Yet these tests must be accompanied with numerical simulations, so that the physical basis of the progressive damage development can be captured and interpreted correctly. Within the scope of this paper the previous work of the authors concerning the strength analysis of an existing 5-m GFRP wind turbine blade using Puck failure criteria is revisited. An important outcome of the previous study was that nonlinear Puck material model was found to be necessary for a more realistic simulation of failure mechanisms. In the current work, under extreme load cases internal flange at the leading edge, trailing edge of the blade are identified as the mainly damaged regions. Moreover, dominant failure mechanism is expected to be the de-bonding at the trailing and leading edges. When extreme load case is applied as a combination of edge-wise and flap-wise loading cases, less damage is observed compared to the pure flap-wise loading case. This damage evolution is attributed to the stiffer structural behavior of the blade under combined loading condition.

scholarly journals Finite element simulations for investigating the strength characteristics of a 5 m composite wind turbine blade

2020 ◽  
Vol 5 (4) ◽  
pp. 1339-1358
Author(s):  
Can Muyan ◽  
Demirkan Coker
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Mechanical Response ◽  
Leading Edge ◽  
Wind Turbine Blade ◽  
Strength Characteristics ◽  
Progressive Damage ◽  
Damage Development ◽  
Extreme Load

Abstract. Full-scale structural tests enable us to monitor the mechanical response of the blades under various loading scenarios. Yet, these tests must be accompanied by numerical simulations so that the physical basis of the progressive damage development can be better interpreted and understood. In this work, finite element analysis is utilized to investigate the strength characteristics of an existing 5 m RÜZGEM composite wind turbine blade under extreme flapwise, edgewise and combined flapwise plus edgewise loading conditions. For this purpose, in addition to a linear buckling analysis, Puck's (2D) physically based phenomenological model is used for the progressive damage analysis of the blade. The 5 m RÜZGEM blade is found to exhibit sufficient resistance against buckling. However, Puck's damage model indicates that laminate failure plays a major role in the ultimate blade failure. Under extreme flapwise and combined load cases, the internal flange at the leading edge and the trailing edge are identified as the main damaged regions. Under edgewise loading, the leading edge close to the root is the failure region. When extreme load case is applied as a combination of edgewise and flapwise loading cases, less damage is observed compared to the pure flapwise loading case.

Experimental investigation of the effect of active flow control on the wake of a wind turbine blade

2021 ◽  
pp. 095440622110089
Author(s):  
GholamHossein Maleki ◽  
Ali Reza Davari ◽  
Mohammad Reza Soltani
Keyword(s):  
Experimental Investigation ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Active Flow Control ◽  
Leading Edge ◽  
Wind Turbine Blade ◽  
Plasma Actuators ◽  
Plasma Actuation ◽  
Surface Pressure Distribution ◽  
Stall Angle

An extensive experimental investigation was conducted to study the effects of Dielectric Barrier Discharge (DBD), on the flow field of an airfoil at low Reynolds number. The DBD was mounted near the leading edge of a section of a wind turbine blade. It is believed that DBD can postpone the separation point on the airfoil by injecting momentum to the flow. The effects of steady actuations on the velocity profiles in the wake region have been investigated. The tests were performed at α = 4 to 36 degrees i.e. from low to deep stall angles of attack regions. Both surface pressure distribution and wake profile show remarkable improvement at high angles of attack, beyond the static stall angle of the airfoil when the plasma actuation was implemented. The drag calculated from the wake momentum deficit has further shown the favorable role of the plasma actuators to control the flow over the airfoil at incidences beyond the static stall angle of attack of this airfoil. The results demonstrated that DBD has been able to postpone the stall onset significantly. It has been observed that the best performance for the plasma actuation for this airfoil is in the deep stall angles of attack range. However, below and near the static stall angles of attack, plasma augmentation was pointed out to have a negligible improvement in the aerodynamic behavior.

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.

A method of determining test load for full-scale wind turbine blade fatigue tests

2018 ◽  
Vol 32 (11) ◽  
pp. 5097-5104 ◽  
Author(s):  
Qiang Ma ◽  
Zong-Wen An ◽  
Jian-Xiong Gao ◽  
Hai-Xia Kou ◽  
Xue-Zong Bai
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Fatigue Tests ◽  
Full Scale ◽  
Wind Turbine Blade ◽  
Test Load

Research on Wind Turbine Blade Loads and Dynamics Factors

2014 ◽  
Vol 1014 ◽  
pp. 124-127
Author(s):  
Zhi Qiang Xu ◽  
Jian Huang
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbines ◽  
Mechanical Energy ◽  
Turbine Blades ◽  
Electrical Energy ◽  
Wind Turbine Blade ◽  
Strength Analysis ◽  
Wind Turbine Blades ◽  
Turbine Wheel

Wind turbines consists of three key parts, namely, wind wheels (including blades, hub, etc.), cabin (including gearboxes, motors, controls, etc.) and the tower and Foundation. Wind turbine wheel is the most important part ,which is made up of blades and hubs. Blade has a good aerodynamic shape, which will produce aerodynamic in the airflow rotation, converting wind energy into mechanical energy, and then, driving the generator into electrical energy by gearbox pace. Wind turbine operates in the natural environment, their load wind turbine blades are more complex. Therefore load calculations and strength analysis for wind turbine design is very important. Wind turbine blades are core components of wind turbines, so understanding of their loads and dynamics by which the load on the wind turbine blade design is of great significance.

Structural failure test of a 52.5 m wind turbine blade under combined loading

2019 ◽  
Vol 103 ◽  
pp. 286-293 ◽  
Author(s):  
Lei'an Zhang ◽  
Yanzhen Guo ◽  
Jinghua Wang ◽  
Xuemei Huang ◽  
Xiuting Wei ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Combined Loading ◽  
Structural Failure
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