scholarly journals Low-Reynolds-number investigations on the ability of the strip of e-TellTale sensor to detect the flow features over wind turbine blade section: flow stall and reattachment dynamics

2021 ◽  
Vol 6 (2) ◽  
pp. 409-426
Author(s):  
Antoine Soulier ◽  
Caroline Braud ◽  
Dimitri Voisin ◽  
Bérengère Podvin
Keyword(s):  
Velocity Field ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Time Resolved ◽  
Measured Velocity ◽  
Piv Measurements ◽  
Image Velocimetry ◽  
Flow Features ◽  
Blade Section

Abstract. Monitoring the flow features over wind turbine blades is a challenging task that has become more and more crucial. This paper is devoted to demonstrate the ability of the e-TellTale sensor to detect the flow stall–reattachment dynamics over wind turbine blades. This sensor is made of a strip with a strain gauge sensor at its base. The velocity field was acquired using time-resolved particle image velocimetry (TR-PIV) measurements over an oscillating 2D blade section equipped with an e-TellTale sensor. PIV images were post-processed to detect movements of the strip, which was compared to movements of flow. Results show good agreement between the measured velocity field and movements of the strip regarding the stall–reattachment dynamics.

scholarly journals Ability of the e-TellTale sensor to detect flow features over wind turbine blades: flow stall/reattachment dynamics

2020 ◽  
Author(s):  
Antoine Soulier ◽  
Caroline Braud ◽  
Dimitri Voisin ◽  
Bérengère Podvin
Keyword(s):  
Velocity Field ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Measured Velocity ◽  
Piv Measurements ◽  
Flow Features ◽  
Blade Section ◽  
Strain Gauge Sensor ◽  
Good Agreement

Abstract. Monitoring the flow features over wind turbine blades is a challenging task that has become more and more crucial. This paper is devoted to demonstrate the ability of the e-TellTale sensor to detect the flow stall/reattachment dynamics over wind turbine blades. This sensor is made of a strip with a strain gauge sensor at its base. The velocity field was acquired using TR-PIV measurements over an oscillating 2D blade section equipped with an e-TellTale sensor. PIV images were post-processed to detect movements of the strip, which was compared to movements of flow. Results show good agreement between the measured velocity field and movements of the strip regarding the stall/reattachment dynamics.

On the Use of Velocity Data for Load Estimation of a VAWT in Dynamic Stall

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
Carlos J. Simão Ferreira ◽  
Gerard J. W. van Bussel ◽  
Gijs A. M. van Kuik ◽  
Fulvio Scarano
Keyword(s):  
Velocity Field ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Pressure Sensors ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Velocity Data ◽  
Vertical Axis Wind Turbine ◽  
Wind Turbine Blades ◽  
Image Velocimetry

This paper focuses on evaluating the feasibility of estimating loads on vertical axis wind turbine blades in dynamic stall with velocity data acquired with Particle Image Velocimetry. The study uses numerical simulation data of a 2D Vertical Axis Wind Turbine in dynamic stall to verify sources of error and uncertainty and estimate the accuracy of the method. The integration of the forces from the velocity field overcomes the difficulties and limitations presented by pressure sensors for estimating the local section loads, but adds the difficulty in determining the correct velocity field and its time and spatial derivatives. The analysis also evaluates the use of phase-locked average data as an estimator of average loads.

scholarly journals Detailed Analysis of the Blade Root Flow of a Horizontal Axis Wind Turbine

2016 ◽  
Author(s):  
I. Herráez ◽  
B. Akay ◽  
G. J. W. van Bussel ◽  
J. Peinke ◽  
B. Stoevesandt
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Navier Stokes ◽  
Wind Turbine Blades ◽  
Force Coefficient ◽  
Horizontal Axis Wind Turbine ◽  
Physical Mechanisms ◽  
Blade Root ◽  
Root Region ◽  
Image Velocimetry

Abstract. The root flow of wind turbine blades is subjected to complex physical mechanisms that influence significantly the rotor aerodynamic performance. Spanwise flows, the Himmelskamp effect and the formation of the root vortex are examples of interrelated aerodynamic phenomena observed in the blade root region. In this study we address those phenomena by means of Particle Image Velocimetry (PIV) measurements and Reynolds Averaged Navier–Stokes (RANS) simulations. The numerical results obtained in this study are in very good agreement with the experiments and unveil the details of the intricate root flow. The Himmelskamp effect is shown to delay the stall onset and enhance the lift force coefficient Cl even at a moderate angle of attack (AoA ≈ 13°). The results also show that the vortex emanating from the spanwise position of maximum chord length rotates in the opposite direction of the root vortex, what affects the wake evolution.

A Numerical Study of Wind Turbine Airfoil Combined Oscillations Considering Phase Difference under Yaw Loads

2020 ◽  
Author(s):  
Yufeng Yin ◽  
Zhengjie Ji ◽  
Jin Zhang ◽  
Xuan Yin ◽  
Yijie Feng ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Phase Difference ◽  
Numerical Study ◽  
Turbine Blades ◽  
Aerodynamic Performance ◽  
Operating Efficiency ◽  
Wind Turbine Blades ◽  
Pitching Motion ◽  
Blade Section ◽  
Wind Turbine Airfoil

Abstract In order to further improve the operating efficiency of wind turbines and explore the aerodynamic performance of the complex motion of wind turbine blades under yaw loads. In this study, the change in the angle of attack of the blade section airfoil under yaw load can be modeled as an oscillating airfoil and combined with the blade's flapwise motion. The NREL S809 airfoil are chosen for the research, based on the SST k-ω turbulence model with transition correction, under the condition of Reynolds number of 10 6 . The effect of phase difference on its aerodynamic performance under combined flapwise and pitching motion in various flapwise amplitudes and working conditions were analyzed. For the combined oscillations, the effects of the flapwise amplitude ( h ) in the range of 0.2≤ h ≤0.5 are investigated with the phase differences of Φ=±3π/4, ±π/2, ±π/4, 0. The results show that the phase difference between the pitching motion and the flapping motion and the different flapping amplitudes can have a large impact on the aerodynamic performance of the airfoil during dynamic stall, but the degree of influence is greatly different in different situations.

Transient atmospheric ice accretion on wind turbine blades

2018 ◽  
Vol 42 (6) ◽  
pp. 596-606
Author(s):  
Galal M Ibrahim ◽  
Kevin Pope ◽  
Yuri S Muzychka
Keyword(s):  
Wind Turbine ◽  
Water Content ◽  
Liquid Water ◽  
Turbine Blades ◽  
Liquid Water Content ◽  
Single Shot ◽  
Ice Accretion ◽  
Wind Turbine Blades ◽  
Median Volume ◽  
Blade Section

This article aims to predict ice loads on a wind turbine blade section at 80% of blade span, using FENSAP ICE. Using low and high liquid water content conditions of stratiform and cumuliform clouds, different icing events are simulated. Ice accretion predictions with single-shot and multi-shot approaches are presented. Blade surface roughness is also investigated, as well as the relationships between ice mass, liquid water content, median volume diameter, and temperature.

scholarly journals Research on the Parametric Modelling Approach of Vortex Generator on Wind Turbine Airfoil

2021 ◽  
Vol 9 ◽  
Author(s):  
Ming Chen ◽  
Zhenzhou Zhao ◽  
Huiwen Liu ◽  
Tongguang Wang ◽  
Lingyu Meng ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Pressure Coefficient ◽  
Turbine Blades ◽  
Vortex Generator ◽  
Parametric Model ◽  
Parametric Models ◽  
Parametric Modelling ◽  
Wind Turbine Blades ◽  
Blade Section ◽  
Research Efficiency

Counter-rotating vortex generators (VGs) are typically employed to delay airflow separation on wind turbine blades. Large-size wind turbine blades equipped with small size VGs make the computational fluid dynamics (CFD) researches require a great deal of computational resources. Parametric models of VGs can effectively improve the numerical research efficiency of wind turbine blades with VGs. In order to improve the accuracy of such parametric models, this study proposed a series of modeling approaches to determine the positions of the adding source term in Cartesian coordinates, the VG vortex core radius, etc., on the wind turbine airfoils. These techniques are integrated with a maximum circulation algorithm by considering the interactions between VG pairs to predict the performance of a DU91-W2-250 blade section with VGs. The proposed parametric model and an entity model at different angles of attack (AoAs) are implemented on the blade section. Our approach is validated using experimental data. Comparisons demonstrate a strong agreement between the modelled and experimental results, proving the high accuracy of the two models. The numerical results of the models are then compared and analyzed at different incoming flow velocities and AoAs to verify the universality of the proposed parametric approaches. The results reveal a high consistency between the vortex structure, the velocity profile above the blade surface and the distribution of the pressure coefficient calculated by the two models. This proves the high universality of the proposed approaches and demonstrates the potential of the parametric model in replacing the VG entity model. The VG parametric model expresses VG parameters by program, which can improve the research efficiency of VG arrangement on wind turbine blades.

scholarly journals Extraction of the wake induction and angle of attack on rotating wind turbine blades from PIV and CFD results

2018 ◽  
Vol 3 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Iván Herráez ◽  
Elia Daniele ◽  
J. Gerard Schepers
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Angle Of Attack ◽  
Accurate Information ◽  
Wind Turbine Blades ◽  
Cfd Simulations ◽  
Data Set ◽  
Wind Turbine Aerodynamics ◽  
Image Velocimetry ◽  
Computational Fluid Dynamics Cfd

Abstract. The analysis of wind turbine aerodynamics requires accurate information about the axial and tangential wake induction as well as the local angle of attack along the blades. In this work we present a new method for obtaining them conveniently from the velocity field. We apply the method to the New Mexico particle image velocimetry (PIV) data set and to computational fluid dynamics (CFD) simulations of the same turbine. This allows the comparison of experimental and numerical results of the mentioned quantities on a rotating wind turbine. The presented results open up new possibilities for the validation of numerical rotor models.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
Sign in / Sign up

Export Citation Format

Share Document