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M
mdpi.com
article
https://www.mdpi.com/1996-1073/18/5/1195
Aerodynamic and Vibration Characteristics of Iced Power Transmission Conductors in a Nonuniform Wind Field Based on Unsteady Theory. permission is required to reuse all or part of the article published by MDPI, including figures and tables. This paper investigates the aeroelastic behaviour of a full wind turbine model with realistic blade vibration amplitude (9% span) using a nonlinear frequency-domain solution method. The primary objective is to demonstrate the computational efficiency of this method for an aeroelastic analysis compared to resource-intensive time-domain approaches. The frequency-domain method was then validated against a conventional time-domain method, comparing aerodynamic damping and unsteady pressure distributions, with strong agreement observed. Results show a more complex unsteady pressure distribution at 324.5 RPM compared to 424.5 RPM, directly affecting aerodynamic damping. Aeroelastic analyses of a wind turbine with a relatively large amplitude blade structural oscillation at different rotational speeds are performed using the nonlinear frequency-domain method in this paper.
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c3.ndc.nasa.gov
official
https://c3.ndc.nasa.gov/dashlink/static/media/other/RTO-2008-Aeroelastic_Anal…
This higher level of structural and aerodynamic modeling is Aeroelastic Analysis by Coupled Non-linear Time Domain Simulation 24 - 2 RTO-MP-AVT-154 especially required if in transonic and viscous or even separated flow complex shock motions, limit cycle oscillations (LCO) or large deflections occur. Figure 13: CFD and FE models of the A340-300 configuration The advantages of the modal approach are: • For the structure n eigenmodes and eigenvalues have to be computed only once (MSC Nastran Aeroelastic Analysis by Coupled Non-linear Time Domain Simulation RTO-MP-AVT-154 24 - 13 SOL 103) • Only these eigenmodes have to be interpolated to the CFD surface. TRANSONIC DIP AND LIMIT CYCLE OSCILLATIONS OF THE NLR7301 AIRFOIL Wind tunnel data from DLR tests [14][15] for the supercritical NLR7301 airfoil are applied for assessment of unsteady aerodynamics in separated flow (buffet) and of fluid-structure coupling tools, for nonlinear Aeroelastic Analysis by Coupled Non-linear Time Domain Simulation RTO-MP-AVT-154 24 - 15 transonic flutter (LCO).
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publications.rwth-aachen.de
article
http://publications.rwth-aachen.de/record/849650/files/849650.pdf
Rotation speed of the wake Inflow angle Rotor azimuth angle ij Stress tensor Sij Strain-rate tensor Blade pitch angle ˘1 Free stream velocity Acronyms Abbreviation Description ACM Aeroelastic Coupling Module ALE Arbitrary Lagrangian/Eulerian BCS Blade Coordinate System BEMT Blade Element Momentum Theory BRICS Brazil, Russia, India, China and South Africa BSR Block Sparse Row CFD Computational Fluid Dynamics xi Abbreviation Description CSM Computational Structural Mechanics DNS Direct Numerical Simulation DOWEC Dutch Offshore Wind Energy Converter DSD/SST Deforming Spatial Domain/Stabilized Space-Time EMUM Elastic Mesh Update Method EIA Energy Information Administration EU The European Union EWEA The European Wind Energy Association FAST Fatigue, Aerodynamics, Structures, and Turbulence FIE Finite Interpolation Elements FSI Fluid Structure Interaction GCS Global Coordinate System GLS Galerkin/Least-Squares GMRES Generalized Minimum Residual HAWT Horizontal Axis Wind Turbine LBB Ladyzhenskaya-Babuška-Brezzi LCOE Levelized Cost of Electricity LES Large Eddy Simulation NASA National Aeronautics and Space Administration NREL National Renewable Energy Laboratory PSPG Pressure-stabilizing/Petrov-Galerkin RANS Reynolds-averaged Navier-Stokes RCS Rotor Coordinate System ROM Reduced Order Model SGS Subgrid Scale SISO Single-input/Single-output SSMUM Shear-slip Mesh Update Method UAE Unsteady Aerodynamics Experiment URANS Unsteady Reynolds-averaged Navier-Stokes xii List of Figures 1.
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repository.tno.nl
article
https://repository.tno.nl/SingleDoc?docId=36540
logo TNO innovation for life. # Aero-elastic simulation of offshore wind turbines in the frequency domain. ## This is what we're working on. ## Newsroom. ## About TNO. ## Technology and science. ## Collaboration. ## Make TNO yours!
S
sciencedirect.com
article
https://www.sciencedirect.com/science/article/abs/pii/S0167610516300435
Aeroelastic analysis of a full scale composite wind turbine blade is investigated using its 3D model. Aerodynamic loading is determined using modified Blade
D
diva-portal.org
article
https://www.diva-portal.org/smash/get/diva2:7492/FULLTEXT02.pdf
82 viii Paper 1: Aeroelastic FE modelling of wind turbine dynamics 89 Paper 2: Emergency stop simulation using a FEM model developed for large blade deflections 115 Paper 3: Influence of wind turbine flexibility on loads and power production 141 ix List of symbols a′ tangential induction factor, 23 α angle of attack, 23 c blade cord length, 22 CD drag coefficient, 22 CL lift coefficient, 22 CN projected drag coefficient, 23 c(r) chord at position r, 24 CT projected lift coefficient, 23 D drag force, 23 FN force normal to rotor plane, 23 FT force tangential to rotor plane, 23 L lift force, 22 N number of blades, 24 ω rotation speed, 23 φ angle between disc plane and relative velocity, 23 r radius of the blade, 23 σ solidify factor, 24 θ local pitch of the blade, 23 U∞ undisturbed air speed, 23 Vrel relative air speed, 22 xi List of Figures 2.1 The 1.250 MW Smith-Putnam wind turbine.
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wes.copernicus.org
article
https://wes.copernicus.org/preprints/wes-2022-91/wes-2022-91.pdf
Aeroelastic Validation of the Offshore Wind Energy Simulator for Vertical-Axis Wind Turbines Kevin R. Differences between vertical and horizontal turbines necessitates several key additions in modeling, including the aerodynamic model, as well as solving a fundamentally different structural 5 mesh. This paper presents validation cases of this tool for modal, centrifugal, gravitational, startup, normal operation, and shutdown analyses. The aeroelastic validation is performed with increasing complexity from analytical test cases to an experimental VAWT. Differing cost relationships for floating offshore wind energy and distributed wind systems relative to land-based utility wind systems can favor VAWT *Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525 1 https://doi.org/10.5194/wes-2022-91 Preprint. Specifically, this paper will review the aeroelastic code, present the experimental validation data, and show simulation comparisons against a series of analytical cases and several experimental tests from the Sandia 34 meter turbine.
J
jafmonline.net
article
https://www.jafmonline.net/article_2696_dc2b690516158a874dd8aabe1365c6a0.pdf
https://doi.org/10.47176/jafm.18.8.3259 2122 Aeroelastic Analysis of a Wind Turbine with a Bamboo Honeycomb Structural Web T. To prevent blade damage due to vibration and improve the aeroelastic stability of wind turbine blades, this paper proposes a bionic blade with a bionic web inspired by bamboo and honeycomb structures. In addition, the integration of bamboo and honeycomb structures into the bionic design offers an innovative approach to wind turbine blade engineering. A numerical simulation of wind turbine operation was conducted, comparing the deformation, stress–strain response, modal analysis, and harmonic response of the original and bionic blades. 2.2.2 Bionic Blade In this study, bamboo and honeycomb are selected as the original biomimetic prototypes for the web structure of wind turbines. The bamboo honeycomb web effectively reduces stress values, enhancing the safe operation of the wind turbine blade. 4. CONCLUSION In response to the demand for enhanced structural performance in large-scale wind turbines, this paper proposes a bionic wind turbine blade that leverages the functional similarities between web plate structures and bamboo.