Aerodynamic performance of wind turbines. Final report

Wilson, Robert E.; Lissaman, P. B. S.; Walker, S.N.

doi:10.2172/7315651

Cited by 120 publications

(60 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is of great importance to develop advanced tools to predict and improve wind turbine performance in order to capture the energy more efficiently from the wind. Today, designers of wind turbines have a large number of different aerodynamic predictive tools to their disposal, including blade element momentum based methods, fixed/free vortex wake models, actuator disk/line/surface models and full Navier–Stokes methods. However, the validity and range of applicability of the various methods are still not fully settled.…”

Section: Introductionmentioning

confidence: 99%

Actuator line/Navier–Stokes computations for the MEXICO rotor: comparison with detailed measurements

2011

View full text Add to dashboard Cite

In the European collaborative MEXICO (Model Experiments in Controlled Conditions) project, a series of experiments was carried out on a 4.5 m diameter wind turbine rotor to validate numerical diagnostics tools. Here, some of the measured data are compared with computations of the combined actuator line/Navier-Stokes (AL/NS) model developed at the Technical University of Denmark. The AL/NS model was combined with a large eddy simulation technique and used to compute the flow past the MEXICO rotor in free air and in the DNW German-Dutch wind tunnel for three commonly defined test cases at wind speeds of 10, 15 and 24 m s 1 . Two sets of airfoil data were used. Comparisons of blade loadings showed that the AL/NS technique with the modified airfoil data is in better agreement with the measurements than with the original 2D airfoil data. Comparisons of detailed near-wake velocities showed good agreement with the measurements. Computations including the influence of the geometry of the wind tunnel showed that tunnel effects are not significant and the effect of the geometry of the wind tunnel only results in a speedup of 3% at a thrust coefficient of C T D 1.The AL/NS model developed at DTU consists of a Navier-Stokes solver and an actuator line model. The Navier-Stokes solver EllipSys2D/3D was originally developed at DTU 28 and Risø National Laboratory. 29 To take into account turbulence, 812 Wind Energ. 2012; 15:811-825

show abstract

Section: Introductionmentioning

confidence: 99%

Actuator line/Navier–Stokes computations for the MEXICO rotor: comparison with detailed measurements

2011

View full text Add to dashboard Cite

show abstract

“…Results show C P,F ∼ 0.1 for both solvers and turbulence model. Wilson et al [48] evaluated viscous correction for wind turbine for power production by comparing potential flow predictions and experimental data. The study showed that varied from C P,F ∼ 0.1 to 0.2.…”

Section: Thrust and Power Predictionsmentioning

confidence: 99%

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

Salunkhe

Fajri

O'Doherty

et al. 2019

JMSE

View full text Add to dashboard Cite

This paper documents the predictive capability of rotating blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and Improved Delayed Detached Eddy Simulation (IDDES) computations for tidal stream turbine performance and intermediate wake characteristics. Ansys/Fluent and OpenFOAM simulations are performed using mixed-cell, unstructured grids consisting of up to 11 million cells. The thrust, power and intermediate wake predictions compare reasonably well within 10% of the experimental data. For the wake predictions, OpenFOAM performs better than Ansys/Fluent, and IDDES better than URANS when the resolved turbulence is triggered. The primary limitation of the simulations is under prediction of the wake diffusion towards the turbine axis, which in return is related to the prediction of turbulence in the tip-vortex shear layer. The shear-layer involves anisotropic turbulent structures; thus, hybrid RANS/LES models, such as IDDES, are preferred over URANS. Unfortunately, IDDES fails to accurately predict the resolved turbulence in the near-wake region due to the modeled stress depletion issue.

show abstract

“…argued that drag has little, if any, effect on induced forces, and thus should not be included in computing the induction factors. The discussion on bracketing a solution to the BEM equations in Section 3 is applicable for c d = 0, with one modification. Theorem

((), \underset{normallim}{msub} f (ϕ) MathClass-rel= MathClass-bin- MathClass-rel\infty)

depends on c d being nonzero (see equation ).…”

Section: Additional Considerationsmentioning

confidence: 99%

A simple solution method for the blade element momentum equations with guaranteed convergence

Ning

2013

Wind Energy

174

View full text Add to dashboard Cite

The blade element momentum (BEM) equations, though conceptually simple, can be challenging to solve reliably and efficiently with high precision. These requirements are particularly important for efficient rotor blade optimization that utilizes gradient‐based algorithms. Many solution approaches exist for numerically converging the axial and tangential induction factors. These methods all generally suffer from a lack of robustness in some regions of the rotor blade design space, or require significantly increased complexity to promote convergence. The approach described here allows for the BEM equations to be parameterized by one variable—the local inflow angle. This reduction is mathematically equivalent, but greatly simplifies the solution approach. Namely, it allows for the use of one‐dimensional root‐finding algorithms for which very robust and efficient algorithms exist. This paper also discusses an appropriate arrangement of the equation and corresponding bounds for the one‐dimensional search—intervals that bracket the solution and over which the function is well behaved. The result is a methodology for solving the BEM equations with guaranteed convergence and at a superlinear rate.Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Aerodynamic performance of wind turbines. Final report

Cited by 120 publications

References 0 publications

Actuator line/Navier–Stokes computations for the MEXICO rotor: comparison with detailed measurements

Actuator line/Navier–Stokes computations for the MEXICO rotor: comparison with detailed measurements

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

A simple solution method for the blade element momentum equations with guaranteed convergence

Contact Info

Product

Resources

About