Investigations on the Wake Development of the MEXICO Rotor Considering Different Inflow Conditions

Schulz, Christoph; Meister, Konrad; Lutz, Thorsten; Krämer, Ewald

doi:10.1007/978-3-319-27279-5_76

Cited by 8 publications

(14 citation statements)

References 3 publications

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“…This time, a three‐bladed model wind turbine was investigated, collecting data of the near wake as well as blade loads and pressure distributions . Within several follow‐up projects, the data have been analysed and recent publications showed reasonable agreement between measurements and simulations. In detail, the simulated wake deflection was investigated and the distortion of the wake was discussed.…”

Section: Introductionmentioning

confidence: 71%

“…Moreover, yaw situations can be used on purpose as means of wake control to maximize overall wind park power output . As a consequence of its importance, the phenomenon of yaw and its influences have been studied in several articles . First of all, a brief overview of two wind tunnel experiments shall be given, as these provide controlled inflow conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Since the blind comparison carried out by Simms et al , much has been done in wind turbine modelling. Many approaches focus on the use of engineering tools to simulate wind turbines and the impact of yaw , whereas others model the turbines' geometry . In general, different ways with contradictory priorities can be made.…”

Section: Introductionmentioning

confidence: 99%

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CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine

Schulz¹,

Letzgus²,

Lutz³

et al. 2016

Wind Energy

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This article deals with the influence of yawed inflow conditions on the performance of a single generic 2.4 MW wind turbine. It presents the results of studies performed at the Institute of Aerodynamics and Gas Dynamics by means of computational fluid dynamics, using a fully meshed wind turbine with all boundary layers being resolved. The block-structured flow solver FLOWer is used; a dual-time stepping method for temporal discretization and a second-order Jameson-Schmidt-Turkel method for the calculation of the convective fluxes are applied. All simulations are carried out using a detached eddy simulation approach. In detail, two different wind speeds and a yaw angle range between 50 ı and C50 ı are evaluated in the paper. Based on these data, it is shown that the reduction of power output follows a cosine to the power of X function of the yaw angle. Furthermore, the growing azimuthal non-uniformity of the load distributions with increasing yaw angle magnitude is analysed by spanwise load distributions. As a central influence on the load distributions, the advancing and retreating blade effect is identified. Moreover, the deflection of the wake as a result of the inflow is investigated, and the deflection angles are compared with a modelling approach. A connection line between wake deflection and load asymmetry is drawn. The results are of particular importance for wind park situations with downstream turbines facing the distorted inflow created from upstream ones. 253CFD study on the impact of yawed inflow on a generic wind turbine C. Schulz et al.dynamics solvers using, among others, actuator disc approaches. Several years later, the measurements performed within the Model Experiment in Controlled Conditions (MEXICO) project enlarged the yaw database. 6 This time, a three-bladed model wind turbine was investigated, collecting data of the near wake as well as blade loads and pressure distributions. 6 Within several follow-up projects, the data have been analysed and recent publications 8,9,14 showed reasonable agreement between measurements and simulations. In detail, the simulated wake deflection was investigated and the distortion of the wake was discussed. Even though a great success, none of the measurements were able to describe all effects occurring from yaw misalignment. The reduction of power and mean loads of the turbine, the changing angle of attack over one revolution, the varying induction, the wake distortion and how the different effects correlate with each other. The NASA-Ames measurements cover a wide operational range but provide only little information about the rotor wake. MEXICO and its wide range of particle image velocimetry data provide more information about the near-wake flow field, but lacks the wide range of yaw angles and faces some limitations in turbine set-up as the rotor is not tilted and the tower far downstream the rotor compared with a full-scale turbine. 6,7 Looking at the costs, it is hardly feasible to collect all data needed to investigate most of the yaw effects and cover...

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Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine

Schulz¹,

Letzgus²,

Lutz³

et al. 2016

Wind Energy

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“…Despite the difficulties [14], various modeling approaches have been developed or improved to investigate the unsteady aerodynamics of two wind turbines in yaw [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The dynamic stall phenomenon has been studied using Beddoes-Leishman dynamic stall model validated against the experimental results [27].…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic stall phenomenon has been studied using Beddoes-Leishman dynamic stall model validated against the experimental results [27]. Yaw flow study is commonly conducted by comparing the aerodynamic performance in axial flow and yawed flow, such as in Sørensen [28], Tsalicoglou [29] and Schulz [30]. Relatively large discrepancies can be observed between computations and measurements.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Aerodynamic Performance of the New MEXICO Rotor under Yaw Conditions

2018

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Abstract:The influence of yaw misalignment on the aerodynamic performance of the New MEXICO rotor is investigated using blade-resolved Computational Fluid Dynamics (CFD) approaches with three wind speeds considered at a fixed yaw angle of 30 degrees. The air-load predictions and near wake characteristics from the numerical results are compared and discussed against the most recent wind tunnel test data. The nacelle impact, dynamic stall phenomenon and wake characteristics are analyzed, demonstrating the yaw effects and numerical issues raised from Reynolds-Averaged Navier Stokes (RANS) and Detached Eddy Simulation (DES) computations.

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Aerodynamic Response of Wind Turbines in Complex Terrain to Atmospheric Boundary Layer Flows

Schulz¹,

Lutz²,

Krämer³

2017

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Investigations on the Wake Development of the MEXICO Rotor Considering Different Inflow Conditions

Cited by 8 publications

References 3 publications

CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine

CFD study on the impact of yawed inflow on loads, power and near wake of a generic wind turbine

Comparative Study of the Aerodynamic Performance of the New MEXICO Rotor under Yaw Conditions

Aerodynamic Response of Wind Turbines in Complex Terrain to Atmospheric Boundary Layer Flows

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