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Research Papers: Gas Turbines: Aircraft Engine

RANS Computations of MEXICO Rotor in Uniform and Yawed Inflow

[+] Author and Article Information
Christina Tsalicoglou

e-mail: christina.tsalicoglou@alumni.ethz.ch

Samira Jafari

e-mail: jafari@lec.mavt.ethz.ch

Ndaona Chokani

e-mail: chokani@lec.mavt.ethz.ch

Reza S. Abhari

e-mail: abhari@lec.mavt.ethz.ch
Laboratory for Energy Conversion,
Department of Mechanical
and Process Engineering,
ETH Zurich,
Zurich 8092, Switzerland

1Corresponding author.

Contributed by the Aircraft Engine Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received July 10, 2013; final manuscript received August 2, 2013; published online October 22, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(1), 011202 (Oct 22, 2013) (8 pages) Paper No: GTP-13-1253; doi: 10.1115/1.4025362 History: Received July 10, 2013; Revised August 02, 2013

Full Reynolds-averaged Navier–Stokes (RANS) simulations of the flow in the near wake of a three-bladed horizontal-axis wind turbine are presented. The simulations, which are based on the model experiments in controlled conditions (MEXICO) experiment and include the complete rotor, nacelle, and tower show good agreement with experimental data, with 4% difference relative to measured flow properties. The flow properties in the near wake are detailed for both uniform and nonuniform flow conditions. The effects of increasing tip-speed ratio and a yawed inflow of 30 deg are studied. The full RANS simulations are used to support the development of an immersed wind turbine model at ETH Zurich. This model allows for modeling of the wake evolution and interactions in wind farms, for multiple turbines, with substantially reduced computational effort.

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References

Figures

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Fig. 1

(a) Wind turbine used for the MEXICO rotor experiment in the DNW wind tunnel [8] and (b) dimensions of MEXICO wind turbine in meters

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Fig. 2

(a) Computational domain used for simulations of uniform inflow and (b) definition of coordinate system with yaw angle γ and pitch angle θ

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Fig. 3

(a) Computational domain used for simulations of yawed inflow and (b) close-up view of rotating cylindrical domain around wind turbine

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Fig. 4

(a) Unstructured octree-type volume mesh and (b) closer view of the mesh around the wind turbine blade at midspan

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Fig. 5

Effect of grid refinement on predicted torque compared to experiments for different tip-speed ratios

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Fig. 6

Comparison of predicted pressure coefficients with experiments at different spanwise positions for λ = 6.67

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Fig. 7

Distribution of the turbulence intensity directly downstream of the rotor plane (0.1D), (a) for λ = 4.17 and (b) for λ = 6.67. The radial extent of the plot is 1D.

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Fig. 8

Location of radial traverses for prediction and measurements in MEXICO rotor experiment

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Fig. 9

Comparison of predicted velocities with experiments along four radial traverses 0.05D downstream of the rotor for λ = 4.17

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Fig. 10

Location of axial traverse for prediction and measurements in MEXICO rotor experiment

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Fig. 11

Comparison of predicted velocity components with experiments along axial traverse for λ = 6.67

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Fig. 12

Wake expansion against downstream distance λ = 4.17,6.67, and 10

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Fig. 13

Contour of total velocity at x = -2D for (a) λ = 4.17 and (b) λ = 6.67. The radial extent of the plots is 2D. Comparison of predicted total velocity at x = -2D to ECN Wakefarm model for the two different tip-speed ratios.

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Fig. 14

In-plane velocity vectors at x = -1D and x = -2D, superposed on contours of in-plane velocity magnitude for (a) for λ = 4.17 and (b) λ = 6.67. The radial extent of the plots is 1D.

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Fig. 15

Contours of vorticity in horizontal plane at hub-height. (a) λ = 4.17 and (b) λ = 6.67. Uniform inflow case.

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Fig. 16

Coordinate system for simulations with yawed inflow. The location of the axial traverse at r = rin used for comparison with measured velocities is also shown.

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Fig. 17

Periodic variation of the torque acting on the rotor operating in yawed inflow

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Fig. 18

Comparison of the predicted velocity components with experiment along axial traverse for yawed inflow case

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Fig. 19

Contour of total velocity at x = -0.5D. The radial extent of the plot is 2D. The location of the tower and rotor is shown in the left half of the plane.

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Fig. 20

Plan view of predicted total velocity in horizontal plane at hub height. Yawed inflow case. Tip-speed ratio is 6.67.

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Fig. 21

Contours of (a) yaw angles and (b) in-plane velocities at x = -1D. The radial extent of the plots is 2D. The location of the tower and rotor is shown in the left half of the plane.

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Fig. 22

Contour of vorticity in horizontal plane at hub-height. 30 deg yawed inflow case.

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