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

Schulz, Christoph; Lutz, Thorsten; Krämer, Ewald

doi:10.1007/978-3-319-64519-3_67

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Although, in general, turbine performance in complex terrain has been studied in the past, see e.g. [6][7][8][9], few works focus on the performance bias induced by a streamwise inhomogeneous flow field. Cai et al [10] performed wind tunnel measurements of a model wind turbine exposed to favorable and adverse pressure gradients.…”

Section: Introductionmentioning

confidence: 99%

Is the free wind speed sufficient to determine aerodynamic turbine performance in complex terrain?

Zengler,

Troldborg,

Gaunaa

2024

J. Phys.: Conf. Ser.

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The performance of a wind turbine is usually characterized by its power curve, which relates the wind speed at hub height with its energy production. This relation does not take streamwise inhomogeneities of the inflow – as they might be present in complex terrain – into account. In this work, the consequences of this simplification for performance predictions are analyzed. Simulations using Reynolds-averaged Navier Stokes equations (RANS) with the k-ϵ-fp model as closure are performed. An actuator disc (AD) on the ridge of a quasi two-dimensional Gaussian hill subject to a neutral atmospheric inflow is investigated. Roughness length, hill width and thrust coefficient are varied and the respective induction evaluated. Results indicate that the induction at a given thrust coefficient depends on the terrain configuration; it can be higher or lower than predictions by momentum theory, translating to a decrease or increase in the power coefficient. In this work, a power decrease by up to 15.3 % compared to flat terrain is observed. The maximum power increase is approximately 1.6 %. It is concluded that hub height wind speed or rotor equivalent wind speed are no sufficient measures to universally characterize aerodynamic turbine performance in complex terrain.

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Section: Introductionmentioning

confidence: 99%

Is the free wind speed sufficient to determine aerodynamic turbine performance in complex terrain?

Zengler,

Troldborg,

Gaunaa

2024

J. Phys.: Conf. Ser.

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Wind tunnel testing of a wind turbine in complex terrain

Nanos

Yilmazlar

Zanotti

et al. 2020

J. Phys.: Conf. Ser.

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The paper describes the development of a scaled model of complex terrain, suitable for terrain-wind turbine interaction wind tunnel studies, taking into account flow similarity criteria. The size and the geometry of the experimental model of the complex terrain were refined using results of CFD simulations in order to achieve the best possible flow similarity and avoid edge effects arising from the finite (relative to the rotor size) terrain geometry. Moreover, Particle Image Velocimetry was used to survey the flow field on a longitudinal plane along the terrain center line. Flow measurements with and without a wind turbine model enabled to quantitatively evaluate the speed up produced by the terrain in the region of the wind turbine and the effect of the terrain on the wake characteristics of the wind turbine model.

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

Cited by 2 publications

References 24 publications

Is the free wind speed sufficient to determine aerodynamic turbine performance in complex terrain?

Is the free wind speed sufficient to determine aerodynamic turbine performance in complex terrain?

Wind tunnel testing of a wind turbine in complex terrain

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