The prediction of horizontal axis wind turbine performance in yawed flow using an unsteady prescribed wake model

Coton, F. N.; Wang, T

doi:10.1243/0957650991537419

Cited by 46 publications

(30 citation statements)

References 12 publications

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“…Wind turbines frequently operate with a yaw misalignment due to limitations in the instrumentation that is used to determine the wind direction [8,9] and/or the yaw control system. The effects of rotor yaw on wind turbine aerodynamics and stability have been studied in previous works [10,11].…”

Section: Introductionmentioning

confidence: 99%

Downwind wind turbine yaw stability and performance

2015

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a b s t r a c tIn this experimental work, the yaw stability and performance of three different downwind rotors are measured and compared to those of the corresponding upwind rotors. A modular scale-model wind turbine that allows for either upwind or downwind operation, with a range of rotor cone and yaw angles, is used. The measurements, at near full-scale Reynolds numbers, show all downwind rotor configurations have yaw stability. On the otherhand, upwind turbines are shown to be either unstable or to have significantly reduced yaw stability compared to the corresponding downwind rotor configurations. Downwind configurations with zero, 5 and 10 cone have higher shaft power and rotor thrust than the corresponding upwind configurations. For zero yaw, the 5 and 10 cone angle, the downwind configurations each yield 5% more power, and have only 3% higher thrust, than the upwind configurations, indicating a potential benefit in performance compared to upwind configurations. Overall, it is concluded that coned downwind configurations provide for easier yaw control and yield more power.

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Section: Introductionmentioning

confidence: 99%

Downwind wind turbine yaw stability and performance

2015

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“…Apparently, three conditions should be met to obtain the parameters A , B and σ in Eq. (6). Firstly, in order to represent the experimental data more accurately, σ is supposed to be a function of 1 R :…”

Section: Gaussian Distribution Predictionmentioning

confidence: 99%

Numerical Simulation and Wake Modeling of Wind Turbine Rotor as an Actuator Disk

Shen

Wang

Zhong

2012

Int. J. Mod. Phys. Conf. Ser.

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Numerical simulations of flow fields around the wind turbine rotor simplified as an actuator disk (AD) with zero thickness have been made to investigate the flow structure and wake development in different operation states. A N-S solver has been used and the energy extracted by the rotor is represented by a discontinuous pressure jump through the actuator disk. Axial pressure and velocity development from far upstream to far downstream is fully described by the simulations, which could never be obtained by the momentum theory. It is showed that there are significant differences in wake development between inviscid and viscous conditions. In inviscid simulations, the axial velocity keeps decreasing along the oncoming flow direction, which is consistent with the momentum theory. In viscous simulations, however, the axial velocity first decreases but then gradually recovers approaching to the undisturbed velocity, due to momentum transport from outer flow to wake flow by viscous shear effect. Based on the numerical analysis, the work of this paper is also focused on wake modeling. A new two-dimensional models based on nonlinear wake development has been developed, which is capable to describe the far wake more accurately.

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“…Due to the complicate computation of near wake, some simple algorithms have been proposed to deal with near wake region in the far wake simulation. These simplified methods cannot provide enough information of near wake flow characteristic, for example, in Jensen wake model [2], the axial velocity of air flow is reckoned to be a constant in downstream cross section. In this paper, a novel vortex model is proposed to delicately depict the flow field characteristics in the downstream section.…”

Section: Introductionmentioning

confidence: 99%

A novel 3-D near wake vortex model for far wake simulation

Meng¹,

Liu²,

Li³

et al. 2013

2nd IET Renewable Power Generation Conference (RPG 2013)

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Wake effect widely exists in wind farms, which causes output power loss and higher fatigue load. Consequently, wake simulation, especially far wake, is significant for the wind farm micro-siting and wind farm operation. Interestingly, the simulation of near wake, which governs the initial condition of far wake, cannot be avoided in far wake simulation. Due to the complicate flow characteristics of near wake region, some simple near wake processing methods have been proposed, which cannot effectively depict details in near wake region. Combined with the Prandtl's approximation for the tip-root loss factor, a vortex model is proposed in this paper to calculate the near wake flow field for far wake simulation. To improve the efficiency of this vortex method, Particle Swarm Optimization (PSO) algorithm is employed to optimize the parameters, the helix angle and vortex core radius of tip and root vortex. A good agreement with Prandtl's approximation is achieved, and the 3 directional components of velocity are predicted, which is more detailed than the near wake description of Jensen wake model.

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The prediction of horizontal axis wind turbine performance in yawed flow using an unsteady prescribed wake model

Cited by 46 publications

References 12 publications

Downwind wind turbine yaw stability and performance

Downwind wind turbine yaw stability and performance

Numerical Simulation and Wake Modeling of Wind Turbine Rotor as an Actuator Disk

A novel 3-D near wake vortex model for far wake simulation

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