Experimentally observed effects of yaw misalignment on the inflow in the rotor plane

Haans, Wouter; Kuik, van Gam Gijs; Bussel, van Gjw Gerard

doi:10.1088/1742-6596/75/1/012012

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…Several researchers have shown the wake deflection in the near‐wake region through wind tunnel experiments . Figure , adapted from the paper by Haans et al ., shows the wake deflection in the near‐wake region measured in an open‐jet wind tunnel. The wake was defined by tracing the tip vortices that were shed by the turbine rotor.…”

Section: Introductionmentioning

confidence: 99%

Characterizing power performance and wake of a wind turbine under yaw and blade pitch

et al. 2015

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Wind turbine wakes have been recognized as a key issue causing underperformance in existing wind farms. In order to improve the performance and reduce the cost of energy from wind farms, one approach is to develop innovative methods to improve the net capacity factor by reducing wake losses. The output power and characteristics of the wake of a utility-scale wind turbine under yawed flow is studied to explore the possibility of improving the overall performance of wind farms. Preliminary observations show that the power performance of a turbine does not degrade significantly under yaw conditions up to approximately 10°. Additionally, a yawed wind turbine may be able to deflect its wake in the near-wake region, changing the wake trajectory downwind, with the progression of the far wake being dependent on several atmospheric factors such as wind streaks. Changes in the blade pitch angle also affect the characteristics of the turbine wake and are also examined in this paper.

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Section: Introductionmentioning

confidence: 99%

Characterizing power performance and wake of a wind turbine under yaw and blade pitch

et al. 2015

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“…A characteristic of the near wake is the presence of the tip vortices shed by the blade tips, which rotate and propagate downstream, defining the boundary between the wake and the outer flow, in other words, defining the wake envelope. The wake deflection in the near wake area might be defined by the tip vortices as reported by Haans et al (2007).…”

Section: Wake Detectionmentioning

confidence: 92%

Wind turbine wake position detection and rotor speed-based wake steering validation in a wind tunnel wake simulator

et al. 2019

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Wind farm control has demonstrated power production improvements using yaw-based wake steering compared to individual turbine optimization. However, slower yaw actuation rates in response to rapid inflow changes lend to impracticality of yaw-based steering, as it causes time-varying downstream rotor–wake overlap, power production fluctuation, and consequent reduction. Therefore, closed-loop wake control is required to mitigate wake deflection uncertainty. To respond to rapid inflow variations, rotor speed actuated is investigated here. Furthermore, wake position information is required as feedback for closed-loop control function. For field-installed turbines, nacelle-based Light detection and ranging (LIDAR) is expected to provide this information. So far, LIDAR-derived wake position has been determined through model-based field reconstruction of scattered LIDAR data. However, this requires sophisticated, economically prohibitive LIDARs. To incorporate inexpensive, two-beam LIDAR for wake detection, a tip vortex-based approach was developed and is also presented here. These contributions can be considered as intermediate steps toward realization of a novel closed-loop wake control.

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“…The optimum blade design for the rotor is not that which would be required of an open rotor but is different in planform shape and twist, due to the presence of the flow field generated by the duct. Venters et al (2017) have also indicated C p values, based on the duct exit area, of greater than 0.593, possibly pointing the way for a wind energy extraction device that is more efficient than a turbine of equal diameter.…”

Section: Introductionmentioning

confidence: 97%

Experimental validation of a ducted wind turbine design strategy

Kanya

Visser

2018

Wind Energ. Sci.

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Abstract. A synergistic design strategy for ducted horizontal axis wind turbines (DWTs), utilizing the numerical solution of a ducted actuator disk system as the input condition for a modified blade element momentum method, is presented. Computational results of the ducted disk have shown that the incoming flow field for a DWT differs substantially from that of a conventional open rotor. The rotor plane velocity is increased in the ducted flow field, and, more importantly, the axial velocity component varies radially. An experimental full-scale 2.5 m rotor and duct were designed, using this numerical strategy, and tested at the University of Waterloo's wind turbine test facility. Experimental results indicated a very good correlation of the data with the numerical predictions, namely a doubling of the power output at a given velocity, suggesting that the numerical strategy can provide a means for a scalable design methodology.

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Experimentally observed effects of yaw misalignment on the inflow in the rotor plane

Cited by 10 publications

References 17 publications

Characterizing power performance and wake of a wind turbine under yaw and blade pitch

Characterizing power performance and wake of a wind turbine under yaw and blade pitch

Wind turbine wake position detection and rotor speed-based wake steering validation in a wind tunnel wake simulator

Experimental validation of a ducted wind turbine design strategy

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