2019
DOI: 10.1103/physrevfluids.4.110504
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Horizontal axis wind turbine testing at high Reynolds numbers

Abstract: Detailed studies of modern large-scale wind turbines represent a significant challenge. The immense length scales characteristic of these machines, in combination with rotational effects, render numerical simulations and conventional wind tunnel tests unfeasible. Field experiments can give us important insight into the aerodynamics and operation, but they are always accompanied by large amounts of uncertainty, due to the changing nature of the inflow and the lack of accurate control of the test conditions. Her… Show more

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Cited by 27 publications
(14 citation statements)
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“…The topology of the torque space spanned by 1 and will be different for full-scale systems, given the differences in full-scale turbine design and aerodynamics. A lack of Reynolds-number invariance in these results may also play a role in the precise topology of the torque space, since the chord-based Reynolds numbers encountered in these experiments (5.6 × 10 4 9.2 × 10 4 ) were much lower than the invariance criterion of ≥ 3.5 × 10 6 proposed by Miller et al 30 . Still, as long as a sufficiently reliable local linearization is possible, the procedure outlined in Section III D for computing the aerodynamic constants ℓ and should continue to give accurate predictions of timeresolved dynamics.…”
Section: Applications To Full-scale Wind Turbinesmentioning
confidence: 50%
“…The topology of the torque space spanned by 1 and will be different for full-scale systems, given the differences in full-scale turbine design and aerodynamics. A lack of Reynolds-number invariance in these results may also play a role in the precise topology of the torque space, since the chord-based Reynolds numbers encountered in these experiments (5.6 × 10 4 9.2 × 10 4 ) were much lower than the invariance criterion of ≥ 3.5 × 10 6 proposed by Miller et al 30 . Still, as long as a sufficiently reliable local linearization is possible, the procedure outlined in Section III D for computing the aerodynamic constants ℓ and should continue to give accurate predictions of timeresolved dynamics.…”
Section: Applications To Full-scale Wind Turbinesmentioning
confidence: 50%
“…The model is supported in an access port located 1.1 m downstream of the entrance to the test section. Further information on the facility can be found in Jiménez et al (2010), Miller et al (2018 and Miller et al (2019).…”
Section: Experimental Set-upmentioning
confidence: 99%
“…In addition, any small temperature and static pressure changes during a run were measured and used to determine the true fluid properties using real-gas relationships. This facility, and the data processing and reduction techniques have been detailed in prior work using this facility (Miller et al., 2019).
Figure 1.Schematic diagram of the HRTF as viewed from above the facility.
…”
Section: Experimental Facilitymentioning
confidence: 99%
“…The present work more fully explores the operational space of the high-solidity VAWT for a range of values by matching and simultaneously to field-relevant conditions. To accomplish this, a specialized wind tunnel was used which operates with highly compressed air as the working fluid (as described in the earlier work of Miller et al., 2018; Miller, Kiefer, Westergaard, Hansen & Hultmark, 2019). The high static pressure inside the tunnel decreases the fluid kinematic viscosity by up to two orders of magnitude over air at atmospheric pressure.…”
Section: Introductionmentioning
confidence: 99%