Effects of increasing tip velocity on wind turbine rotor design.

Resor, Brian Ray; Maniaci, David Charles; Berg, Jonathan Charles; Richards, Phillip W.

doi:10.2172/1177045

Cited by 7 publications

(10 citation statements)

References 5 publications

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“…Table 4 summarizes important rotor performance parameters for selected designs. Additional detailed plots and discussion of aerodynamic performance parameters are found in the detailed rotor design report associated with this work (Resor et al, 2014).…”

Section: Aero-structural Optimization Resultsmentioning

confidence: 99%

“…This approach was conservative because it included tip-deflections at azimuth angles that were far from the tower. More detail on the above analyses can be found in the full rotor design report (Resor et al, 2014).…”

Section: Structural Optimization Methodsmentioning

confidence: 99%

“…Reference (Resor et al, 2014) contains the complete listing of HARP_Opt input parameters used for each of the rotor optimizations.…”

Section: Design Variablesmentioning

confidence: 99%

“…Figure 7 contains a summary of the layup design results for all designs. More detailed information is provided in (Resor et al, 2014). Notable observations regarding the layup designs include the following:…”

Section: Flexible Designsmentioning

confidence: 99%

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Effect of Tip-Speed Constraints on the Optimized Design of a Wind Turbine

Dykes¹,

Resor²,

Platt³

et al. 2014

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This study investigates the effect of tip-speed constraints on system levelized cost-of-energy (LCOE). The results indicated that a change in maximum tip-speed from 80 to 100 meters per second (m/s) could produce a 32% decrease in gearbox weight (a 33% reduction in cost), which would result in an overall reduction of 1%-9% in system LCOE depending on the design approach. Three 100-m/s design cases were considered: a low tip-speed ratio/high-solidity rotor design, a high tip-speed ratio/low-solidity rotor design, and a flexible blade design in which a high tip-speed ratio was used along with removing the tip-deflection constraint on the rotor design. In all three cases, the significant reduction in gearbox weight caused by the higher tip-speed and lower overall gear ratio was counterbalanced by increased weights for the rotor and/or other drivetrain components and tower. As a result, the increased costs of either the rotor or drivetrain components offset the overall reduction in turbine costs from downsizing the gearbox. Other system costs were not significantly affected, whereas energy production was slightly reduced in the 100-m/s high-solidity case and increased in the low-solidity case. This situation resulted in system cost-of-energy reductions moving from the 80-m/s design to the 100-m/s designs of 1.5% for the high tip-speed ratio and 5.5% for the final flexible case (the latter result is optimistic because the impact of deflection of the flexible blade on power production was not modeled). The low tip-speed ratio case actually resulted in a cost of energy increase of 2.1%. Overall, the results demonstrated that there is a trade-off in system design between the maximum tip-speed and the overall wind plant cost-of-energy but also that there are several design trade-offs and design constraints that can limit the benefits of higher tip-speed designs. Scope Land-based wind project development has historically limited turbine designs to operate at blade-tip-velocities in the range of 75-80-m/s. The constraint arises from blade-tip aero-acoustic noise generation. The turbine system sound power levels are usually dominated by blade-tip noise when appropriate measures have been taken to mitigate sound emissions and audible tones from the tower head machinery within the nacelle and the power electronic converters often located within the tower base. The study looks at five overall turbine configurations: 1. A baseline 5-megawatt (MW) reference turbine Jonkman et al. (Feb 2009) with maximum tip-speed of 80-m/s 2. An optimized version with the same 80-m/s tip-speed design constraint 3. An optimized design at 100-m/s maximum tip-speed with a high-solidity rotor 4. An optimized design at 100-m/s maximum tip-speed with a low-solidity rotor 5. An optimized design at 100-m/s maximum tip-speed with a low-solidity rotor where the tip-deflection con straint has been removed (as a proxy for a machine that would operate downwind). In each of the design cases, a sequential optimization was performed to design the turbine. The ro...

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Section: Aero-structural Optimization Resultsmentioning

confidence: 99%

Section: Structural Optimization Methodsmentioning

confidence: 99%

“…Reference (Resor et al, 2014) contains the complete listing of HARP_Opt input parameters used for each of the rotor optimizations.…”

Section: Design Variablesmentioning

confidence: 99%

Section: Flexible Designsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Tip-Speed Constraints on the Optimized Design of a Wind Turbine

Dykes¹,

Resor²,

Platt³

et al. 2014

View full text Add to dashboard Cite

show abstract

“…A study by Jamieson suggests that a 15%-20% reduction in turbine capital costs is possible for a flexible downwind configuration with very high tip speeds [5]. A precursor study done by the National Renewable Energy Laboratory (NREL) and Sandia National Laboratories was recently completed using a sequential optimization process for a wind turbine in which the rotor was first optimized, the nacelle and tower were subsequently optimized, and a cost-of-energy analysis was performed for the overall system [6,7]. This study estimated that up to a 3% reduction in the cost of energy was possible when an optimized point design at a 100-m/s tip-speed limit was compared to a baseline optimized design at an 80-m/s limit.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Benefits and Limitations of Increasing Maximum Rotor Tip Speed for Utility-Scale Wind Turbines

Ning

Dykes

2014

J. Phys.: Conf. Ser.

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Trailing-edge noise reduction through finlet-induced turbulence

2023

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Biologically inspired finlet treatments have been shown to effectively reduce the trailing-edge noise of a flat plate and hence are a viable noise-suppression technology for engineering applications. The present work performs a thorough experimental investigation on the near-field dynamics of finlet surface treatments applied to a flat plate. To examine the underlying noise-reduction mechanism, the manipulated flow field is analysed using data from detailed static, unsteady wall-pressure as well as velocity measurements and their correlations. Specifically, the densely populated dynamic transducers allow for the tracking of the turbulent boundary-layer development from upstream to the wake of the finlet-treated area (see supplementary movies), which elucidates the formation of ‘finlet-induced turbulence’ through flow–finlet interaction. Associated turbulence structures are found to further develop within the treated area and structures shed from the top of the finlets are observed to mix and merge with the turbulence being channelled through the space between the finlets in the finlet wake. While the mixing process increases the spanwise turbulence length scale, it significantly attenuates the unsteady wall-pressure fluctuation at the trailing edge and thus leads to broadband reduction of the trailing-edge noise. Moreover, it corroborates the findings of earlier studies suggesting that there exists an optimal distance between finlets and trailing-edge where the mixing effects are most beneficial.

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Effects of increasing tip velocity on wind turbine rotor design.

Cited by 7 publications

References 5 publications

Effect of Tip-Speed Constraints on the Optimized Design of a Wind Turbine

Effect of Tip-Speed Constraints on the Optimized Design of a Wind Turbine

Understanding the Benefits and Limitations of Increasing Maximum Rotor Tip Speed for Utility-Scale Wind Turbines

Trailing-edge noise reduction through finlet-induced turbulence

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