Innovative aerodynamic rotor concept for demand-oriented power feed-in of offshore wind turbines

Ribnitzky, Daniel; Berger, Frederik; Kühn, Martin

doi:10.1088/1742-6596/2265/3/032017

Cited by 6 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the degrees of freedom technique, the necessary minimum for a problem with four elements and three levels for each factor is 3 4 (81) tests to equally cover all the factors and levels. In our case, we will adopt the common Orthogonal array L 9 (3 4 ).…”

Section: Taguchi Methods Plan Of Experimentsmentioning

confidence: 99%

“…In order to determine the performance of wind, the statistical features of the wind speeds at the location of installation of the wind farm must be considered. Indeed, the market value of wind power declines during periods of heavy winds, and the exchange price for wind power tends to be near zero on windy days as the amount of wind power in the energy system increase [3,4]. Modern wind turbine blades have increased in size by a factor of 100 versus a drop in energy by a factor of 5 in the past 30 years.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

Qaissi¹,

Elsayed²,

Faqir³

et al. 2023

Energies

View full text Add to dashboard Cite

For the rotor, achieving relatively high aerodynamic performance in specific wind conditions is a long-term goal. Inspired by the remarkable flight characteristics of owls, an optimal trailing edge serration design is investigated and proposed for a wind turbine rotor blade. Fluid flow interaction with the proposed serrations is explored for different wind conditions. The result is supported by subsequent validation with three-dimensional numerical tools. The present work employs a statistical-numerical method to predict and optimize the shape of the serrations for maximum aerodynamic improvement. The optimal combination is found using the Taguchi method with three factors: Amplitude, wavelength, and serration thickness. The viability of the solution on an application is assessed using the Weibull distribution of wind in three selected regions. Results show that the presence of serration is capable of improving the annual power generation in all the investigated cities by up to 12%. The rated speed is also shifted from 10 m/s to 8 m/s for most configurations. Additionally, all configurations show similar trends for the instantaneous torque, where an increase is observed in pre-rated speed, whereas a decrease is noticed in the post-rated speed region. A look at the flow field pattern for the optimal design in comparison with the clean blade shows that the modified blade is able to generate more lift in the pre-stall region, while for the post-stall region, early separation and increased wake dominate the flow.

show abstract

Section: Taguchi Methods Plan Of Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

Qaissi¹,

Elsayed²,

Faqir³

et al. 2023

Energies

View full text Add to dashboard Cite

show abstract

“…This reduces the lever arm of the resulting bending force, and additional peak shaving by blade pitching ensures the limitation of the loads. For further information on the Hybrid-Lambda Rotor, the reader is referred to [3].…”

Section: The Rotor Conceptmentioning

confidence: 99%

“…Especially for offshore sites, this coincides with the peak of the wind speed distribution. The Hybrid-Lambda Rotor, introduced by Ribnitzky et al [3] and further explained in Sec. 2, integrates the application of peak shaving into the blade design process rather than accepting it as a necessary evil.…”

Section: Introductionmentioning

confidence: 99%

Rotor and wake aerodynamic analysis of the Hybrid-Lambda concept - an offshore low-specific-rating rotor concept

Ribnitzky,

Bortolotti,

Branlard

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The low-specific-rating rotor concept Hybrid-Lambda introduces a blade design with nonuniform distribution of design variables (design tip speed ratio and axial induction) along the blade span to alleviate loads of the outboard section in strong winds. In this paper, we validate aerodynamic design calculations, which were carried out with the blade element momentum theory by comparing the results to free vortex wake investigations (FVW). Furthermore, we investigate the wake behaviour with FVW and large-eddy simulations. The results show good agreements between the blade element momentum theory and FVW for integrated rotor quantities (power and thrust). Small deviations are present when the gradients of axial induction along the span are large. The wake of the Hybrid-Lambda Rotor shows advantages in the near-wake region (up to 4 diameters [D] downstream), especially in the outer wake annulus and in low turbulence scenarios. For further downstream positions, the wake is comparable to that of the reference turbine.

show abstract

“…The atmospheric interaction of this turbine has been explored on small scales, showing beneficial wake characteristics on a single turbine level. Using Free-Vortex Wake (FVW) simulations, the HL rotor showed a lower wind speed deficit during rated operation compared to the IEA 15 MW turbine [5].…”

Section: Introductionmentioning

confidence: 99%

Power production and large-scale wake effects of offshore wind turbines with low specific rating

Paulsen,

Dörenkämper,

Steinfeld

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

With the aim to increase the energy yield of large offshore wind farm clusters, especially during low wind speeds, innovative rotor concepts with low specific ratings are being developed. We use mesoscale simulations, to compare wakes and power production of a wind farm cluster with a rated power of 1.17 GW, equipped with a turbine featuring a low specific rating turbine concept, and the IEA 15 MW offshore reference turbine. While the IEA turbine resembles typical offshore wind turbine concepts, the HL rotor features a very large rotor diameter compared to its rated power, thus resulting in a very low specific rating for an offshore turbine. We simulate two wind farms made up of either of the two turbines that have the same installed capacity and farm layout. We found an improved power production of 86 % to 100 % for the HL wind farm in partial load conditions and comparable power production at rated operation. While the HL wind farm exhibits a more pronounced cluster wake during partial load operation, the IEA wind farm induces a larger wind speed deficit in the wake during rated operation. We discuss observed differences in wake behaviour, attributing them to the larger rotor diameter and lower thrust coefficient of the HL concept.

show abstract

Innovative aerodynamic rotor concept for demand-oriented power feed-in of offshore wind turbines

Cited by 6 publications

References 12 publications

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

Rotor and wake aerodynamic analysis of the Hybrid-Lambda concept - an offshore low-specific-rating rotor concept

Power production and large-scale wake effects of offshore wind turbines with low specific rating

Contact Info

Product

Resources

About