Rotor and Wake Aerodynamic Analysis of the Hybrid-Lambda Concept - An Offshore Low-Specific-Rating Rotor Concept: Article No. 012008

Daniel Ribnitzky, Pietro Bortolotti, Emmanuel Branlard, Martin Kuhn

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

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.
Original languageAmerican English
Number of pages10
JournalJournal of Physics: Conference Series
Volume2626
DOIs
StatePublished - 2023

NREL Publication Number

  • NREL/JA-5000-85099

Keywords

  • hybrid-lambda
  • offshore wind
  • wind turbine rotor design

Fingerprint

Dive into the research topics of 'Rotor and Wake Aerodynamic Analysis of the Hybrid-Lambda Concept - An Offshore Low-Specific-Rating Rotor Concept: Article No. 012008'. Together they form a unique fingerprint.

Cite this