A numerical performance analysis of aducted, high-solidity tidal turbine in yawed flow conditions

Mitchell G. Borg, Qing Xiao, Steven Allsop, Atilla Incecik, Christophe Peyrard

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
27 Downloads (Pure)


Analysing the fluid dynamic performance of a bare rotor when succumb to yawed flow conditions has consistently presented a diminishment in mechanical power conversion efficacy. Introducing a duct along the rotor perimeter has been acknowledged to sustain performance, yet the causation behind this phenomenon is uncertain. This study puts forward an investigation into the hydrodynamic performance concerning a true-scale, ducted, high-solidity tidal turbine in yawed free-stream flows by utilising blade-resolved, unsteady computational fluid dynamics. Investigating the performance within an angular bearing range of 0 o to 45 o with the turbine axis, increases in mechanical rotational power and thrust are acknowledged within a limited range at distinct tip-speed ratio values. Through the multiple yaw iterations, the maximum attainment falls at an angle of 23.2 o , resulting in a power increase of 3.44% to a peak power coefficient of 0.35 at a nominal tip-speed ratio of 2.00, together with an extension of power development along higher tip-speed ratios. In verification of the power increase, the outcomes are analysed by means of linear momentum theory; by utilising area-averaged values of static pressure acquired from annular radial surfaces fore and aft of the rotor, an analogous relationship with the blade-integrated outcomes is attained. The analysis concludes that, at higher tip-speed ratios, the pressure drop across the rotor increases at limited flow bearings, enhancing the resultant axial force loading upon the blades, hence providing further performance augmentation of the ducted, high-solidity tidal turbine.
Original languageEnglish
Pages (from-to)179-194
Number of pages16
JournalRenewable Energy
Early online date13 May 2022
Publication statusPublished - Jun 2022


  • turbine performance
  • yawed flow
  • high solidity
  • open centre
  • tidal turbine
  • ducted tidal turbine
  • RSM


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