Ouro, P;
Stoesser, T;
(2019)
Impact of Environmental Turbulence on the Performance and Loadings of a Tidal Stream Turbine.
Flow, Turbulence and Combustion
, 102
(3)
pp. 613-639.
10.1007/s10494-018-9975-6.
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Abstract
A large-eddy simulation (LES) of a laboratory-scale horizontal axis tidal stream turbine operating over an irregular bathymetry in the form of dunes is performed. The Reynolds number based on the approach velocity and the chord length of the turbine blades is approximately 60,000. The simulated turbine is a 1:30 scale model of a full-scale prototype and both turbines operate at very similar tip-speed ratio of λ ≈ 3. The simulations provide quantitative evidence of the effect of seabed-induced turbulence on the instantaneous performance and structural loadings of the turbine revealing how large-scale, energetic turbulence structures affect turbine performance and bending moments of the rotor blades. The data analysis shows that wake recovery is notably enhanced in comparison to the same turbine operating above a flat-bed and this is due to the higher turbulence levels generated by the dune. The results demonstrate the need for studying in detail the flow and turbulence characteristics at potential tidal turbine deployment sites and to incorporate observed large-scale velocity and pressure fluctuations into the structural design of the turbines.
| Type: | Article |
|---|---|
| Title: | Impact of Environmental Turbulence on the Performance and Loadings of a Tidal Stream Turbine |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s10494-018-9975-6 |
| Publisher version: | https://doi.org/10.1007/s10494-018-9975-6 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| Keywords: | Large eddy simulation, Tidal stream turbines, Flow over a dune, Survivability, Turbulence, Renewable energy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10058100 |
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