FN Archimer Export Format
PT J
TI Experimental Investigation of Surface Waves Effect on a Ducted Twin Vertical Axis Tidal Turbine
BT 
AF Moreau, Martin
   Germain, Gregory
   Maurice, Guillaume
AS 1:1;2:1;3:2;
FF 1:PDG-REM-RDT-LHYMAR;2:PDG-REM-RDT-LHYMAR;3:;
C1 Ifremer, Marine Hydrodynamics Laboratory, LHyMar, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France
   HydroQuest SAS, 16 Chemin de Malacher, 38240 Meylan, France
C2 IFREMER, FRANCE
   HYDROQUEST SAS, FRANCE
SI BOULOGNE
SE PDG-REM-RDT-LHYMAR
IN WOS Ifremer UPR
   DOAJ
   copubli-france
IF 2.9
TC 0
UR https://archimer.ifremer.fr/doc/00851/96282/104526.pdf
   https://archimer.ifremer.fr/doc/00851/96282/105266.pdf
LA English
DT Article
DE ;tidal energy;cross-flow turbine;tank tests;surface waves
AB The cost effective design of tidal turbines requires a good estimation of the loading cycles and their extrema that are related to the unsteady fluctuations of the current velocity. Apart from the ambient turbulence, the main source of velocity fluctuations is the presence of surface waves. In the present study, we analyse the effect of waves propagating against the current on the performance and the loads of a twin vertical axis tidal turbine by an experimental approach at a 1/20 scale. Overall, the results show little or no effect of the waves on the average power and loads compared to the condition with current only, but a significant impact on their standard deviation that rises linearly with the waves amplitude. The drag, lift and pitching moment show extended ranges up to 7.5 times higher and extreme values exceedance by 60 to 100 % with irregular waves compared to the condition without waves. Those load and power fluctuation increase are fully due to the presence of waves as the coherence function between the rotor torque or the loads and the velocity spectra exceed 0.5 on the whole wave frequency bandwidth. The results also reveal a rotational sampling of the waves by the rotors that had also been observed on horizontal axis turbines. From a structural design point of view, the authors recommand to conduct tests in irregular wave conditions as the loads range and extreme values are 1.5 to 2 times higher than those encountered with regular waves of the same significant height and period. 
PY 2023
PD OCT
SO Journal Of Marine Science And Engineering
SN 2077-1312
PU MDPI AG
VL 11
IS 10
UT 001119424000001
DI 10.3390/jmse11101895
ID 96282
ER

EF