FN Archimer Export Format
PT J
TI Spatial integration effect on velocity spectrum: Towards an interpretation of the − 11/3 power law observed in the spectra of turbine outputs
BT 
AF Druault, Philippe
   Gaurier, Benoit
   Germain, Gregory
AS 1:1;2:2;3:2;
FF 1:;2:PDG-REM-RDT-LCSM;3:PDG-REM-RDT-LCSM;
C1 Sorbonne Université, CNRS, Institut Jean Le Rond d’Alembert, F-75005, Paris, France
   Ifremer, Marine Structure Laboratory, 150 Quai Gambetta, 62200, Boulogne-sur-mer, France
C2 UNIV SORBONNE, FRANCE
   IFREMER, FRANCE
SI BOULOGNE
SE PDG-REM-RDT-LCSM
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 8.7
TC 14
UR https://archimer.ifremer.fr/doc/00729/84086/89051.pdf
LA English
DT Article
DE ;Wind and tidal turbines;Power law decay spectra;Power spectral density;Turbulence
AB To improve the turbine operational life, the interaction between flow properties and turbine performance needs to be elucidated. We then propose to examine the physical origin of the power-law scaling in the inertial range of turbine power outputs by experimentally exploring the spectral content of a 1:20 scaled model of a three-bladed horizontal-axis turbine positioned in a 3D turbulent flow. First, measurements confirm that the turbine power frequency spectra exhibit a power law decay proportional to −11/3 in the inertial range. Knowing that the turbine power fluctuations are linearly dependent on the incoming velocity fluctuations, PIV measurements are carried out to study the effect of the spatially integrated velocity onto its resulted spectrum. It is demonstrated that in inhomogeneous anisotropic turbulent flow, the velocity spectrum of its spatial average along N direction(s) has an inertial slope of −5/3 − 2N/3. This information is used to physically interpret the power-law scaling in the inertial range of the turbine power spectra. The previously observed f−11/3 scaling results from a 2D-spatial average velocity field coupled with a spectral average over blades. This physical explanation confirms previous works in which a transfer function was developed between incoming turbulence and the turbine power outputs. 
PY 2022
PD JAN
SO Renewable Energy
SN 0960-1481
PU Elsevier BV
VL 181
UT 000708443600004
BP 1062
EP 1080
DI 10.1016/j.renene.2021.09.106
ID 84086
ER

EF