Highlighting of ambient turbulence impact on the interaction effects between tidal turbines
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Highlighting of ambient turbulence impact on the interaction effects between tidal turbines Youen KERVELLA Open Ocean, Marine Energy Consultancy 15 rue Kepler, Brest, France Grégory GERMAIN Benoît GAURIER Jean-Valéry FACQ Thomas BACCHETTI Ifremer, Marine Structures Laboratory Boulogne-sur-Mer, France GCGC – Dunkerque – July, 2014
Highlighting of ambient turbulence impact on the interaction effects between tidal turbines
Youen Kervella, Ph.D. in hydrodynamics and sediment dynamics, explains the highlighting of ambient turbulence impact on the interaction effects between tidal turbines.
Text of Highlighting of ambient turbulence impact on the interaction effects between tidal turbines
Highlighting of ambient turbulence impact on the interaction
effects between tidal turbines Youen KERVELLA Open Ocean, Marine
Energy Consultancy 15 rue Kepler, Brest, France Grgory GERMAIN
Benot GAURIER Jean-Valry FACQ Thomas BACCHETTI Ifremer, Marine
Structures Laboratory Boulogne-sur-Mer, France GCGC Dunkerque July,
2014
22/07/2014 Open Ocean 2014 All right reserved 2 Context: Future
tidal turbines areas: intense currents and high turbulence level
Need to know the turbulences impact on turbines Need to estimate
the environmental impact of tidal farms Numerical models to be
calibrated Study: Previous measurements with 1 then 2 tidal
turbines: # Experimental study of the turbulence intensity effects
on marine current turbines behaviour. Part I: One single turbine.
Mycek et al., 2014, Renewable energy. # Experimental study of the
turbulence intensity effects on marine current turbines behaviour.
Part II: Two interacting turbines. Mycek et al., 2014, Renewable
energy. Understanding interactions between 3 turbines in various
configurations Identify the ambient turbulence impact on
performance and wake development Numerical modeling of currents
energy extractions by 6 tidal turbines (with and without TEC) in
Raz Blanchard area (Open Ocean) Introduction Experimental Features
Results Conclusion Setup | configurations Config 1 | Config 2
22/07/2014 Open Ocean 2014 All right reserved 3 Pool : #
dimensions: 18 x 4 x 2 m # currents, waves, free surface # Input
current velocity: from 0,1 to 2,2 m/s # Measurement: LDV, PIV,
torque, .. Experiment: # Input current velocity: 0,8 m/s #
Turbulence intensity (TI): 3 and 15% # Measurement system: LDV,
torque Tidal turbines: # 3 horizontal axis three-bladed turbines of
700 mm diameter # TSR=R/U fixed at 4 (maximum power, Carlier et
al., 2014) # torque and balance => Cp et Ct Introduction
Experimental Features Results Conclusion device | configuration
Performances | Washes
22/07/2014 Open Ocean 2014 All right reserved 4 2 turbines side
by side (2D spaced) upstream and one turbine centred downstream
Over speed recovery created between both upstream turbines Turbine
downstream is instrumented (performance) 2 inter-rows distances
(DIR) tested: 4D and 6D Measurements LDV at -1D, 2D and 4D of the
second row (wakes) Introduction Experimental Features Results
Conclusion device | configuration Performances | Washes
22/07/2014 Open Ocean 2014 All right reserved 5 Maximum power
at TSR = 4 Soft differences for DIR= 4D and DIR= 6D Global curves
form similar for both TI 30 % Cp decrease for TI=15% compared to
TI=3% Introduction Experimental Features Results Conclusion device
| configuration Performances | Washes
22/07/2014 Open Ocean 2014 All right reserved 6 Small
differences for DIR 4D and DIR 6D downstream turbine position,
except for - 1D profil No speed increase at the center of the flume
behind the 1st row for TI=3%. Speed decrease at the center of the
flume behind the 1st row for TI=15% Speed decrease behind turbines
is smoothed when TI increases (from 45 to 70 % for TI=3% and from
10 to 30% for TI=15%) Introduction Experimental Features Results
Conclusion device | configuration Performances | Washes Wakes
Obvious role of the ambient turbulence on performance and wakes
development: - TI increase Cp et Ct decrease (30%) - TI increase
Wakes limited development and smaller speed decrease Turbulence is
key in tidal farm development areas such as Raz-Blanchard, TI
between 15 and 25% estimated Need to consider TI in numerical
modeling Study = test tank and in-situ database used to the
numerical modeling validation 22/07/2014 Open Ocean 2014 All right
reserved 7 Introduction Experimental Features Results Conclusion
device | configuration Performances | Washes
www.openocean.fr Email : [email protected] Open Ocean
Paris 27 rue du Chemin Vert 75011 Paris, France Open Ocean Brest 15
rue Johannes Kpler Technople Brest Iroise site du Vernis 29200
Brest, France THANK YOU FOR YOUR ATTENTION
wwz.ifremer.fr/manchemerdunord Email :
[email protected]
