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Rao S.,University of Maine, United States | Xue H.,University of Maine, United States | Bao M.,2nd Institute of Oceanography | Funke S.,Center for Biomedical Computing
Ocean Dynamics | Year: 2016

Tidal power potential is determined across the Western Passage in Passamaquoddy Bay using the Finite Volume Community Ocean Model (FVCOM). The tidal turbines are implemented in FVCOM using the disc actuator theory method to determine the power potential for different densities and arrangements of tidal turbines. At the most efficient setting for 10 turbines across the Western Passage, the optimal turbine drag coefficient is 2.0 and the average power output, in a 2-week period, is ∼819 kW. Results suggest that for a single row of turbines, the addition of turbines decreases the efficiency of the turbine farm, but this decrease in efficiency is less than 7 %. A parallel distribution of turbines in an array diminishes the average power for turbines in the shadow of other turbines, while staggered distribution in an array increases the average power extraction for some turbines, due to the speed gains in the gaps between turbines. A simple tidal farm optimization using the OpenTidalFarm (OTF) model suggests a similar tidal farm distribution. © 2015, Springer-Verlag Berlin Heidelberg.

Xue H.,University of Maine, United States | Bao M.,Ocean University of China | Bao M.,2nd Institute of Oceanography | Bao X.,Ocean University of China | Cameron M.,University of Maine, United States
OCEANS 2013 MTS/IEEE Bergen: The Challenges of the Northern Dimension | Year: 2013

Turbines are implemented in the regional ocean circulation model to determine the energy extraction efficiency of tidal farms. A power curve is determined for different values of flow blockage when 10 turbines are distributed evenly across the Western Passage in the middle 1/3 of the water column. A speed reduction coefficient of 0.6 represents the most efficient case with ∼ 3.95% of the undisturbed in-stream energy being taken. Efficiency is also estimated for different densities and distributions of turbines. The optimum density for a single row appears to be one turbine in every three cells. When turbines are allocated on parallel rows in the direct shadow of one to another the efficiency is reduced because of the wakes, whereas in the lattice form the efficiency is benefited from the speed gain in turbine gaps produced by the neighboring rows. © 2013 IEEE.

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