This paper describes the use of a lifting line model in order to determine the optimum circulation distribution on a marine turbine's blades, based solely on their geometrical and operational parameters and on the characteristics of the inflow. A linear solution is proposed first, which includes the effects of viscous drag through a drag-to-lift ratio. The model is then extended to include higher order terms in the case of inviscid flow. The maximum efficiencies for both models are presented as a function of the turbine's tip speed ratio and the number of blades.

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