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. The size of wind turbines has been steadily growing in the pursuit of a lowercost of energy by an increased wind capture. Within this trend, the vast majorityof wind turbine rotors have been designed based on the conventionalthree-bladed upwind concept. This paper aims at assessing the optimality ofthis configuration with respect to a three-bladed downwind design, with andwithout an actively controlled variable coning used to reduce the cantileverloading of the blades. Results indicate that a conventional design appearsdifficult to beat even at these turbine sizes, although a downwindnonaligned configuration might be an interesting alternative.

Comparison between upwind and downwind designs of a 10 MW wind turbine rotor