Abstract
Wind turbines have been getting increasingly larger and multi-MW wind turbines have become mainstream in the market. Due to the very large turbine blades with lengths of more than a few tens of meters, large asymmetric loads are produced. Tower shadow is one of the primary factors that tend to exert asymmetric loads on blades of these large multi-MW wind turbines. This study examines the thrust variations on the three blades and the hub with tower shadow for a 2 MW wind turbine by applying a potential flow model. Thrust variations on the three blades and the hub with tower shadow were calculated using commercial GH Bladed software and the dynamic properties of the thrust variations were then investigated. Results indicated that the amplitudes of the thrust variations on each blade and the hub with tower shadow increased as wind speed increased and 3P frequency component (three times the rotor speed) was dominant in the thrust variations of both the hub and the blades.
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