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The blockage developing in front of a laterally aligned row of wind turbines and its impact on power production over a single turbine was analysed using two different numerical methods. The inflow direction was varied from orthogonal to the row until 45◦, with the turbines turning into the wind, thereby resembling a wind turbine testing site or row in a wind park. The numerical methods included computational fluid dynamics (CFD) with an actuator disc representation of the rotor and a simple vortex method. The forces on the actuator disc were either derived from airfoil data of a modern wind turbine or set as constant. For all methods significant changes were found in the developing flow-field with corresponding effects on the individual power output of the wind turbines. These became more pronounced with increasing inflow angle and predicted a rise in power of up to 2% for the downstream and -1% for the upstream turbines. The vortex method agreed with the CFD method on the overall trend, but its magnitude was lower.
|Number of pages||12|
|Publication status||Published - 2017|
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UniTTe: Unified testing procedures for wind turbines through inflow characterisation using nacelle lidars
Wagner, R., Pedersen, T. F., Troldborg, N., Forsting, A. M., Bechmann, A., Courtney, M., Borraccino, A., Vignaroli, A., Natarajan, A., Sathe, A. & Dimitrov, N.
01/01/2014 → 31/12/2017