Experimental Study of Wind Turbine Wake and the Interaction in Different Layout Scheme

The research object is the wake of wind turbine under different layout schemes. The precision anemometer was used to measure and study the interaction of wind turbine wake. For two wind turbines, the wake of the downstream wind turbine was measured when all or part of the downstream wind turbine (second wind turbine) was in the wake field of the upstream wind turbine (first wind turbine). The experimental results show that upstream wind turbine wake influences the near wake of downstream wind turbine greater than the far wake of downstream wind turbine and the flow gradually merges with the phenomenon of small amplitude fluctuations when all the downstream wind turbine are in the upstream wind turbine wake field. When the distance of the two wind turbines is equal to 5D, the influence of upstream wind turbines on the downstream wind turbine becomes little. When part of the downstream wind turbine is in the upstream wind turbine wake field, the part in the wake is influenced by upstream wind turbine wake (mainly tip vortex) and the velocity loss of the part in the wake region is more serious than that of the part out of the wake while the stability becomes better. The axial velocity increases gradually when the horizontal distance of the wind turbine is more than 1.5D. The variation of axial velocity under two kinds of layout schemes is gradually decreased with the increasing of axial distance.