Increased levels of turbulence increase the drag on the turbine blades, which reduces the power extraction. Simultaneously, the power extraction is proportional to the square of the relative velocity at the blades, which increases with higher levels of turbulence.You may refer to the following file:

A turbulence-generating grid with a mesh size of 0,24 meters produced a turbulence intensity of 5,5 % in front of the wind turbine, which corresponds to atmospheric turbulence levels offshore.

Thanks Ahmed Abdelhameed

In my opinion, the effect of free stream turbulence will increase flow inertia so that it delays the separation. Then the wake area becomes narrower so that the pressure drag coefficient (Cp) becomes smaller, and finally the total drag coefficient becomes smaller too. Thus the kinetic energy of wind flow can be utilized more, which means that the efficiency of the turbine becomes higher. Is my thinking correct? Please give your comment.

Thank you

You are right Dr. Sinaga. In fact triggering the flow upstream of the separation point causes the low inertia flow get more momentum and become active which leads to reattaching the flow to the surface. This definitely causes redistribution of the pressure force around the aerofoil and hence enhancing lift force.

Thanks Mohsen Jahanmiri

Please anybody of you have other opinion.

Thank you very much.

Please anybody if you have other opinion.

Thank you very much.

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