I’m trying to figure out what happens to wind when you extract energy from it, specifically by going past a wind turbine.
Before hitting the turbine the air has an amount of kinetic energy, based on its mass and (squared) velocity. The turbine takes some of that energy out. So, is the departing air just moving slower? But if you had air coming towards the turbine faster than it departs on the other side, wouldn’t that mean an accumulation of air around or behind the turbine? I’m guessing the flow is more complicated than that, and results in turbulence somewhere.
Does the air maybe lower in temperature? The pressure change? What other results might there be of the energy being removed?