peakbagger
In Rembrance , July 2024
I dont have access to wind theory to give you the details. Realistically it costs a lot of money to build roads on the ridgeline and the developers want to maximize thair profits so they are going to mount them as close as possible. Envision the turbine string as a straight line. If the wind is hitting it perpedicular, the turbines can be closely spaced as the disturbed air corresponds somewhat with the outer radius of the tips (plus some distance for tip vortices). If the wind is coming in at an angle to the farm, the distance between the turbines has to be wider as the "shadow" of one turbine will tend to block the undisturbed air to the next turbine in line. Try sketching this up with the wind perpendicular to the string of towers, drawing straight lines back from the outer radius of the turbine blades, then do the same thing at a 45 degree angle. Drag out your college trig and you can see that the towers have to be spaced wider. The developer has to make sure that the adjacent turbine is not in the disturbed air of the upwind turbine as it would introduce vibration in the blades and reduce generation. At some point the turbines will get in each others shadow but hopefully its at a low wind speed which reduces the turbine availability. So unless the turbiens are built in a valley where the wind always blows in on direction, they have to be spaced wider.