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Vestas 2MW turbines at Horns Reef (Horns Rev) from 2004
"Life shrinks or expands in proportion to one's courage." - Ana´s Nin
and the fact that there isn't much interaction between rows.
however, the wake does cause efficiency - as exemplified in cars driving in the wake of a car in front of theirs to minimize drag and wind resistance
What my brilliant possibility requires is either the ability to dither the wind direction back and forth by a few degrees or to rotate the array at a similar rate and I cannot imagine a feasible way to do that. I wrote before I thought.
As the Dutch said while fighting the Spanish: "It is not necessary to have hope in order to persevere."
Reynolds number is the ratio of inertial forces to viscous forces
Laminar flow has a Reynolds number below 2000
Turbulent flow usually is somewhere above that because thtere is a transition state, it is not exactly at 2000
The Coefficient of Lift is defined as the lift force over the inertial forces so if the inertial forces are high (as in turbulent flow), the Coefficient of Lift is larger
The Coefficient of Drag on the other hand, is defned as the forces of drag over the viscous forces, so a lower Reynolds number (in laminar flow) would have more viscous forces and a higher Coefficient of Drag.
Therefore, turbulent flow should provide a more efficient ratio of Lift to Drag.
Is there data on the output power of successive generators back from the first?
Yes, there is, but the results are slightly counter-intuitive. From memory, the highest losses are in the second row, and decrease beyond that.
Distance between rows is typically longest in the prevailing wind conditions, not unsurprisingly - typically 7-8 rotor diameters.
The drop in efficiency has to do with the wind speed not the effect of turbulence.
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