What is the best type of 6 ft wood fence to block wind in a yard?
As a rule of thumb, tall objects can cast a wind shadow about three to six times their height which diminishes with distance. However, turbulence dominates close to the ground so don't plan on getting 18'  of wind shadow from a fence.

In addition, clearing the land means that the wind will have additional velocity...blowing across 600' of open space actually moves the wind exposure class of a structure from B to C under ASCE-7.

The long and the short is that if you sit next to the fence you can probably create a localized effect, but you cannot use a fence to significantly alter the wind effect across an entire three acre site.