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Everytime I think of vortex generators, I think of golf balls. Have you ever seen the size of the wake of a golf ball versus a smooth sphere? Area wise, it's 4 to 5 times smaller. VGs have been known to keep the flow attached to a surface where it would otherwise separage and create a pressure drag zone.
Now, I don't really understand how they could be noise reducing features in this case. Where does the noise originates from? Does it come from the separation of the flow at the trailling edge of the mirror? If so I could only imagine that these would work by inducing turbulences that disrupt the laminar flow before it meets the low pressure wake.
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