I'm not sure, but I believe that there are problems with laminar flow systems at high mach and certainly at ultra-sonic (mach 20 was mentioned above), both because of the the effect of heat on the surfaces not being able to maintain the tiny ribs (passive) and holes (active suction) necessary to create the laminar effect and the speed differential between the medium and the inducible vacuum sucking into the laminar holes. There's a ton of interesting research at NASA on this, and you could start
here.
Whoosh!
Buffy
