you cannot increase the mass flowrate of the air without using energy. where is the energy meant to come from, the flow itself? yes the first one fan does drive the second fan which then in turn speeds up the stagnant/slow air in between the fans but even it was 100% efficient (impossible due to frictional losses and stagnant/slow air build up in between the fans due to the pipe being the same diameter) you will get the same mass flowrate as before.
Was not doubting that nor the driving force required for the other processes. There are plenty of energy types out there that with current "available" technology there is an inability to record register or even notice.
Schaubergers books are very insightful. In particular when it comes to centripetal force and centrifugal force, amongst other things.