I am sorry this is so long!!
I think that whole theroy of spinning the air through the pipe works because they developed new air Intake
filters that do the same thing. HKS Super Mega Flow Systems
HKS Super Mega Flow Air Filter Systems have been engineered to dramatically reduce inlet restrictions posed by today's sealed factory air boxes. It represents the ultimate in filtered air flow. A typical performance air cleaner construction is bigger funnel = better air flow. HKS has created a supreme funnel design using this concept. This design creates maximum air flow with the least amount of restriction. The end result is a smooth and even air flow with increased engine response, horsepower, and fuel mileage.
The "Bell Mouth Intake
" has been proven since the 50's (Divergent aspect of the Bernoulli's Principal). Almost all turbo shaft helicopters that do not exceed 80 VNE is equipped with them.
The most dramatic testimony for the Tornado is the bottles where the water is passed from one to the other and the air is more uniform.
Stop and think!
Is there a TWO WAY flow in your Intake
Will anything causing a mass of air to change directions cause drag?
Why have they not sought approval for aviation applications?
Remember! Sub-sonic air is UNCOMPRESSABLE in a venturi!!!
Optional Unit VI: Fluid Mechanics
E. Bernoulli's Principle
Streamlining involves reducing the turbulence that results when a fluid flows. In streamlined (laminar) flow, the fluid behaves as if it consisted of thin sheets of fluid. The interchange of fluid between the sheets is minimal in streamlined flow.
When turbulent flow occurs, whirlpools and eddies form. Turbulence results in extra drag on objects moving through a fluid.
The study of forces and pressures that change the motion of fluids is called hydrodynamics.
An incompressible, inviscid fluid which moves into a region having a different cross-sectional area (A) undergoes a change in speed (v). The product A - v remains constant.
P1A1v1 = P2A2v2
If the fluid is incompressible, P1 = P2 and they cancel to give:
A1v1 = A2v2 (equation of continuity)
^^ this proves that all the "Tornado" does is induce drag! No compression!