Boundary layer suction?

[woodstock74]

OAUGDP:

Aerodynamic Boundary Layer Control Using EHD Effects of a One Atmosphere Uniform

Saw this demonstrated a few years ago, pretty impressive. Not sure the energy required to generate the flow, but the small model I saw plugged into an outlet.

[kach22i]

RE:
Electrohydrodynamics - Wikipedia, the free encyclopedia

I've heard of a woman in Ann Arbor, MI which may be using something similar to generate electricity from wind, but without using any moving parts.

[kach22i]

Originally Posted by Big time

The drag coefficient is reduced by 20.25% using this strategy
Active Flow Control over the Car

Active Flow Control over the Car» only (US$ 28,- / € 21,-)

Dang, I hate paying for things on the Internet. Guess I'll have to wait until this one becomes common knowledge.

[ChazInMT]

I think in gross terms, most people fail to recognize the HUGE volumes of air involved in the automotive aerodynamic equation, conservatively speaking, the air within 15 feet around a typical car and 150 feet behind it, is seriously disrupted by the passing of a car. The math works out to approximately 150,000 cubic feet of air per second passing over the body. I find it difficult to believe that the minute amount of air at the boundary layer region is going to have much impact on this. Big picture thinking calls this one an impractical way of doing things...sort of like saying that if we could get a sparrows wings to beat fast enough, it could propel a Cessna.

But if you want to believe that the 1/2 inch layer of air around the car is all that matters in aerodynamics, feel free to keep deluding yourself, good luck, be certain to report back your results.

[basjoos]

Also how well would this hold up the real world before the road dirt, dust, bugs, and other grunge flying past clog up most of the vacuum holes. The aircraft using this technology were flying 1000's of feet overhead where there are mimimal amounts of small debris in the airstream, not driving behind a semi kicking up a plume of dust behind it.

[aerohead]

I looked through Hermann Schlicting's book,'Boundary Layer Theory'.He sites 46-researchers who've actively investigated blown/suctioned structures,from Prandtl's first paper in 1908,through 1976.
There are probably more but my German isn't very good.
Also,if you can snag a copy of the book Race Car Engineering by Paul Van Valkenburg (sp?),in the very back of the book he has smoke photos of a model Corvette,with,and without suction.It's remarkable..
In my seminars or mod data lists there's also a siting for a fellow by the name of Cornish III who was involved.
Alex Tremulis,writing in the early 1980s had presumed that by now,all cars would have active aerodynamics with Cds of 0.12 using suction slot technology.
Israel's solar-pond driven turbo-generator power production,married to a vehicle's exhaust system may be able to extract enough heat to power a pump.It would be a thermodynamic coup,moving closer towards an 'adiabatic' vehicle.

[aerohead]

I located my last reference.
Kawanishi Aircraft Corp. produced the Shin Meiwa PS-1 and US-1 amphibious aircraft which is a STOL design.It is powered by 4-General Electric gas turbine,turbo-prop engines,and there is a 5th gas turbine embedded within the upper fuselage behind the wings which furnishes compressed-air to the flaps,rudder,and elevator.
The propulsion engines are rated at 3,060 ehp each,there is no mention of the 'pump' engine.