Plasma drag reduction

[aerohead]

Originally Posted by freebeard

Answering myself to bump the thread. This may be important.

https://arxiv.org/abs/1609.04054


First problem seems to be it's deafening.

Looks like a DELCO spark plug that's been on the market for a decade or so.

[aerohead]

Originally Posted by teoman

I am gearing up to give this a go.

I have copper tape and kapton tape to create the plasma generators and as a power supply i have the module from a tazer and the electronics of ozone generators (they create plasma which creates ozone)


Would adding these generators to the wheel wells be beneficial?




And what is an initial good design for the rear of the car?

the benefit would come from the all-body sensor package that would feed real-time data to the CPU, to calculate generator participation from the terra-byte software package necessary to control and modulate operations. The actual generators would b the easy part. And the entire surface of the vehicle would be involved, as we're in subsonic flow where a change in one location translates to a change everywhere else.

[freebeard]

It would have to 'travel', fore and aft, around on the body, as the apparent wind spectra could be constantly changing orientation.

wickerbills need to move from their optimal location?

And the entire surface of the vehicle would be involved, as we're in subsonic flow where a change in one location translates to a change everywhere else.

So wickerbills have to cover the whole envelope? Like dimples?

[aerohead]

Originally Posted by freebeard

wickerbills need to move from their optimal location?


So wickerbills have to cover the whole envelope? Like dimples?

There wouldn't be any optimal location. That could vary by the mile, depending on weather.
You could do something for zero yaw, but it would be defeated as soon as the wind came up or changed direction, or the car changed direction.

[freebeard]

It's been quiet on the ionic thruster front, but here's this:

Designing A Self Propelling Ionic Thrust Wing

Even if it's not enough thrust for a flying wing, surely a Coanda nozzle (similar to Jetoptera's design) grafted onto the aft of an Aptera would be possible.

[Logic]

Originally Posted by freebeard

It's been quiet on the ionic thruster front, but here's this:

Even if it's not enough thrust for a flying wing, surely a Coanda nozzle (similar to Jetoptera's design) grafted onto the aft of an Aptera would be possible.

That's just him again, looking for clicks/money.

He gets it to turn on a turntable with a counterbalance and all but his 'wanting to build a flying aircraft' with a similar contraption is going nowhere IMHO:
The added drag and those 'thrusters' buggering up the airflow above the wing...

Now had he gone pulsed DC Dielectric Barrier Discharge (DBD) where you would get the same flow over the top of the wing, in the boundary layer no less, withOUT all that added drag and flow disruption it would be a whole lot more interesting.
But as an aid to the aerodynamics of a conventional, propeller or jet powered aircraft wing.

One might even do a bit of MHD on the wing tips to ameliorate tip vortices as the air is ionized anyway.

Also; why stop with the wings if a propeller is just a small wing?
(so too for turbine blades etc)


More On Topic:
If DBD can be used to basically negate skin surface drag = boundary layer, from around the point that flow changes from laminar to turbulent on car bodies using DBD, things might get interesting!
In the newer post on the topic research points to a net win where the power required to power DBD is lower than the power lost to drag without it.

ie: For less power than is lost to drag; it looks like air can be persuaded to stay attached to surfaces. Even the ...er... trailing edges of vehicles, resulting in a smaller wake.

It's EASY to test/try: (Where the 'shouting starts?)
All one needs is one or more of these $12 power supplies, a roll of Kapton Tape, some strips of Aluminium Foil, some 1 mega ohm resistors and a stick of Pritt.

Oh; and a look at b here;

and a look at the paper here:
https://www.nature.com/articles/s41598-019-42284-w

(The linked PSU is not an ideal, efficient self-tuning resonant circuit, but for tuft testing etc, it's fine)

[freebeard]

I read the abstract and skimmed for a while. I guess the gray in the illustration is the dielectric? And the electrodes are recessed into it on the obverse and reverse faces?

The DC source provides a bias and the pulse generator the signal, filters to make them play nice?

That sounds like a plasma speaker (ionophone).

Wikipedia
Plasma speaker - Wikipedia
Plasma speaker. Plasma speakers or ionophones are a form of loudspeaker which varies air pressure via an electrical plasma instead of a solid diaphragm.The plasma arc heats the surrounding air causing it to expand. Varying the electrical signal that drives the plasma and connected to the output of an...

[Logic]

Originally Posted by freebeard

I read the abstract and skimmed for a while. I guess the gray in the illustration is the dielectric? And the electrodes are recessed into it on the obverse and reverse faces?

The DC source provides a bias and the pulse generator the signal, filters to make them play nice?

That sounds like a plasma speaker (ionophone).

Yep. But that's just the super aero ideal in the drawing.
To test you'd just Pritt one strip on top of Kapton tape and take care to get another stuck parallel, to the bottom of the same tape.
Then the 3rd strip on top, with resistor attached.

Leave a gap and repeat.

Oh and much fun with tuft testing to decide where to put them and see what effect they have.
Like setting the tufts on fire!? for some impromptu smoke testing!

Oh and yes; if you feed one HV 'sound' it'll play your favorite tune!

[freebeard]

For the lurkers:

Pritt
German adhesive manufacturing company
prittworld.com
Pritt is a brand of adhesives, tapes, correction, and fixing products designed and marketed by Henkel. Pritt invented the world's first glue stick, also known as the Pritt Stick, which is a solid adhesive in a twistable casing. Wikipedia

[Logic]

Originally Posted by freebeard

https://www.newscientist.com/article...ound-to-space/

I hate barely tolerate the New Scientist's dynamic, unquotable PHP, but if you Inspect Element you find:


And I can get the picture from Google Images:


https://www.google.com/search?q=plas...6SD-UJRtJ_bkM:

That's interesting in that it looks like a lighter than air, helium filled, lifting body.
Then it seems it has air breathing Plasma jet engines attached!

Edit: Link Fixed

https://www.newscientist.com/article...ound-to-space/