Dielectric-barrier discharge (DBD) for drag reduction

[Logic]

Pencil-on-paper flexible DBD

Doesn't get much easier than that for testing.

[freebeard]

Found one typo in Results and discussion (line 13) -- 'power' for 'powder'.

30 minutes Mean Time Between Failure?

We strongly believe...in emergencies, prototyping, or for education purposes.

[Logic]

Originally Posted by freebeard

Found one typo in Results and discussion (line 13) -- 'power' for 'powder'.

30 minutes Mean Time Between Failure?

I'm surprised it's even that long!
But it's cool that one can sit down with a pencil, ruler and paper, attach your 'doodle' to 'some static' and mess about with DBD.

It's just occurred to me that one might be able to 'ruler doodle' on empty plastic containers with one of those conductive pens for some longer lasting Sunday fun aero inquiry.

[freebeard]

The part that impressed me was using the bactericidal effects.

[Logic]

Originally Posted by freebeard

The part that impressed me was using the bactericidal effects.

Yep.
There's also the air ionization effect where pathogens and dust etc in the air ends up with the same charge as the air.
Meaning they are repelled by air molecules, rather than ending up with tiny ionically attached 'hot air balloons' and fall out of the air.

So air ionizers in some hospitals etc and in some aircons etc work on 2 fronts to a degree, but if you're breathing the air you don't want to produce much Ozone at all, although it is also heavier than air.

[Logic]

Premier Aerodynamics does a great job of reading/summarizing research for you, like this paper:
Effects of surface dielectric barrier discharge on aerodynamic characteristic of train

https://www.youtube.com/watch?v=taeAR_vsXUg

He NBs that the vertical DBD on the back of this train model is Reynolds number (Re) independent.


He does a whole lot of other aero tips and tricks videos that people here would like.

For freebeard

https://www.youtube.com/watch?v=flQ1VvtUpB4

https://www.youtube.com/watch?v=TVRp82iblk8&t=1236s

https://www.youtube.com/watch?v=seHA0XL-VBo

https://www.youtube.com/watch?v=zqCg8437KRI

[freebeard]

Thx. I should watch the other threee.

So... The points I take away is:

1. Front bellypan under the frame head.
2. Wickerbill across the hood to pull air down into that bubble in front of the windshield.
3. Those heavy bumper aren't helping at all ()
4. Rear fenders should fair into the door line.
5. Remove drip rail over [fixed] rear quarter windows

NB (as one might say) the Superbeetle had the spare tire laying flat behind the bumper and later a curved windshield to eliminate that bubble.

In the 1970s I drove a 1957 Beetle with the rear fenders bobbed to 24" (above the bumblebee deck lid). This was before I knew about diffusers.

[guudasitgets]

I should try that

[Logic]

On the classification of dielectric barrier discharge plasma actuators: A comprehensive
performance evaluation study

For a justification for the application of the flow control
system, an efficiency (in that case: effectiveness) greater
than 1 would be necessary. The analysis of the efficiency of
all components of the efficiency chain reveals an extraordi-
nary good saving rate of around 54, which means in other
words: More than 50 times the fluid mechanic power spent
for the boundary-layer control is saved in the propulsion
power.