Cooling air flow: Backward rather than downward.

[Logic]

So you have cooling air flowing into the engine compartment, through the radiators etc.
Then where does it go?
It can't flow in if it cant flow out right. That's like you trying to blow through a snorkel or something with your hand over the other end.
Well usually its exit is out underneath the car.
And that's where this paper comes in.

Basically it says that when you put in your smooth under-body panels you want to leave an exit vent that flows that air out backwards under the car, not downwards.

The where and how big the vent should be I'll leave to the paper. and you all to discuss as it's... well; advanced aerodynamics and well above my pay grade.
https://sci-hub.ru/https://www.scien...89430497000647

Perhaps side vents are a better option? Or that aero shaping behind the wheel well story?

I will add that the Meredith Effect is interesting: (thrust from radiators/heat)
https://en.wikipedia.org/wiki/Meredith_effect

Here's another paper on all this:
https://sci-hub.ru/https://www.jstor...table/44745485

(Sci-Hub 'frees' paywalled papers to us tax paying citizens , but many ISPs seem to have been bribed or something into flagging Sci-Hub as a malicious site:
If you run the URLs through VirusTotal (and others) it isnt.
https://www.virustotal.com/gui/home/upload

If you're having trouble; say, and we can get into bypassing their BS)

[aerohead]

I'll add one more.
Mercedes-Benz recently published that at Cd 0.1716, their Vision EQXX concept BEV sedan had no requirement for internal cooling airflow, and could rely on IVECO's cooling plates instead.

[freebeard]

Traditionally, up and back.

www.jalopyjournal.com/forum/attachments/img_2515-jpg.4444574/

[Logic]

Originally Posted by aerohead

I'll add one more.
Mercedes-Benz recently published that at Cd 0.1716, their Vision EQXX concept BEV sedan had no requirement for internal cooling airflow, and could rely on IVECO's cooling plates instead.

IVECO's cooling plates? Skin cooling?
I did have a quick look but no luck.

[CigaR007]

Originally Posted by Logic

IVECO's cooling plates? Skin cooling?
I did have a quick look but no luck.

I think aerohead is referring to battery pack cooling plates.

IVECO seems to be a brand/manufacturer.

https://duckduckgo.com/?q=battery+pa...ages&ia=images

[freebeard]

Knowing aerohead, he could have been thinking of Frank Lutz's Stutz Blackhawk:


oldmachinepress.com/2013/02/23/lockhart-stutz-black-hawk-lsr-car/

[aerohead]

Originally Posted by Logic

IVECO's cooling plates? Skin cooling?
I did have a quick look but no luck.

We might as well call it that!
The heat exchange matrix is bonded to the 'inside' of the 'plates.'
IVECO exhibited a 'Glider', semi-trailer tractor in Europe a decade or so ago, which had no conventional cooling system. Side 'pods' incorporated the thermally bonded coils, just as flat-plate solar hot water panels employ, and airflow 'licking' the surface is sufficient enough to carry the heat flux away.
My Energy Star-rated Kitchenaid refrigerator uses this 'coil-less' technology.

[Piotrsko]

Bad news, @aerohead, the coils are now under the fridge skin but not bonded to it. You will see a requirement for airflow around the unit and in addition, the tops , side are warm to the touch.

[Logic]

Looking at the pressure over a car's body; the lowest pressure is the front of the roof.
(Easy to see where a radiator vent should exit too)


So here's a crazy A-Pillar Vent idea and questions:
Why not use the hollow A pillars to vent the engine bay (some) up to vents in the front of the roof?
If the vents are properly designed aerodynamically, wouldn't that suck some of the air out of the engine bay, reducing flow and pressure under the car and reducing lift and drag? over the car?

The roof vents would have to be properly aerodynamically designed and the ducts water tight and able to drain.
I have no idea what the ducts would look like for best aero??

There are plenty of aftermarket roof and hood scoops but I'm guessing that properly placed, sized and shaped slots in the roof, with a similarly well designed vent under the roof..?

aerohead?

[freebeard]

A sizable duct would obstruct the driver's vision.

A small, long duct would have excessive skin friction.