Internal Body Aerodynamics

I believe they are basically centrifugal compressors. Early and/or cheap centrifugal compressors had/have straight vanes.

https://en.m.wikipedia.org/wiki/Centrifugal_compressor


I am guessing he found a stainless salad bowl approximately the right size and went from there.

We had a thread on the original alloy fans, I seem to remember they were flat on the front, but alloy would support a lot more torque. It was just uploaded, so it will be interesting if he gives an update later.


Found it:

http://www.vettemod.com/forum/showthread.php?t=10716&highlight=Wheel+fans

rtj said:

I believe they are basically centrifugal compressors. Early and/or cheap centrifugal compressors had/have straight vanes.

https://en.m.wikipedia.org/wiki/Centrifugal_compressor


I am guessing he found a stainless salad bowl approximately the right size and went from there.

We had a thread on the original alloy fans, I seem to remember they were flat on the front, but alloy would support a lot more torque. It was just uploaded, so it will be interesting if he gives an update later.


Found it:

http://www.vettemod.com/forum/showthread.php?t=10716&highlight=Wheel+fans

Click to expand...

I still don't think that does anything other than churn air. Its not even centrifugal, and if it was, its backwards. This is from the link you provided:

Impellers are designed in many configurations including "open" (visible blades), "covered or shrouded", "with splitters" (every other inducer removed) and "w/o splitters" (all full blades). Both Figures 0.1 and 3.1 show open impellers with splitters. Most modern high efficiency impellers use "backsweep" in the blade shape.[6][18][19]

Euler's pump and turbine equation, plays an important role in understanding impeller performance.

https://images.app.goo.gl/oa4QKXYgGfSHnXFh6

Prochargers had radial blades for a long time I believe (economy models). Found a p600 photo here: https://www.modularfords.com/threads/81972-Procharger-rebuild-finally-finished!#/topics/81972?page=1

You want a limited amount of flow, as flow requires power. So inefficient straight blades might be good enough. Plus, too much load might damage the light weight wheel fan.

“radial blade centrifugal fan“ this search gives lots of images.

If you've poured a cup of 'nog, here is a sleigh that would delight any Santa.

This Ferrari looks vaguely similar (well a bit) to the C8 but less angular and maybe a bit more front end from the concept days:

I bring it to the thread as there is a very interesting bit that is clearly applicable to early model C3s (Note the "helper" airfoil that could be mounted just aft of the T-Top between the C3 flying buttresses - a better position than my sketch in a previous posting):

The article is from last year, but features a number of very interesting aero features and each is highlighted and I won't blather on about them all. But, this is an interesting approach on the rear:

The wing is in an area to expect clear air, and mounted on top of the spoiler/slot gets the added "boost" of being in a "ground effect" from the spoiler surface. Sort of almost like a bi-planer setup.

A good shot of both features at once:

Overall-some very sexy curves and another example of what can be done is you can spare no expense!

20 pics here: https://www.cnet.com/roadshow/news/ferrari-p80c-one-off-track-car/

As an aside the Lotus Evija (electric) shares some similar flow-schemes:

From an INTERNAL BODY AERODYNAMICS perspective - the above diagram show the concept of "porosity" that was seen in the Bugatti earlier.

[ame]https://www.youtube.com/watch?v=fqbZ36zw0Kk&feature=emb_logo[/ame]
It is described as a car that; “...literally breathes the air”. They say the focus has been on balancing downforce, lift, and stability. They also say the secondary focus is drag - and they have yet to release those numbers (I haven't found anyway.) But, with 2000HP, drag is not much to overcome!

Cheers - Jim

That’s pretty neat, nice aero vid. I never realized until now that high performance electric vehicles needed cooling, but it makes sense that in addition to low drag and high down force, they also have to cool properly.

One more, but the one thing on this car that stood out was how they try to clean up the flow off the front wheels. Jump to 8:00 if you get tired of him talking.

[ame]https://www.youtube.com/watch?v=GY5Fil-FPm0&t=507s[/ame]

More realistic or real world cars in these two:

Low budget(but informative):

[ame]https://www.youtube.com/watch?v=TKH1DyV9vNU[/ame]


Big buget!

[ame]https://www.youtube.com/watch?v=wjUaQASt_hc[/ame]


I always liked flow vis.

Some good internal aero discussion in this one. This Porsche channel looks good, but I won’t post many more.


[ame]https://www.youtube.com/watch?v=FbaXakB4qWo[/ame]

[ame]https://www.youtube.com/watch?v=2o7Nub56YRc&t=202s[/ame]

Here is graphic evidence of the downforce that the Viper ACR's wing produces. Start watching from 1:50.

https://youtu.be/PUodFjt01CY

I always wanted an ACR and drove down to Miami to look at a low mileage car. Just hesitated long enough and life changed .

Great video, that really put the rear down fast.

https://www.jegs.com/i/AR+Bodies/04...riteo&utm_medium=cpc&utm_campaign=retargeting

This photo is from the video Ozgreen posted and looks similar to the jegs part at the link. Greenwood tribute car by Hendricks.



Another.
https://www.jegs.com/i/Five+Star+Ra...riteo&utm_medium=cpc&utm_campaign=retargeting

At 3:00-5:00 he discusses aero. He explains the dimples. I thought they were passive from the other video, deploying on their own due to low pressure (don’t know why), but it appears to be active.

[ame]https://www.youtube.com/watch?v=WTF4ACavd1w[/ame]

[ame]https://www.youtube.com/watch?v=AAYqrDUxTiY[/ame]

Enormous fender vents.

[ame]https://www.youtube.com/watch?v=PhACfJZhIMg[/ame]

Pretty interesting, amazing how a CF wing with foam core is so strong.

[ame]https://www.youtube.com/watch?v=UEcfVIVndek[/ame]

^^^^^^^^^

Pretty amazing. But I had to laugh - with all that hi-tech equipment, when it came time to test the strength of the wing they used a foose ball table to support one end.

Yes mfain, kind of an interesting video, some sort of startup business.

This carbon fiber wing below, is pretty unbelievable. I guess when your r&d budget is huge, anything is possible.

[ame]https://www.youtube.com/watch?v=0rtzM-IUAx8[/ame]

Lots of engine setback allows rad ducts in the camaro. He’s got the swan neck supports on his wing.


[ame]https://www.youtube.com/watch?v=aSSYUdqx69o[/ame]

rtj said:

Lots of engine setback allows rad ducts in the camaro. He’s got the swan neck supports on his wing.


https://www.youtube.com/watch?v=aSSYUdqx69o

Click to expand...

Good video. I have been watching this car in development for years - from early Optima to present. On his hood vents for the radiator, notice the "lips" in front of the discharge holes - provides a low pressure area to help extract the air more efficiently. I am doing something very similar. My engine is well back, so lots of room. Here is a construction shot of the buck for my carbon fiber hood. It has a raised lip across the front (a lot like a '68 big block hood) that will create a low pressure area behind it. The center cowl hood gives me lots of clearance for a large air cleaner on top of the throttle body and very tall fabricated intake. There is duct work built on the bottom of the hood that carries ram air from in front of the radiator (duct goes above the radiator and below the hood skin) back to a box around the TB. I will also put a flapper valve in the back of the cowl that will open if high pressure from the cowl-windshield area exceeds the ram air pressure. Not sure how that will work out. There are outlets on either side of the cowl that exit air from CF ducts that come from the back side of the radiator.

Looks like you have gained lots of CF fab experience building that car. I’m always amazed by CF parts people make.

YouTube isn’t offering many aero suggestions, but this one popped up lately.

I’m actually impressed by F1 cheating efforts, I hadn’t heard of oil burning before. Looks like the rules committee is working on cleaning up wheel turbulence, among other things.

[ame]https://www.youtube.com/watch?v=7nxsT-dey20[/ame]

Pappy -
As always, NICE work.
Just a tip: a pretty good Rule of Thumb on Radiator Duct Design:

I suppose that is something that can be "trimmed" out - which is how I'm planning, a bit of foam, test(?) then 'glass in the shape. Nice catch on the leading edge "lips" on the Camaro's radiator "snorkels" - a nice homage to Dan.

Cheers - Jim