Wind Tunnel Testing Round 2
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- Race Louvers wind tunnel video: • We Go To The Wind Tunn...
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I could nerd out to this stuff for hours. Excellent information
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Seeing how the hood vents actually work was very interesting! The air going into the top of the grill gets pulled right out from the high pressure air flowing over the hood vents pretty consistently.
Wondering if the side by side style of this car of the horizontal opening going across the front of the hood is a more effective design for heat extraction?
Very cool testing!
Very good video AJ. The changes I saw when I started taping the "holes" between splitter, airdamn and other thigns on the bumper the difference was huge on track. Like 1-2sec per lap huge. The car suddenly had front downforce (it felt like it had none before that).
I need to do more of these on the Prelude, I feel like I can get a lot more downforce up front!
@@matsrebuild3511 You can always ask. I have tried about 4 different configurations already. I have a general idea of what works and what doesnt.
Thanks for sharing this video. So much useful info. Now, if I only knew how to understand it.
AJ, thank you for the awesome vid as always. Very informative
thank you, it helped me a lot with different theories that i have and needed some answers, also what program do you use for CFD? and what kind of computer do you run it?
Just looking at the car w/ that massively long splitter, I would never guess it'd have front end lift. That's why we test & validate. Did you consider lengthening the splitter end fence you created to the bottom of the 1st or 2nd dive plane? Or even something like the C7 Z06 Stage 3 splitter end fence?
En tangled would have liked to but came down to available time so didn’t get a chance.
@@ajhartmanaero Thanks for the reply. This video was so fascinating.
This video makes me both excited and weary of playing with splitters and aero. The wind tunnel testing really highlights that only so much can be done on CFD if something such as the angle of the splitter is off and is creating lift and not downward forces. Thanks for the vid!
The splitter was only a small contributor to lift since once we got some angle into it, we finally made some downforce. The radiator not being ducted allowed copious amounts of air in the engine bay and under the car causing a lot of lift.
AJ Hartman Aero Did the car not have a flat bottom?
@@GoodWillRacing It did not.
I’m a super huge nerd for this kind of stuff
It seems the front bumper side vents not helping the radiator and guide the flow attachment to the tire block (and bodywork).
Great content overall in your channel. At what angle relativrly to the ground did the front splitter start to make df?
Its not quite that simple cause with side plates, ducted radiator, large louvers, etc, we could have made more Df without changing the splitter angle. So since the tunnel measures total Df, it hard to say just a splitter angle change will be the only change to downforce. But generally you want the splitter atleast level, if not, nose down a tiny bit.
Nice job man, but just a question: Downforce negative it mean that it push up? 😅
yes.
Best channel ever!
How about that AERO Bible you collected & have as a resource ... epic. I normally Just keep a collection of magazines as opposed to the articles themselves. Cool to see that and the downforce from little blocks up front. still room for improvement. The M style side mirrors I feel would help alot guiding the vortices.
I have a tiger racing hood for my s550. It isn't drilled for the rear OEM rubber gasket. Should I install it without the gasket/seal?
Chris Bouchard I’d put the seal on if you can.
This is SUPER cool!!
great video
what are your thoughts on wheel well diversion plates to direct the air from the side of the bumper and canards up and over the wheels & tires? looks like at 11:15 the air is hitting the wheels
I'd run them if it were my car.
What magazines are those found in?
Great video AJ you know that renick performance front splitter, side skirts and rear diffuser I have on the Camaro, maybe we can get that down North Carolina to see if those products are really effective something to think about?
Let me know
Shoot me an email if you go. I'd love to go back just to help out. ajhartmanaero@gmail.com
@@ajhartmanaero Thanks, Don't forget we supposed to work on the rear wing, unless you want to do a front splitter 1st to help out with the front down force, let me know I will email you.
RacerXXX / Only racing will do! Email me.
My dream job. If I were in the United States, I would definitely be in this line of work.
Would be cool to work there. I just get to take cool cars there.
does blocking off the cowl at the windshield make the hood vents more efficient?
roastbeefoffroad it should. It’s one of those very rare occasions where we gains downforce AND lost drag.
@@ajhartmanaero nice. how is drag and downforce gains and losses calculated in a wind tunnel? does the car sit on static scales or something?
Can't understand why you want so much turbulent airflow around the sides of the tires?. As far as the louvers, as you go towards the windshield, your louvres need to be higher. As air flows out of the Louvre, it either lifts or interrupts the high speed flow.
Mayhaps I'm just confused, but your methods are correct, but your deductions and understandings are all over the place???
You don’t “want” turbulent flow around the tires, it’s just how it is. As for Louvers, I’m pretty sure you are confused. Taller at the front and shorter towards the rear provided better results.
Cool vid. How fast was the wind when using the smoke wand? Do you think the static floor invalidates learning about the bottom of the car and the diffuser? Have any idea what the wind tunnel bill is for this? Thanks!
30mph during the smoke. Static floor isn't the best but still would see changes if we were to do some underbody tests.
AJ Hartman Aero static floor could change the splitter results as well right?
sjpro1 yeah but not as much since it’s the first thing the air hits.
Good stuff
How much does wind tunnel time cost?
$500/hr
That splitter desperately needs endplates on the sides, like an infinity wing setup, and double the angle of the canards.
The upward angle of the splitter would actually help accelerate the air underneath the front end to lower the pressure. You just need the endplates to gain positive pressure on the top, otherwise the splitter isn't really doing anything.
We did side plates on our latest tunnel video. This customer didn’t want to run them. Your second part is false tho. Since it’s a flat splitter leading to a dirty floor, the upward angle was not good. If it was a profiled splitter leading to a flat floor, an open throat to the splitter is beneficial. Details matter.
0:37 Bruh, Thats Jamills Intro
I’m sorry did you say 2050lbs?!?! With a full cage?!?!
Time stamp of when I may have said this?
@@ajhartmanaero that’s weird I commented that on a completely different video idk why it’s even here lol sorry for that
Are you an engineer?
No.
I’d say he is.
Maybe an s duck like latest Ferrari car will generates more front downforce.
maybe.
Not sure if an S duct is the same as an S flap, but that's what I was thinking when I saw you block the lower corner of the tire. I know McBeath did a full height S flap in front of the tire that went all the way up to the top of the fenderwell on a BTCC Civic I think, and they tried ramps in front of the tire and then the flap and he was surprised that the flap worked better than the ramps. Anyway, think that would be better than the little 3" flap on top of the splitter. If the car has fenderwells and it's legal, could cut them out in front of the struts to allow air out of the engine compartment too.
Air looked really dirty over the rear window too during the smoke testing, like there was a lot of flow separation. VGs might help that situation. Video didn't really show where the separation started, but I'd think you'd want VGs significantly forward of where they are on EVOs due to curvature of the roof.
Loved the video. Thanks!!!
@@jonmortensen9990 Yeah we would have loved to play with different size and shapes S flaps but it all comes down to time. I literally found some scrap foam in the back room to fab those up in about 2 minutes. The test you are mentioning I think was in one of McBeaths books cause I remember that exact one. As for the dirty air off the roof, if you look at the guys eyes doing the smoke he looks forward in the tunnel a few times. Since the test was done with the FSAE team there was a lot of people in the tunnel. I think we were causing some of that, especially cause when you see the smoke hit the center of the wing just before the video cut it does get good clean air for a bit.
@@jonmortensen9990 no Ferrari s duct is not same with s flap that you mentioned. Try to look out for Ferrari gtb / 488 pista aerodynamics videos.
Ah, I see, rad duct out the hood. Yeah, I agree, that would improve things a lot. Hadn't heard of S duct. Thanks!
Do the front tire blockers/tire spats help even if you don't have a front splitter? like this: racebredcomponents.com/products/racebred-components-universal-front-tire-spats
My guess would be yes, but not as much.
This isn’t accurate at all. Your tires aren’t rolling. Changes everything with downforce
Thanks. We didn’t think of that!
It's better than nothing
In this tunnel they can plug in speeds and see what your calculated lift or down force is, watch cleetus McFarlands video the guy explains it in great detail. For example he needs an extra 500 HP to maintain 170 mph because his step is so bad