Brake Ventilation Air Duct Design

[RS3DG]

Hello. I am not an engineer, please forgive if I ask an ill-informed question.

I am currently designing Brake Duct parts, that I plan to print and use on a track car. I am planning an Inlet in the front bumper (high pressure I believe) and directing it back to the center of the brake rotors.

My question is there anything I can design with the surface of the walls or in the center of the tube that would help increase the air speed inside the tube. I am remembering years ago when Miller Lite advertised a 'Vortex' neck that made for a smoother pour, and also when you spin a bottle with fluid in it, you can get the fluid out of the bottle faster. Not sure there is anything I can do to improve the airflow, just thought I would ask.

Thank you for any replies.

 

[Baluncore]

Welcome to PF.

Keep the walls smooth,
Avoid sharp bends or sudden changes in diameter.
Curve the inlet and outlet like a trumpet to reduce the vena contracta.
https://en.wikipedia.org/wiki/Vena_contracta

 

[berkeman]

I am currently designing Brake Duct parts, that I plan to print and use on a track car.

Do you think your brakes are overheating? What kind of track car / racing is this for?

Paging @Ranger Mike

 

[Ranger Mike]

I can absolutely testify that you need to cool the brake rotors! Yes , get fresh air to the rotors and increase the pad life. A Nascar or similar full body car will have 1200° F heat on the right front wheel in a 30 lap race. Heat is a killer on brakes so the more you can do too cool them the better.
Do not worry about vortex, aero dynamic principles, get as much outside air the rotors as possible without introducing more aero drag!

 

[RS3DG]

Thank you for the replies!

 

[Ranger Mike]

from Carroll Smith book - Prepare to Win
I used Styrofoam from the hobby store and made my brake ducts. I covered it in fiberglass.

 

[RicoGerogi]

Smooth walls and easy bends help air move better through the duct. Tapering it a bit can speed up the airflow to cool the brakes more. Spinning the air sounds cool but it usually just makes things messy... so straight and simple works best.

 

[Lnewqban]

I am currently designing Brake Duct parts, that I plan to print and use on a track car. I am planning an Inlet in the front bumper (high pressure I believe) and directing it back to the center of the brake rotors.

Welcome!

Please, see:

 

[RS3DG]

Thanks again for taking the time for the replies, it helps.

The one shared video shows what I have on a 2018 RS3, and I'll be looking to do more with this car later. For now, I working on a 2010 Miata, I have a number of parts already and I am basing the solution on Corvette Z06 ducts as a starting point.