A generic, Indy-type, open-wheel, racecar model was tested in a low speed, fixed ground wind tunnel. The elevated ground plane method was selected for the road simulation since one of the objectives was to allow flow visualization under the car (and this is not possible with current rolling ground wind tunnel setups). Consequently, both the groundplane and the wind tunnel floor were transparent to facilitate the flow visualization under the vehicle. The aerodynamic loads were measured by a six-component balance, and an effort was made to quantify the partial contributions of the various vehicle components. The main trends and aerodynamic interactions measured with this setup appear to be similar to data measured in larger wind tunnels using rolling ground simulations. As expected, the two wings and the underbody vortex generators generated most of the aerodynamic downforce. The very small rear diffusers allowed by the new millennium regulations are less effective than before, and their contribution to vehicle downforce is quite small. In terms of the drag force, the main contributors are the four large wheels, the two wings and the body's downforce induced drag.
I suspect mostly aesthetics.vorticism wrote: ↑12 Apr 2023, 21:37Still surprised they went with the CART/Champ car geometry, right down to the number of strakes. In more recent years Indycar ommitted the strakes and added a bargeboard while keeping the tunnel floor geometry.
http://www.mulsannescorner.com/LolaUnderbody.jpg
https://www.autodevot.com/wp-content/up ... rfloor.jpg
https://wp.usatodaysports.com/wp-conten ... b_0514.jpg
So basicly strakes are big vortex generators,that allow high diffuser AoA?(just like on aircraft wing they allow high AoA with out stall)Hoffman900 wrote: ↑12 Apr 2023, 20:27Strakes work for all types, flat floor and venturi tunnels. It’s all laid out here:
https://viterbik12.usc.edu/wp-content/u ... namics.pdf
Joe Katz did a lot of work on this around 2000-2002 and has several SAE papers on it. See pages 48-50 with accompanying text, illustrations, and figures. His illustration from the 2002 SAE paper looks conceptually very close to the current F1 floors.
The paper: https://www.researchgate.net/profile/Jo ... ion_detail
A generic, Indy-type, open-wheel, racecar model was tested in a low speed, fixed ground wind tunnel. The elevated ground plane method was selected for the road simulation since one of the objectives was to allow flow visualization under the car (and this is not possible with current rolling ground wind tunnel setups). Consequently, both the groundplane and the wind tunnel floor were transparent to facilitate the flow visualization under the vehicle. The aerodynamic loads were measured by a six-component balance, and an effort was made to quantify the partial contributions of the various vehicle components. The main trends and aerodynamic interactions measured with this setup appear to be similar to data measured in larger wind tunnels using rolling ground simulations. As expected, the two wings and the underbody vortex generators generated most of the aerodynamic downforce. The very small rear diffusers allowed by the new millennium regulations are less effective than before, and their contribution to vehicle downforce is quite small. In terms of the drag force, the main contributors are the four large wheels, the two wings and the body's downforce induced drag.
Is that the Sauber windtunnel model? Sidepods look odd. Or maybe it's the show car?
