Mark4211 wrote: ↑28 Feb 2018, 18:36
RS18 Exhaust-Blown Rear Wing
Source:
https://www.auto-motor-und-sport.de/for ... 69265.html
Renault has found a whole new trick to generate more downforce. The engineers assemble the exhaust as high as the regulations allow (550 mm above the reference plane). For this purpose, the tailpipe is bent upwards as much as is allowed (5 degrees).
The exhaust gases aim so from below on the main blade of the rear wing. It is specially coated on the underside so that the carbon structure in the heat jet does not start to melt.
The new trick is to bring up to two points downforce while accelerating. And the idea is not easy to copy.
(via Google Translate)
https://imgr4.auto-motor-und-sport.de/R ... 149523.jpg
Hi guys, a question for experts, from an idiot in aero.
Seems to me there are 2 possible effects of this blown rear wing :
1) dynamise, accelerate under flow, so create (continuously) an increased depression (DF generator).
2) disturb the underflow, detach it from the wing surface, and so segegate the over and under part of the flow (Drage Reduction System, remenber the f-duct)
Are these 2 options realistic /doable ?
Could be used alternately, for example 1) during curves, and 2) in straight lines ?
Could it be possible, that 2) uses a special engine mode (for example full ICE power mode ,wastegates full or widely opened) ?
If true, a) having ultra hot exhausts, and b) close wastegates (and sonic tubes) -bring closer, bring near, assimalted convergent flows-, c) just under the main tube to "leverage", "push" the main exhaust flow would help to concentrate the effect in the middle of the rear wing.
are all these (a,b,c) arguments right ?
And finally, a last question. Is it possible (compliant to regulation), to make d) holes inside tubes, to make a junction between wastegate tubes, an main tube. The idea here, is to create a kind of improved ejection angle (>5 degree), if the wastgate flow can exit upward through the main tube, creating a kind of "ray" able to target directly the middle of the wing ? ie achieve a ray for example from early in the wastegate through midlle of main tube d), to middle of wing (achieving 15 or 20 degree angle, so far better than the regulated 5 degree) ?
Thanks in advance for your feedbacks...