2012 Exhaust Blowing & Coanda

[Adrian Newby]

If their EBD doesn't work well enough, Red Bull seem to be more fully invested in it than the other teams and will therefore pay a larger price for their mis-step.

[Crucial_Xtreme]

If their EBD doesn't work well enough, Red Bull are more fully invested in it than the other teams and will pay a larger price for their mis-step.

Actually if it doesn't work as well as they intended it to, I think they'll revert back to the launch position and probably be fine. It seemed to work well. It's nice to have options.

[MIKEY_!]

Is this legal? Using the Coanda effect to lower the exhaust stream out of the FIA defined cone and use slots in that surface to collect exhaust gas and channel it to the diffuser?

[Adrian Newby]

you do know that the dosnt shine out of adrian neweys you know what he has copied and twisted mclarens and saubers idea simple as.

You keep thinking that.

[Adrian Newby]

What makes you think RB has compromised the airflow around the rear of the sidepods?

Is this not a compromise, the flow splitting and going to two different locations.

Brian

The flow doesn't follow both of those paths at the same time. The default is to go to the floor/diffuser. Only at the highest speeds will it get blown back down the ramp.

[Crucial_Xtreme]

The flow doesn't follow both of those paths at the same time. The default is to go to the floor/diffuser. Only at the highest speeds will it get blown back down the ramp.

Do you think? Let me ask you a question. Which flow is greater(in terms of amount of flow) and which flow is stronger, the flow over the sidepods or the flow around the sidepods?

[horse]

The flow doesn't follow both of those paths at the same time. The default is to go to the floor/diffuser. Only at the highest speeds will it get blown back down the ramp.

Really, how do you know? Without actually asking the designer and seeing the testing results how can anyone be sure?

I think the canal after the exhaust exit is misleading. All it can do is impart some twist, perhaps.

Where it goes after that, I'll be damned if anyone can persuade me with photoshop.

[Adrian Newby]

The amount of flow from the exhaust would depend on the engine rpms. The flow down the ramp will have a greater velocity because the surrounding flow will always be at the highest speeds.

[Adrian Newby]

The flow doesn't follow both of those paths at the same time. The default is to go to the floor/diffuser. Only at the highest speeds will it get blown back down the ramp.

Really, how do you know? Without actually asking the designer and seeing the testing results how can anyone be sure?

I think the canal after the exhaust exit is misleading. All it can do is impart some twist, perhaps.

Where it goes after that, I'll be damned if anyone can persuade me with photoshop.

It's all just conjecture, isn't it? We are just taking our best shots at what makes the most sense to each of us. This makes the most sense to me (that, and I hacked into n smikle's super-private CFD results).

[bhall]

[My comments made much more sense within the context - and thread - in which they were posted. In the future, please delete my comments outright if they're summarily deemed immaterial to their respective discussions rather than move them and render the thoughts completely neutered. Thank you.]

[cossie]

supposedly and i use thaqt word very lightly in this case , the redirection and collection of the exhaust is prohibited alonjg with any rear exhaust blowing , but who knows what the f knows what the FIA will do about it

[MIKEY_!]

Can anyone tell me what the regulations ban collection and redirection? I have looked already and found nothing.

[Adrian Newby]

OK, so the flow starts out going to the vortex area at normal cornering speeds, right?

But the faster the car goes, the more the flow is going to try to go (get pushed) farther aft.

But the design of the sidepods, bridge, etc., keep the flow going to the vortex area.

But at some speed (greater than cornering speed), the flow will no longer make it to the vortex area.

So, at that speed, the flow switches to the other side of the "exhaust splitter" (my term for the area just behind the exhaust channel) and flows down the ramp, causing less drag for the straightaways.

Additional info: This doesn't have to be an all or nothing, "hard" splitter for all the flow. The transition from one path to the other could indeed have some percentage of the flow going both ways, but only at the transition speed range.

[flynfrog]

Can anyone tell me what the regulations ban collection and redirection? I have looked already and found nothing.

how on earth do you plan to collect anything in an open free stream environment. redirect sure but no way you will collect anything.

[Adrian Newby]

If you believe the diffuser is being blown, then it is either being blown for the entire speed range of the car (more difficult), or it is not being blown for the entire speed range of the car (easier).

If it is not being blown for the entire speed range of the car, then you can either accept what happens, when it happens, or you can try to dictate how and when it happens.

If you are Adrian Newey, I think you do the latter, and try to get a little something extra out of it in the process.