I have for some time been thinking that you could use the ejector prinsiple to prevent the wing from stalling.


In other words.. Make it possible to have a even more aggressive angle of attack on the wings.

What you do is that you suck the air on the backside/underside of the wing into it so you get low pressure on the backside/underside. that way the air going in get sucked up easier/becoming more capable of chancing its direction faster.

Or you simply raise the pressure difference on the wing. win-win.

How do you generate the suction? you use the exhaust gases that feeds the diffuser. Having a odd shape on the exhaust is allowed i think as long as its only two outlets.


Im not sure if its still allowed to stall the rear wing/have a opening in the wing tho.

Besides it could be applied to more than just the wing.
And you can still blow the diffuser.

Any thoughts?

You would be sucking the air in through the undersurface of the wing, when you want that air to speed along the surface and create a pressure difference to the upper surface. You will reduce the velocity difference between the upper and lower surfaces.

You are introducing leaks through the wing !

Disagree.. same amount of air goes into the wing underside but then you also remove some of it to vacuum->lower pressure. you could depending on the position of the inlet make it possible to have a bigger radius on the wing profile, as the normal vortex that comes when you have a chubby wing stalling in high speed is getting sucked in/closer to the profile. making it meet the upper air at higher speed before it stalls.

Im no expert so i dunno much about wing profile thicknesses and ideals relative to speeds.



And you could also use it other places than at the wings.. say underneath the front nose. short route for the Renault guys.

What you are looking at is very similar to the "live steam injectors" or exhaust steam injectors" used from time immemorial in steam locomotives to get water into a boiler under pressure. They were used instead of mechanical pumps as they were more reliable.

I think if you google the topic there should be a lot of existing analysis of how they work and the performance. They had to work against 250 psi by the way.

Cool.
Ill be looking into it.

Assumes you can get some pretty decent vacuum with those then.

thoughts about the above mentioned idea?

Mats a starting point

http://en.wikipedia.org/wiki/Injector#Mult..._steam_ejectors

An interesting reference is to using latent heat to increase injection pressure.

A similar idea is an eductor, which uses a small jet of high pressure air to accelerate a large volume of air. We use these on engine dynos to get a blast of cold air, using the workshop air as a high pressure feed.