Forces On Toroidal Wind Tunnel wihen Wing is attached inside?

[StoyanNikolov]

Consider the attached Toroidal wind Tunnel.

The Wind tunnel is in Vacuum and the moving air and the attached wing are only inside the toroidal tunnel.

Will the mounted wing on the walls of the tunnel experience force and move the Toroidal tunnel as shown in the picture.

Thank you.

 

[Genady]

The wing will experience force. The center of mass of the system will not move.

[StoyanNikolov]

6 minutes ago, Genady said:

The wing will experience force. The center of mass of the system will not move.

Will the system move in some direction ?

If not , Can you give some simple explanation.

Thank you

Edited May 9, 2023 by StoyanNikolov

[Genady]

1 minute ago, StoyanNikolov said:

Will the syste.m move in some direction ?

Of not , Can you give some simple explanation.

Thank you

It might change position, orientation ... But the center of mass will not move because the total momentum has to be conserved.

[StoyanNikolov]

Just now, Genady said:

It might change position, orientation ... But the center of mass will not move because the total momentum has to be conserved.

So the part of the torus, where the wing is attached will start moving as shown in the picture ?

[Genady]

2 minutes ago, StoyanNikolov said:

So the part of the torus, where the wing is attached will start moving as shown in the picture ?

I guess it will.

[StoyanNikolov]

Thanks for the Reply. Hopefully someone , who knows 

for sure will write too.

[Genady]

Does it have anything to do with Astronomy and Cosmology? Looks like Classical Physics to me.

5 minutes ago, StoyanNikolov said:

Thanks for the Reply. Hopefully someone , who knows 

for sure will write too.

Do you have any objection to my answer that the center of mass will not move?

Edited May 9, 2023 by Genady

[StoyanNikolov]

8 minutes ago, Genady said:

Does it have anything to do with Astronomy and Cosmology? Looks like Classical Physics to me.

Do you have any objection to my answer that the center of mass will not move?

If someone knows how the system will move? Does some part of the system will start moving?

24 minutes ago, Genady said:

It might change position, orientation ... But the center of mass will not move because the total momentum has to be conserved.

Which part wich change position and in what direction?

Thank you.

[Genady]

Ah, you're looking for somebody who just knows the answer...

Edited May 9, 2023 by Genady

[StoyanNikolov]

8 minutes ago, Genady said:

Ah, you're looking for somebody who just knows the answer...

Opinions are very welcome,

but the opinions with certainty are preferred.

Edited May 9, 2023 by StoyanNikolov

[Mordred]

!

Moderator Note

Moved this thread to classical physics, as the problem is classical in nature.

 

The wing will snap where it's mounted while the wing will want to thrust upwards it would be unable to do so as the positive pressure below the wing is pushing downward on the toroidal containment wall which in turn will try to thrust downward in response while the wing attempts to thrust upward.

It would be similar to placing a plate behind a fan. The fan would push down on the plate however the plate won't move as the fan is attached to it.

 As far as pressure differentials your specified a vacuum outside to toroidal wind tunnel so you wouldn't have a preferred direction for the positive pressure to flow to a lower pressure potential. The containment walls themself also prevent the positive pressure flow to reach a lower pressure potential. As there is no path you wouldn't get any thrust as a result of pressure differentials.

A simple experiment to validate the above. Place a water hose with a gate valve on a scale. Measure the weight with the hose filled with water but not flowing. Then measure with flow. You won't see any difference.

Edit butterfly valve not gate valve lol.

Edited May 9, 2023 by Mordred

[Genady]

Curious mental experiment:

Imagine that the torus is made of a fabric, like a sock closed on itself. With the wind and the wing as described, will the sock be turning around the circular axis inside the torus? (Does that axis have a name?)