Closed vs Open Wind Tunnel

bafcat · March 22, 2020, 13:42

Hello,

I have a question related to wind tunnels.

What is the difference in the lift generated by a finite wing inside a closed and an open test-section wind tunnel? And respect to a hypothetical infinitely big wing tunnel?
I think that the lift in the closed wind tunnel will be the lower (due to wall interference), instead, it will be a bit higher in the open wind tunnel and the highest will be in the infinitely big open wind tunnel right?
Can someone explain to me if is it true and why?

Regards,

Thomas

wkernkamp · February 5, 2023, 01:03

The lift will be lower, the more open the flow. Think about a wing in ground effect: It has more lift at a given angle of attack. The more the induced flow about the tip is impeded, the higher the lift.

March 22, 2020, 13:42	Closed vs Open Wind Tunnel	#1
bafcat New Member Thomas Kath Join Date: Mar 2020 Posts: 1 Rep Power: 0	Hello, I have a question related to wind tunnels. What is the difference in the lift generated by a finite wing inside a closed and an open test-section wind tunnel? And respect to a hypothetical infinitely big wing tunnel? I think that the lift in the closed wind tunnel will be the lower (due to wall interference), instead, it will be a bit higher in the open wind tunnel and the highest will be in the infinitely big open wind tunnel right? Can someone explain to me if is it true and why? Regards, Thomas

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February 5, 2023, 01:03		#2
wkernkamp Senior Member Will Kernkamp Join Date: Jun 2014 Posts: 372 Rep Power: 14	The lift will be lower, the more open the flow. Think about a wing in ground effect: It has more lift at a given angle of attack. The more the induced flow about the tip is impeded, the higher the lift.