Questions tagged [vortex]

Questions about vortices (channels of swirling air) generated by aircraft, which can be either desirable or undesirable.

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How does vorticity change the lift coefficient of an airfoil?

For airfoils in unsteady motion, the lift coefficient oscillates and the wake is characterized by vortex shedding. How does vortex shedding affect the lift coefficient for an airfoil?
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1answer
172 views

What is the role of a bound vortex?

From what I know the term bound vortex comes from potential flow theory and is a part of circulation around a wing. Does it mean the same as circulation or lift? Is it a cause of generating lift over ...
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2answers
227 views

Why does the Biot-Savart law give the induced velocity of a infinitesimal segment of a vortex filament at point P?

My question is about the proof of how the Biot-Savart law can be used for vortex filaments. This is what I have in my textbook: However, I'm not certain how it was derived - I understand that the ...
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2answers
285 views

Are there any aircraft with retractable vortex generators?

From this answer, “Of course, these also add drag, even when the wing is not stalling, so they are only added where needed”. Are there any aircraft that have vortex generators that are retractable so ...
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What is the reason for circulation of air around an airfoil? Based upon the circulation of air, why are airfoils shaped the way they are? [duplicate]

Foreword: I am an Aerospace Engineering student and next year is my third and final year, starting September 2019. I was taught approximately 2 semesters ago that the correct theory of lift is that ...
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1answer
180 views

How do the vortices of a fixed wing and horizontal stabilizer interact? [duplicate]

What interaction of vortices between the fixed wing and horizontal stabilizer? How do the vortices affect the flow of the horizontal stabilizer upon leaving the wing? when will the downwash effort ...
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2answers
631 views

Does an aircraft with higher aspect ratio wings produce more wingtip vortices in a turn than one with lower aspect ratio wings?

The Ta-152H was well-known for having very high-aspect ratio wings: 8.94, if I'm not mistaken. Now, compare this to the P-51 which had, if I'm not mistaken, an aspect ratio of 5.86. Does this mean ...
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1answer
281 views

What's the shape and place of the tip vortex in a propeller, depending on propeller sense of turning?

If the propeller vortex is placed and has changing features depending on the propeller sense of turning, both in traction and pusher configuration, knowing about this may have an interest for the ...
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2answers
525 views

How and why do wake vortices come together to form two tip vortices?

Wake vortices are created all along the wingspan but, the vortices come together to form two tip vortices. How exacly does this happen and why does it? I know that wake vortices push air to the side. ...
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0answers
74 views

How to derive the Vortex line segment parallel to a plane using the Biot-Savart law?

I am trying to understand what is shown in this book (Applied hydro and aeromechanics), page 187 The velocity induced at a given point on a parallel plane by a vortex segment of length $b$, and ...
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242 views

What aspect ratio is best for Wind Tunnel Testing an aerofoil with Small Additives? [closed]

Vortex generators will be 3D printed on a panel, which is then to be slotted onto a foam aerofoil to be tested in the wind tunnel for performance and flow physics. What I want to know is which aspect ...
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2answers
3k views

Can these vortices be dangerous?

There is a question related to this one right here but I'm more interested in the danger of those vortices. Are they very dangerous to cause a wake turbulence for the aircraft that comes behind this? ...
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2answers
3k views

What is the working principle of gravel kits?

In this answer gravel kits are mentioned. I then looked at the wikipedia page and I noticed that they are quite different from what I was expecting: I was expecting some kind of "shield", plate or ...