Effect of wing tip vortex reversal

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Discussion Overview

The discussion revolves around the hypothetical scenario of reversing the direction of wing tip vortices in aircraft wings and its potential effects on thrust and lift. Participants explore the implications of such a reversal, considering both theoretical and practical aspects of aerodynamics and wing design.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the possibility of reversing wing tip vortices and asks about the potential increase in thrust or lift from such a change.
  • Another participant suggests that while wing tip vortices can be suppressed through airfoil design, the effects on lift are complex and cannot be easily determined.
  • A participant argues that wing tip vortices are inherently linked to the flow over the wing, implying that reversing them would require fundamental changes to that flow.
  • There is a discussion about winglets and their role in managing wing tip vortices, with clarification that they do not reverse the vortices but rather relocate them to minimize their impact on lift.
  • One participant proposes that if the wing design could generate a downward force near the tip, it might lead to opposite rotating vortices, but acknowledges that this would still incur drag and energy costs.
  • Another participant emphasizes that effective wing design should focus on high aspect ratio wings, well-designed winglets, and proper load distribution rather than attempting to reverse vortex direction.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and implications of reversing wing tip vortices, with no consensus reached on the potential benefits or practicality of such an approach.

Contextual Notes

The discussion highlights the complexity of aerodynamic interactions and the limitations of hypothetical scenarios that do not account for the fundamental principles of fluid dynamics.

fayaazhussain
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If there was any possibility of reversing the direction of wing tip vortices, what would the effects be? Is there any chance of increasing the thrust or lift?
For example the right wing tip produces clockwise vortices and the left wing tip produces counter clockwise vortices(Aircraft viewed from back). What will happen if we somehow reverse the directions? i.e making right wing tip produce counter clockwise vortices and left wing tip produce clockwise vortices?
 
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possibility of reversing the direction of wing tip vortices
You can try to suppress them through proper airfoil design.

The affect you be less or null vibratory forces onto the airfoil or wing.
 
The affect onto the lift is a much more complicated problem. We can't simply say it will or won't increase lift if you suppress the shedding.
 
The problem with this thought experiment is that the wingtip vortices are a product of the flow over the wing. You can't change them without fundamentally changing the flow over the wing, so this hypothetical situation doesn't really make sense.
 
But wingtips are being used to eliminate them without changing the flow right?
 
Wingtips? You mean winglets? Not exactly. Winglets and raked wingtips essentially take the wingtip vortices and move them to a new location that has less effect on the lift-generating portions of the wings.
 
If designed the wing so that area near the tip was generating a downward force then the tip vortices would rotate in the opposite direction. But that is obviously not a good thing. The problem is that regardless of the direction they are rotating in they still result in drag. This is because energy is still spent making the air rotate. If you were to try some kind of flow control such as suction or blowing near the tip then it might be possible but it would probably require too much energy so it wouldn't be worth it. You are better off with a high aspect ration wing, well designed winglets and a good load distribution.
 

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