bernoulli's principle

explain bernoulli's principle by using animation

Category:

Science & Technology

Tags:

• bernoulli's
• principle
• animation

[MrRonnieG]

Air, going over the top of a convex wing, is not travelling faster but, instead, slower. It slows even more when required to travel (flow) over an extended surface such as flats & slats. The slower the speed the more negative air pressure, the more lift which is created from events on the top, rather than the bottom, of the wing. Right?

[mobius1aic]

@mobius1aic It is however completely correct that the "equal transit time" is a misguided answer as to why air going over the top of the wing is moving faster. From what I understand, it's more or less the compression and deflection of air as it hits the curve/edge that forces it to increase it's velocity as the wing slices through it, in a diffusive manner.

[mobius1aic]

@mobius1aic Aircraft moving relatively fast enough to have the wing at 0°/low α in level flight will be flying on lift developed via the Bernoulli principle, not deflection.

[mobius1aic]

@mobius1aic An upside down wing requires a very significant α in order to influence the fluid to travel faster along it's "top". Aerobatics aircraft tend to have the teardrop airfoil shape since it's a relatively symmetrical airfoil that can allow for the plane to fly upside down without much trouble. Normal level flight requires the wing to have a small +α, so it's installation on the aircraft tends to be within the 10° region judging by it's chord.

[mobius1aic]

@dmartinez95 While this is true, the Bernoulli principle is still in effect when a wing is completely level, and there is no downward deflection.

I think there are way too many fans of specific "camps" in aerodynamics and wing lift theory. In the end it's the combination of much lower pressure on top than on the bottom of the wing. Deflection, Bernoulli effect, and the Coanda effect are all in play here at the same time.

[coolruehle]

The region of high pressure is between your lips and the microphone. Move it away from your mouth next time.

[TEHGROUND]

The airfoil statement is wrong, but good job though!

[dmartinez95]

I recommend "A Physical Description of Flight; Revisited" if you're interested.

[dmartinez95]

Bernoulli's equation applies to flows with no work. You're airfoil explanation relies on the theory of equal transit times which is wrong...The shape of the wing influences stall characteristics. A flat plate or even the wing you showed if turned upside down will fly. It's about diverting air down and Newton's laws not Bernoulli. I recommend reading this if you're really interested.

[g1geo1g]

Obviously you don't row boats very much. Enjoyed the hair dryer thing but the wing is oversimplified. The leading edge is active and leads to the air traversing the top section significantly faster than that below. I wonder how much of the physics you understand.