How wings generate lift ? | part 2 (2019)

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✈✈✈ How do wings generate lift? Lift is not as easy as we think, and has caused a lot of controversy and misunderstanding. Our last video explains the lift generation based on Bernoulli’s principle and Newton’s 3rd law, and the common misconception of Equal Transit-time theory.

Lift is a result of both the downward deflection of the air flow and pressure imbalance consistent with Bernoulli's principle. The simplified physical explanations based on Newton’s law or Bernoulli Principle are not contradictory, but each explains only part of the phenomenon and leaves the other part unexplained.

So what’s the underlying mechanism of lift? How is lift related to pressure imbalance?

The pressure imbalances arise in conjunction with the curved airflow. When a flow is curved, there is a pressure gradient perpendicular to the flow direction with higher pressure on the outside of the curve and lower pressure on the inside, which is the Coanda effect. We will explain in this video how the curved flow causes the pressure differences and generate lift based on Coanda effect.

In aerodynamics, you may also hear the terminology Angle of attack. Angle of attack: is critical to lift. What is the angle of attack? Why a plane will stall? Why planes with flat plates or symmetrical airfoils can also fly? How a plane could fly upside down? Hope this video helps you answer these questions.

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Attribution and acknowledgement

Plane Image by OpenClipart-Vectors from Pixabay
Video by Pixabay from Pexels
Paper airplane video by Miguel Á. Padriñán from Pexels
Music by Rafael Krux from freepd.com

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