This explanation violates basic physics. There is no physical law requiring two adjacent air molecules to meet back up at the trailing edge. In reality, wind tunnel testing proves that the air traveling over the upper surface accelerates so significantly that it reaches the trailing edge long before the air traveling underneath. The Standard Venturi Explanation
Almost all aerodynamic failures and limits are due to viscous separation.
-bernoulli's eqn relates pressure-velocity-density -it decreases as velocity increases
: This pressure distribution dictates velocity. The low pressure above the wing accelerates the fluid, causing higher velocities. The high pressure below the wing decelerates the fluid. This satisfies Bernoulli's principle, which is a statement of the conservation of energy. understanding aerodynamics arguing from the real physics pdf
Without Circulation With Circulation (Real Lift) (Rear Stagnation Point) (Rear Stagnation Point) _____ _____ / \ / \ ===> -----| Wing |----- ===> ===> -----| Wing |-----\ \_______/ \_______/ \ | \====> Downwash (Air flows upward around edge) (Air leaves smoothly at sharp trailing edge) Viscosity and the Boundary Layer
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On a lifting wing, a localized low-pressure zone develops over the upper surface, while a higher static pressure zone forms underneath. This explanation violates basic physics
Fluids have a natural tendency to follow the contour of a curved surface, a phenomenon known as the . As a fluid flows over the curved upper surface of an airfoil, viscosity and friction cause the airflow to adhere to the surface, bending downward.
The downward pull of gravity on the aircraft's mass.
When a wing moves through a fluid, it establishes a global flow field. You cannot change the velocity at one point without instantly altering the pressure and velocity at every other point in the field. The high pressure below the wing decelerates the fluid
Drag is often broken down into two main types, but in reality, they are interconnected:
[ Upper Flow: Accelerated / Low Pressure ] _______--_ _..---'''' ''--_ ====> _..---'' ''--__ ====> Downwash ====> ''--__ ''---____ ____--'' ''''--------''''' [ Lower Flow: Decelerated / High Pressure ] Fluid Deflection and Newton’s Third Law
While the principles above are foundational, a complete understanding requires quantitative data, experimental results, and vector calculus. A dedicated technical document, such as a provides:
Before we dive into the real physics, we must purge the myths.