What explains the high pressure on the lower surface of an airfoil?
Fluid particles flowing along the top of the wing surface experience a change in pressure, moving from the ambient pressure in front of the wing, to a lower pressure over the surface of the wing, then back up to the ambient pressure behind the wing.
Why is the flow faster over the upper surface of an airfoil?
The shape of an airfoil causes air to flow faster on top than on bottom. The fast flowing air decreases the surrounding air pressure. Because the air pressure is greater below the airfoil than above, a resulting lift force is created.
Why is there lower pressure on top of an airfoil and?
The cambered shape of an aerofoil, such as a wing, adds to this effect by creating a flow pattern which creates a pressure gradient that is lower at the surface which then accelerates the air over the top of the wing rearwards and downwards bringing a significant amount of air from far above the wing also downwards.
Why does the pressure drop on the top of the wing?
The faster airflow over the top of the wing is indeed causing a pressure drop on this location but this is by far not comparable in magnitude to the pressure lowering caused by the flow turning as discribed above. Therefore, the faster airflow over the top of the wing is not the cause of the lift generation but the flow turning is the real cause.
How does fast moving air create low pressure area?
The higher pressure region pushes fluid (or any objects immersed in the fluid) toward the lower pressure region. THAT IS WHY it is going faster when it gets to the lower pressure region. The higher speed (as is commonly thought) is not creating the lower pressure, the pressure difference is accelerating the fluid.
Where does the force on an airfoil come from?
This force comes from a pressure gradient above the wing surface. Starting at the surface of the wing and moving up and away from the surface, the pressure increases with increasing distance until the pressure reaches the ambient pressure.