Assuming no flow separation, which of these statements about the flow around an aerofoil as the angle of attack increases are correct or incorrect?
I. The stagnation point moves down.
II. The point of lowest static pressure moves aft.
In aerodynamics, the stagnation point is the point in a flow field where the local velocity of the fluid (in our case the atmosphere) is zero.
This point is located on the leading edge of the wing.
Air above the stagnation point will move upwards and air below it will move downwards if looked at from the side.
If we increase the angle of attack, the stagnation point will move down, causing more air to move upwards over the upper side of the wing.
At a certain angle of attack, this air will move the stall warning upwards, letting off an audible warning horn in the cockpit.
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