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How airfoil increases its speed?(a) Flow over the topside(b) Flow over the leading edge(c) Flow over the bottom side(d) Flow over the trailing edgeI have been asked this question in class test.My doubt stems from The Kutta Condition topic in chapter Incompressible Flow over Airfoils of Aerodynamics

Answer»

Right answer is (a) Flow over the topside

Easiest explanation: As the vorticity INCREASES the BOUND vortex and also PROGRESSIVELY increases and causes the flow over the topside of the airfoil to increase in speed. The starting vortex is SOON cast-off the airfoil and is left behind, SPINNING in the air, where the airfoil left it.



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