Question

Explain and discuss what stall is and what causes an airfoil to stall. Why are commercial aircraft not allowed to fly at conditions near stall?

Answer 1

The lift coefficient of an aircraft will increase with increase in angle of attack, but this increase is only up to a particular angle of attack, which is approximately beyond that the lift coefficient will decrease drastically. This decrease in lift with increase in angle of attack beyond is called stall. The stall occurs when airflow separates from the upper wing surface this happens when the plane under too higher angle of attack.

Decrease in lift of an aircraft is a serious problem with the safety of the aircraft if an aircraft losses lift it will fall down, so commercial aircrafts are not allowed to fly at a condition near stall. Stall also increases drag. It is caused due to flow separation, and due to flow separation a wide wake is formed on the top surface of the airfoil and causes stall.

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