AerodynamicsAirflow Characteristics
Boundary Layer
The boundary layer is the thin layer of air immediately adjacent to the surface of an aerofoil where airflow is slowed due to skin friction. It transitions from smooth, orderly laminar flow near the leading edge to more chaotic turbulent flow further aft.
Key Points
- •Skin friction slows the air directly next to the wing surface to zero relative velocity.
- •Comprises both laminar (smooth) and turbulent (mixing) boundary layer regions.
- •Separation of the boundary layer from the wing surface causes an aerodynamic stall.
Exam Relevance
Knowledge of the boundary layer is crucial for understanding skin friction drag and the fundamental aerodynamic mechanisms of a stall.
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