Development of Aerodynamic Forces

OverviewStreamline Patterns Review

Pressure Patterns

Understanding how lift is Generated

Streamline Review

Streamline DefinitionA streamline is a path traced out by a mass less

particle moving with the air flow.

Velocity is tangent to the streamline at every point. Mass does not cross streamlines.

Streamlines moving closer together indicate increased speed and decreased static pressure and vice versa.

Pressure PatternsStreamline patterns

and pressure distributions on a non-rotating cylinder and symmetric airfoil at zero angle of attack.

Lift GenerationCylinder with

circulation and lift

Lift Generation

Lift on a wingLift results from two mass actions on a wing.

PRESSURE

Airflow Deflection = a force (3rd Law of Newton)

Understanding the Coanda Effect