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Development of Aerodynamic Forces. Overview. Streamline Patterns Review Pressure Patterns Understanding how lift is Generated. Streamline Review. Streamline Definition. A streamline is a path traced out by a mass less particle moving with the air flow.
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Overview • Streamline Patterns Review • Pressure Patterns • Understanding how lift is Generated
Streamline Definition • A 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 Patterns • Streamline patterns and pressure distributions on a non-rotating cylinder and symmetric airfoil at zero angle of attack.
Lift Generation • Cylinder with circulation and lift
Lift on a wing • Lift results from two mass actions on a wing. • PRESSURE • Airflow Deflection = a force (3rd Law of Newton)