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Bernoulli and his Principal of Airflow. Within any confined system, total energy remains constant. If one component of energy increases, there must be a corresponding decrease in other components. Total pressure within the confined system is the summation of static and dynamic pressure.

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Bernoulli and his Principal of Airflow


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Presentation Transcript
slide1

Bernoulli and his Principal of Airflow

Within any confined system, total energy remains constant. If one component of energy increases, there must be a corresponding decrease in other components.

Total pressure within the confined system is the summation of static and dynamic pressure

slide2

Slow velocity of air with equal static and dynamic pressures

As air velocity increases, static pressure decreases, dynamic pressure increases

Venturi Tube

(subsonic, incompressible flow)

The volume of air passing any given point per unit of time is equal throughout the tube.

This is known as MASS FLOW RATE

slide3

Airfoil

Lets take half of that venturi tube and see what happens

when we move air across the shape

Lets assume there is no upper physical limit of the tube

The flow closest to the airfoil conforms to the shape of the

airfoil while the air farthest from the airfoil remains horizontal

and acts like the upper surface of the venturi

slide4

Static = 1

Dynamic = 8

= 9

Static = 5

Dynamic= 5

= 10

Static = 4

Dynamic = 6

= 10

Static = 4

Dynamic = 7

= 11

High seeks Low

How is most of the lift produced?

Since air has a greater distance to travel over the upper surface there is a greater velocity increase and pressure decrease over the upper surface than the lower surface. The higher pressure below the airfoil seeks the lower pressure above causing the airfoil to move up.

Low Pressure Area

High Pressure Area

slide5

Question

If the differential in pressures produces most of the lift, what is producing the rest of the lift?

The remaining lift is a result of Newton’s third law of motion,

Action

Reaction

and