what is that? it explains why and airplane gets lift it explains why a curve ball curves it can...
TRANSCRIPT
BERNOULLI'S PRINCIPLE
What is that?
• It explains why and airplane gets lift
• It explains why a curve ball curves
• It can impress your friends
Theory of Flight
Aerodynamics• Bernoulli principle
“As the air velocity increases, the pressure decreases; and as the velocity decreases, the pressure increases.”
A major part of the knowledge base needed in the design and development of aircraft.
Contributed to the work of G.B. Venturi, an Italian scientist, who first noted the effects of constricted channels on the flow of fluids. A round tube, such as a nozzle or jet engine, designed to increase the speed of flowing gases and liquids is called a venturi.
Why a curve ball curves?
What do the laces do? What does faster/slower rotation do? Demonstrate?
Theory of Flight
• The four forces in balance with one another hold the plane in the air.
• The four forces are lift, weight, thrust, and drag.
Video Demonstration
Video Presentation / Bernoulli’s Principle
The Four Forces of Flight
• According to the Bernoulli Principle, there is an increase in the velocity of air as the airflow around an airfoil shape; therefore, there is an increase of the relative wind as it flows above and below the surface of the airplane wing.
The Four Forces of Flight
• Lift can be increased in two ways1. Increasing the forward speed of the airplane. (Increase Relative Wind)2. Increase the angle of attack.
• The pilot can increase the forward speed of the aircraft by applying more power (Thrust).
The Four Forces of Flight
• Angle of Attack The sum of all the tiny forces over the
surface of the wing is called the resultant.
The Four Forces of Flight
• Angle of Attack The angle at which lift stops
increasing and begins to decrease is called the burble point.
The Four Forces of Flight
• Airfoil Shape It is extremely important to
preserve the characteristic curve that the designers built into the airfoil.
Dents, mud, and ice are three common things that can spoil the built-in shape of the airfoil and interfere with the performance of the entire aircraft.
The Four Forces of Flight
• Wing Area and Lift The greater the surface area of the
wing, the greater the amount of lift that will be generated.
Gliders and sailplanes are very good examples of how a large wing surface generates lift.
Summary
As air velocity increases, pressure decreases
As velocity decreases, pressure increase Pressure increase creates lift Curveball is a ball adjusting to pressure Bernoulli principle major part of wing
design