8.2 Flashcards
Unit for KInetic energy
KE = 0.5 *p * V^2
Unit is joules
What is the principle of continuity
Energy or mass can’t be created or destroyed it can only be changed from 1 form to anoth3r
What is laminar flow
When there is a smooth regular airflow pattern around an object
What is turbulent flow
This happens when air is disturbed and separates from the surface of a moving body
State the continuity equation what is the mathematical expression
States that the speed of the airflow is inversely proportional to the area of the cross section of the tube if the density remains constant
p1=p2 (density)
Therefore
V1 * A1 = V2 * A2
What is boundary layer
Is the layer of fluids in the immediate area of a surface
What is known as the no slip conditions
This is when the surface brought to rest by friction
As an aircraft moves through the air it affects the air around it. What are the causes for this
Change in direction, Heat up, changing velocity and pressure
As an aircraft moves through the air it affects the air around it. What are the causes for this
Change in direction, Heat up, changing velocity and pressure
Advantages of laminar flow
Laminar flow has less surface friction giving rise to low fuel usage, giving greater range.
Ability to glide further in the event of engine failure.
Disadvantages of laminar flow
Low kinetic energy this means easier for flow separation to occur. Easier to stall at lower angles of attack.
What is a vortices
Circular pattern of rotating air is formed behind a wing or control surface as it generates life or force from the pressure differential
What is stall
Reduction in lift when AOA is reached
What are the 2 type of stall
Wing root stall
Wing tip stall
What is a stall strip
It’s used on smaller aircraft to prevent wings tip from stalling first
It’s mounted at the leading edge of the wing root and the disadvantage is it disturbs the lift
