M8.2 Aerodynamics Flashcards
Can a flying body attain speeds to compress air in subsonic region?
No
Air is incompressible
The continuity equation states that speed of airflow is inversely proportional to what?
To the area of the cross section of the tube if density remains constsnt
A (diffuser) outlet is used when diameter does what and speed does what?
Diameter increases
Speed decreases
A (jet) outlet is used when diameter does what and speed does what?
Diameter decreases
Speed increases
At the point of stagnation speed is what and static pressure equals what?
Speed is zero
Static pressure equals total pressure
What is laminar flow?
When particles in the fluid all flow parallel to one another with no turbulence
What part of the wing is a safer part to have stall?
Root
What is the angle called between effective airflow and relative airflow known as?
Induced alpha
(Angle of attack)
Wash in states that angle of incidence is greater towards what?
Wing tips
Wash out states angle of incidence is greater towards what?
The root
What is downwash?
After passing over aerofoil the fluid flow returns to original state
During upwash where does the air turn?
Towards the low pressure region on the upper surface of aerofoil
What is a chord line?
Imaginary line connecting leading edge and trailing edge
Describe geometrically twisted wing?
Camber of the profile is constant
But angle of incidence is greater at root than tip
Describe aerodynamically twisted wing?
Camber of profile at root is greater than the camber at the tip
Angle of incidence is constant across wingspan
Chord lines parralel
