03 Flashcards
1
Q
Stream tube, pathlines
A
Volume of air bounded by streamlines, trajectories of small volumes of air, show turbulence
2
Q
Laminar flow
A
Smooth predictable, speed and direction easily measured
3
Q
Vortex flow
A
3 D flow, requires a lot of energy, can comprise streamlined and turbulent how
4
Q
2D vs 3D flow
A
Describes behaviour around anaerofoil, 3D wing
5
Q
Ideal fluid
A
No viscosity, incompressible
6
Q
- Equation of continuity
A
Air mass flow.=v + + rho + cross sectional area.
7
Q
Bernoulli’s theorem
A
In the flow of an ideal fluid, the sum of the pressure and ke (per unit volume) remains constant
Static pressure +q = total pressure
8
Q
I s density constant in a low subsonic flow (300)kt
A
Yes
