POF Q2 - Airflow Flashcards
In PoF we make the assumption that air behaves like an ideal fluid.
What properties can we say an ideal fluid possesses?
a.Highly viscous and incompressible
b.Highly viscous fluid which is compressible
c.Incompressible with no viscosity
d.Compressible fluid with no viscosity
c.Incompressible with no viscosity
Increased airflow velocity on the wings upper surface causes a ……. in static pressure and a ……. in dynamic pressure.
a.Decrease, Increase.
b.Increase, Increase.
c.Increase, Decrease.
d.Increase, Drop.
a.Decrease, Increase.
Consider a stream tube. With an increase in distance between streamlines the (1) velocity and (2) mass flow will respectively..
a.(1) increase, (2) decrease.
b.(1) decrease, (2) decrease.
c.(1) decrease, (2) remain constant.
d.(1) increase, (2) remain constant
c.(1) decrease, (2) remain constant.
What happens to the (a) Static Pressure and (b) Total pressure in the diverging section of a venturi?
a.(a) decreases (b) increases
b.(a) increases (b) remains constant
c.(a) decreases (b) remains constant
d.(a) increases (b) decreases
b.(a) increases (b) remains constant
What best describes laminar flow?
a.A flow which rotates about itself in a helical motion
b.An unsteady flow with jumbled pathlines
c.A flow where air molecules take the path of most resistance
d.Smooth and Predictable flow where speed and direction are easily measured.
d.Smooth and Predictable flow where speed and direction are easily measured.
Consider air passing through a venturi.
What happens to static pressure (Ps) and dynamic pressure (q) in the venturi throat?
a.Static Pressure (Ps) : increases
Dynamic Pressure (q) : increases
b.Static Pressure (Ps) : decreases
Dynamic Pressure (q): increases
c.Static Pressure (Ps) : increases
Dynamic Pressure (q) : decreases
d.Static Pressure (Ps): decreases
Dynamic Pressure (q): decreases
b.Static Pressure (Ps) : decreases
Dynamic Pressure (q): increases
Label the venturi correctly.
coverging section (left)
diverging section (right)
throat (middle)
