Fundamentals Of Flight Test One

Front 1

mean free path

Back 1

distance molecules move between collisions

Front 2

temperature

Back 2

measure of average kinetic energy of molecules

Front 3

pressure

Back 3

net force imparted by the molecules on a surface per unit area

Front 4

continuum hypothesis

Back 4

dA is much smaller than flow motions and much larger than mean free path. Therefore the velocity, temperature, pressure, density, etc can be identified for a specific point in our flow field.

Front 5

assumptions for an ideal gas

Back 5

mean free path >> diameter of molecules
elastic collisions between molecules in gas

Front 6

two types of forces acting on any body

Back 6

body forces, surface forces

Front 7

what's a body force?

Back 7

a force that acts on the center of gravity of an object

Front 8

what's a surface force?

Back 8

a force that is in direct contact with object

Front 9

what are the two surface forces?

Back 9

normal force due to pressure and tangential force due to shear friction.

Front 10

what are the resultant forces normal and parallel to the free stream velocity?

Back 10

lift and drag respectively.

Front 11

path line?

Back 11

trajectory of a single element through a flow (taken with a long exposure image)

Front 12

streak line?

Back 12

release particles from a single point then take a snapshot in time

Front 13

time line?

Back 13

line normal to the flow released then periodic snapshots taken after release.

Front 14

stream line?

Back 14

a line where the velocity is tangent to any point on the line.

Front 15

what are hydrostatics?

Back 15

study of stationary fluid

Front 16

h sub A

Back 16

absolute altitude (measured from the center of earth)

Front 17

h sub G

Back 17

measured from sea level

Front 18

h

Back 18

geopotential altitude

Front 19

continuity equations in words

Back 19

rate of change of mass in system is equal to the net mass flow rate through the control surface

Front 20

uniform flow

Back 20

velocity is constant across inlet or outlet

Front 21

flow is incompressible if?

Back 21

M < .3

Front 22

Assumptions for momentum equation P + 1/2*(ro)*V^2 = Po

Back 22

steady flow, inviscid, no gravity, along a streamline, incompressible

Front 23

inviscid

Back 23

frictional forces are negligible

Front 24

Isentropic flow assumptions

Back 24

fully reversable process (no loss of energy)
adiabatic

Front 25

adiabatic

Back 25

no heat added or subtracted, delta q = 0