11/1

Reading verification:

1.

What is the relationship between cross sectional area and velocity changes?

dA/A = (M²-1)du/u

2.

What argument allows you to substitute a Mach number for velocity above?

That the critical Mach number M* is proportional to u.

3.

Sketch area versus Mach number for isentropic flow in any duct.

See Figure 5.13 in the book

4.

What part of table A1 is specifically for converging-diverging ducts?

A/A*

5.

Describe the 4 major flow fields inside a converging-diverging duct with subsonic inflow.

(a)

all subsonic

(b)

choked but subsonic everywhere else

(c)

choked with a shock in the diverging part

(d)

choked, all supersonic in the diverging part

6.

Sketch pressure versus axial coordinate for the above four flow fields.

See Figure 5.15 for the first two, 5.17 for the third, 5.18 (without the final shock,) for the last.

7.

Sketch mass flow through a converging/diverging duct versus exit pressure.

See Figure 5.16.