Page 156 - 48Fundamentals of Compressible Fluid Mechanics

118 CHAPTER 7. NOZZLE FLOW WITH EXTERNAL FORCES

is zero, e.g. horizontal flow, the equa-
tion (7.11) reduced into that was developed previously.

The ability to manipulate the location provides a mean to in-
It should be noticed that when

crease/decrease the flow rate. Yet this ability since Ozer number is relatively very

look for experimental picture small.

demonstrating this point by
changing the direction of the
flow from experimental to ver- Meta
tical
o work out the example:
Calculate the location of the flow rate when the gravity is taken into account.
The nozzle dimensions are shown in the attached figure.
Meta End
This condition means that the critical point can occurs in several locations
that satisfies equation (7.11). Further, the critical point, sonic point is
If
is a positive function, the critical point happen at converging part of the nozzle
is a negative function the critical point is diverging

a flow in a nozzle

vertically the critical point will be above the throat.
(before the throat) and if
part of the throat. For example consider the gravity,
7.2 Isothermal Nozzle