Page 81 - 48Fundamentals of Compressible Fluid Mechanics

4.2. ISENTROPIC CONVERGING-DIVERGING FLOW IN CROSS SECTION 43

(4.18)

The pressure difference normalized by the velocity (kinetic energy) as correction

factor is % %

(4.19)

From above equation, it can be observed that the correction factor approaches

"

and then the equation (4.19) approaches to the standard

equation for incompressible flow.
zero when
The definition of the star Mach is ratio of the velocity and star speed of

).
sound (the speed of sound at
(4.20)

,

(4.21)

(4.22)

The normalized mass rate becomes

(4.23)

The ratio of the area to star area is

(4.24)

4.2 Isentropic Converging-Diverging Flow in Cross Sec-

tion