Compressible Flow Subroutine Library
Programming Reference Manual
Version 1.0 DD-00008-010E

3.5.1 Introduction

This function group computes the thermodynamic properties of isentropic flow for a calorically perfect gas as described in [naca1135] with one-dimensional variable changes. Isentropic flow assumes the following continuity equation:

ρAV  =const

The momentum equation is:

      2
p+ρAV   =const

The following properties are computed:

Table 3: Isentropic flow properties



I Property Description



1 M Mach number
2 p0/p1   Pressure ratio
3 ρ0/ρ1   Density ratio
4 T0/T1   Temperature ratio
5 A/A* Critical area ratio