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ESDU 74028

1993 Edition, March 1, 2007

Complete Document

One-dimensional compressible gas flow in ducts.

Includes all amendments and changes through Addendum , March 1, 2007


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Product Details:

  • Revision: 1993 Edition, March 1, 2007
  • Published Date: March 1, 2007
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Engineering Sciences Data Unit (ESDU)
  • Page Count: 28
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

ESDU 74028 gives curves and equations for use in the calculation of isentropic flow of a perfect gas; they are applicable to numerous practical situations. The curves are plotted for a range of ratios of specific heat capacities from 1 to 1.67 and for Mach numbers to unity. The equations can be applied to all Mach numbers provided no dissociation occurs. The conditions covered are 1. at a point in the flow, the ratio of static/total temperature, of static/total pressure, and of velocity/speed of sound in the gas brought isentropically to rest; 2. at a point in the flow, the ratios of kinetic/total pressure and of dynamic/kinetic pressure; 3. for the expansion of a gas through a nozzle with sonic flow at the throat, the ratio as a function of Mach number of the pressure, temperature and area at any point in the flow to the pressure, temperature and area respectively at the throat; 4. in the expansion from a reservoir, the ratio of density, temperature and velocity to the corresponding reservoir conditions as a function of pressure ratio and 5. three mass flow functions involving total pressure and temperature, total temperature but static pressure, and static pressure and temperature.