• Version
• 76 Downloads
• 5.03 MB File Size
• 1 File Count
• December 12, 2016 Create Date
• December 12, 2016 Last Updated

National Advisory Committee for Aeronautics, Technical Notes - Tables of Thermodynamic Functions for Analysis of Aircraft Propulsion Systems

Tables of thermodynamic functions are presented for 42 sub-.
stances containing the following elements: argon, aluminum, boron,
carbon, chlorine, fluorine, hydrogen, lithium, nitrogen, and oxygen.

The functions tabulated are specific heat at constant pressure 0;,
sensible enthalpy Bag-38, smn of sensible enthalpy and chemical

energy 33, molar entropy SE,‘ 'enthalpy change due to formation
of substance from elements in atomic gas state divided by gas con-
stant times temperature -AH°/BT, and the logarithm of the equilib-
rimn constant 10310 K at temperatures of 298.16° K and every 100°
from 500° to 6000° K.

A high degree of self-consistency among the thermodynamic func-
tions was maintained in the temperature range from 1000° to 6000° K
by computing from specific-heat data the values of the other func-
tions and retaining, in general, more decimal places than are sig-
nificant. Interpolation formulas are given that permit determination
of self-consistent values for all the functions at any temperature
between 1000° and 6000° K. These tables were prepared for use in
computing the theoretical performance of aircraft propulsion systems.

Tables of thermodynamic functions for products of combustion
are useful in computing the theoretical performance of aircraft pro-
pulsion systems, particularly ram-Jet and rocket engines. Tables
containing the functions specific heat at constant pressure GP,
sensible enthalpy Eg- 113, and molar entropy Sf]? exist for most of
the substances of concern herein for at least part of the desired
temperature range. Several special functions are required for con-
venient use with the method of determining equilibrium composition
and temperature described in reference 1; tables were therefore
prepared at the NACA Lewis laboratory from January to June 1949 that
contain, in addition to C3, Eg-HB, and 5.5%, assigned values of
enthalpy E? and values of loglo K and 5%!— (logarithm of equilib-
rium constant and enthalpy change divided by gas constant times tem-
perature, respectively, for reaction of formation of a substance from
its elements in atomic gas state).