Accession Number : AD0437302


Title :   IBM 7090 SUBROUTINES FOR REAL GAS PROPERTIES OF HIGH-TEMPERATURE AIR,


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Glowacki,W J ; Maher,E F


Report Date : 05 Dec 1963


Pagination or Media Count : 72


Abstract : Empirical equations for the entropy, enthalpy, and compressibility of high-temperature and air and a sound speed equation obtained by differentiating the entropy equation have been programmed as Fortran function subroutines for the IBM 7090 computer. Extensive tests have been performed to determine the accuracy of the subroutines for temperatures from 100 K to 15,000 K and for densities from 10 to the -6th power to 100 times the density at standard conditions. The calculated entropy, compressibility, and sound speed values agree with the tabulated data within 2 or 3% with few exceptions. The enthalpy values generall agree within 5%. The use of two subordinate subroutines decreases the error in the calculated entropy and enthalpy values to about 0.1% and 1% respectively. The equations and the corresponding Fortran function subroutines are presented together with the two correction subroutines, and the test results are tabulated in detail. (Author)


Descriptors :   *THERMODYNAMICS , *COMPRESSED AIR , COMPUTER PROGRAMMING , PHYSICAL PROPERTIES , ENTROPY , ENTHALPY , SOUND , EQUATIONS , PROGRAMMING LANGUAGES , ERRORS , TABLES(DATA)


Distribution Statement : APPROVED FOR PUBLIC RELEASE