Thumbnail
Access Restriction
Open

Author Duff, R. E. ♦ Davidson, N.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ AIR ♦ DECOMPOSITION ♦ DIFFERENTIAL EQUATIONS ♦ HIGH TEMPERATURE ♦ INERT GASES ♦ MATHEMATICS ♦ MOLECULES ♦ NITROGEN ♦ NITROGEN OXIDES ♦ NUMERICALS ♦ OXYGEN ♦ PRESSURE ♦ SHOCK WAVES ♦ TEMPERATURE ♦ VELOCITY ♦ VIBRATIONS
Abstract A numerical integration procedure was used to investigate the reaction profile behind strong shock waves in air. The Mach number range from 8 to 15 was covered; the initial temperature was 300 deg K; and the initial pressures were 1 and 10 mm Hg. The dissociation reactions for O/sub 2/, N/sub 2/, and NO were considered along with the "shuffle" reactions N + O/sub 2/ in equilibrium NO + O and O + N/sub 2/ in equilibrium NO + N. No ionization reactions were included. Above M/sub s/ = 10, the calculations show a pronounced transient maximum in the NO concentration. In addition, the rates of change of concentrations at constant volume of all species except O/sub 2/ change sign under certain conditions. Several additional calculations were made which included an approximate treatment of the effects of a finite rate of vibrational excitation of O/sub 2/ and N/sub 2/ . These calculations suggest that even at M/sub s/ = 15, the vibrational excitation reactions have only a limited effect on the reaction profile. A calculation of the reaction profile for air at high pressure diluted with a large excess of inert gas at 3000 deg K showed that the Zeldovich mechanism approximately describes the production of NO under these conditions even though it fails completely for undiluted air at high temperatures. (auth)
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 1959-10-01
Publisher Department Los Alamos Scientific Lab., N. Mex. ♦ California Inst. of Tech., Pasadena
Journal Journal of Chemical Physics
Volume Number 31
Organization Los Alamos Scientific Lab., N. Mex. ♦ California Inst. of Tech., Pasadena


Open content in new tab

   Open content in new tab