|Author||Duff, R. E. ♦ Davidson, N.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|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)|
|Learning Resource Type||Article|
|Publisher Department||Los Alamos Scientific Lab., N. Mex. ♦ California Inst. of Tech., Pasadena|
|Journal||Journal of Chemical Physics|
|Organization||Los Alamos Scientific Lab., N. Mex. ♦ California Inst. of Tech., Pasadena|
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