
Accession Number : AD0687465
Title : ASYMPTOTIC SOLUTIONS OF NORMAL SHOCK WAVES STRUCTURED BY NONEQUILIBRIUM RADIATIVE AND COLLISIONAL IONIZATION,
Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
Personal Author(s) : Clarke,Joseph H. ; Onorato,Michele
Report Date : MAR 1969
Pagination or Media Count : 87
Abstract : Normal shock waves structured by nonequilibrium radiative and collisional ionization are solved analytically. On the basis of current literature, an earlier radiation model for monatomic gases is generalized to include the second continuum with the first continuum and the lines; in the model, the onestep radiative ionization process of interest is interior to a much thicker region only weakly structured by the twostep radiative ionization process. Just downstream of the interior embedded discontinuity, it is assumed that electronatom collisional ionization to local thermodynamic equilibrium occurs over a length that is small compared with the relevant onestep photon path. It is discovered that the appropriate emmissionconvection ratio is also a rather small quantity. Both small quantities lead to iterations studied to second approximation. The resulting shock morphology consists of a strong precursor, the embedded discontinuity, an inner collisional tail, and an outer radiative tail. The interaction of the two small parameters requires certain final reinterpretations. Calculations for helium and argon are presented for a downstream degree of ionization of 0.8, an upstream temperature of 300K, and upstream pressures of .001, .0001, and .00001 atmospheres. (Author)
Descriptors : (*SHOCK WAVES, NUMERICAL ANALYSIS), NONEQUILIBRIUM FLOW, GAS IONIZATION, THERMODYNAMICS, PHOTONS, APPROXIMATION(MATHEMATICS), INTERACTIONS, HELIUM, ARGON
Subject Categories : Aerodynamics
Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE