Assessment of a two-temperature kinetic model for dissociating and weakly ionizing nitrogen

The validity of the author's two-temperature, chemical/kinetic model which the author has recently improved is assessed by comparing the calculated results with the existing experimental data for nitrogen in the dissociating and weakly ionizing regime produced behind a normal shock wave. The computer program Shock Tube Radiation Program (STRAP) based on the two-temperature model is used in calculating the flow properties behind the shock wave and the Nonequilibrium Air Radiation (NEQAIR) program, in determining the radiative characteristics of the flow. Both programs were developed earlier. Comparison is made between the calculated and the existing shock tube data on (1) spectra in the equilibrium region, (2) rotational temperature of the N2(+) B state, (3) vibrational temperature of the N2(+) B state, (4) electronic excitation temperature of the N2 B state, (5) the shape of time-variation of radiation intensities, (6) the times to reach the peak in radiation intensity and equilibrium, and (7) the ratio of nonequilibrium to equilibrium radiative heat fluxes. Good agreement is seen between the experimental data and the present calculation except for the vibrational temperature. A possible reason for the discrepancy is given.

[1]  Chul Park,et al.  Assessment of two-temperature kinetic model for ionizing air , 1987 .

[2]  V. McKoy,et al.  Electron-nitrogen molecular collisions in high-temperature nonequilibrium air , 1986 .

[3]  J. Lee.  Electron-impact vibrational excitation rates in the flow field of aeroassisted orbital transfer vehicles , 1985 .

[4]  C. Park,et al.  Radiation Enhancement by Nonequilibrium in Earth's Atmosphere , 1985 .

[5]  G. Walberg.  A Survey of Aeroassisted Orbit Transfer , 1985 .

[6]  Jong-Hun Lee,et al.  Basic governing equations for the flight regimes of aeroassisted orbital transfer vehicles , 1984 .

[7]  Chul Park,et al.  Problems of Rate Chemistry in the Flight Regimes of Aeroassisted Orbital Transfer Vehicles , 1984 .

[8]  D. M. Cooper.  Spectral intensity measurements from high-pressure nitrogen plasmas. , 1972 .

[9]  J. P. Appleton,et al.  Excitation Mechanisms of the Nitrogen Frist‐Positive and First‐Negative Radiation at High Temperature , 1972 .

[10]  Chul-ya Park.  Measurement of ionic recombination rate of nitrogen. , 1968 .

[11]  J. P. Appleton,et al.  Erratum: Shock‐Tube Study of Nitrogen Dissociation Using Vacuum‐Ultraviolet Light Absorption , 1968 .

[12]  J. P. Appleton.  Shock‐Tube Study of the Vibrational Relaxation of Nitrogen Using Vacuum‐Ultraviolet Light Absorption , 1967 .

[13]  R. A. Allen,et al.  Air radiation tables - Spectral distribution functions for molecular band systems , 1966 .

[14]  S. Byron.  Shock‐Tube Measurement of the Rate of Dissociation of Nitrogen , 1966 .

[15]  James C. Keck,et al.  DIFFUSION THEORY OF NONEQUILIBRIUM DISSOCIATION AND RECOMBINATION , 1965 .

[16]  R. Allen.  Nonequilibrium Shock Front Rotational, Vibrational and Electronic Temperature Measurements , 1965 .

[17]  Roger C. Millikan,et al.  Systematics of Vibrational Relaxation , 1963 .

[18]  P. V. Marrone,et al.  Effect of Dissociation on the Rate of Vibrational Relaxation , 1962 .

[19]  J. C. Camm,et al.  Radiation from hot nitrogen , 1961 .

[20]  C. Park.  A review of shock waves around aeroassisted orbital transfer vehicles , 1986 .

[21]  C. Park,et al.  On convergence of computation of chemically reacting flows , 1985 .

[22]  C. Park,et al.  Nonequilibrium Air Radiation (NEQAIR) Program , 1985 .

[23]  C. Park.  Calculation of Nonequilibrium Radiation in the Flight Regimes of Aeroassisted Orbital Transfer Vehicles , 1984 .

[24]  D. D. Drysdale,et al.  Evaluated kinetic data for high temperature reactions , 1972 .

[25]  E. Becker.  Chemically Reacting Flows , 1972 .

[26]  J. Lordi,et al.  Measurement of N2/plus/ plus e/-/ dissociative recombination in expanding nitrogen flows , 1970 .

[27]  W. Lotz,et al.  Electron-impact ionization cross-sections and ionization rate coefficients for atoms and ions from hydrogen to calcium , 1968 .

[28]  N. H. Pratt,et al.  Conditions for significant gasdynamically induced vibration-recombination coupling , 1967 .

[29]  R. Rehm,et al.  Population distributions during vibrational relaxation of diatomic gases , 1967 .

[30]  B. Cary.  Shock-Tube Study of the Termal Dissociation of Nitrogen , 1965 .