Accession Number : AD0703214

Title :   A TIME-DEPENDENT QUASI-ONE-DIMENSIONAL ANALYSIS OF POPULATION INVERSIONS IN AN EXPANDING GAS.

Descriptive Note : Final rept.,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Anderson,John D. , Jr

Report Date : 12 DEC 1969

Pagination or Media Count : 39

Abstract : A time-dependent technique for the numerical solution of convergent-divergent, nonequilibrium nozzle flows was used to analyze the rapid, vibrational nonequlibrium, supersonic expansion of CO2-N2-H2O and CO2-N2-He mixtures, wherein the finite rate molecular energy transfer processes can result in a population inversion between the (001) and (100) vibrational energy levels of CO2. Results for such population inversions are presented. Among these, a comparison was made between the present results and the recent results of Basov et al; this comparison indicates that Basov's calculations overestimate the population inversion in an expanding mixture of CO2 and N2. In addition, results are presented from a series of numerical experiments conducted to assess the validity of several simplified methods for computing population inversions. (Author)

Descriptors :   (*NOZZLE GAS FLOW, ONE DIMENSIONAL FLOW), CONVERGENT DIVERGENT NOZZLES, CARBON DIOXIDE, NITROGEN, HELIUM, MIXTURES, POPULATION(MATHEMATICS), NONEQUILIBRIUM FLOW, SCATTERING, SUPERSONIC FLOW

Subject Categories : Aerodynamics
      Statistics and Probability
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE