Accession Number : AD0256239

Title :   CALCULATIONS OF THE ONE-DIMENSIONAL NONEQUILIBRIUM FLOW OF AIR THROUGH A HYPERSONIC NOZZLE

Corporate Author : STANFORD UNIV CALIF

Personal Author(s) : VINCENTI,WALTER G.

Report Date : MAY 1961

Pagination or Media Count : 1

Abstract : A method is described for numerical calculation of the one-dimensional nonequilibrium flow of a nitrogen-oxygen mixture through a converging-diverging nozzle. First, the general equations are set down for a mixture of perfect gases with an arbitrary number of species undergoing an arbitrary number of chemical and vibrational rate processes. The method of calculation is then described, including a perturbation process used to obtain the required initial conditions for the nonequilibrium computations. Specific calculations, carried out on an IBM 709 computer, are then reported for an air model consisting of O2, O, N2, N and NO and including eight chemical reactions plus the vibrational processes of three diatomic species. The results, which are for flow through a specific wind-tunnel nozzle at reservoir conditions of 7,950 K and 35 atmospheres density, demonstrate the feasibility of the method. They are limited in extent, however, by the excessive computing time entailed by the extremely small step size required to keep the integration process from diverging. (Author)

Descriptors :   *GAS FLOW, *HYPERSONIC FLOW, *HYPERSONIC NOZZLES, CHEMICAL REACTIONS, DIFFERENTIAL EQUATIONS, DIGITAL COMPUTERS, EQUATIONS, HYPERSONIC CHARACTERISTICS, MATHEMATICAL ANALYSIS, MIXTURES, NITROGEN, OXYGEN, SUPERSONIC WIND TUNNELS, WIND TUNNEL NOZZLES

Distribution Statement : APPROVED FOR PUBLIC RELEASE