Accession Number : AD0455149

Title :   PRELIMINARY ESTIMATES OF THE TEST-SECTION CHARACTERISTICS IN A HIGH-ENTHALPY, LOW-DENSITY WIND TUNNEL,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON DC

Personal Author(s) : Krouse, John R.

Report Date : SEP 1964

Pagination or Media Count : 29

Abstract : Preliminary estimates are obtained of the testsection characteristics in a high-enthalpy, lowdensity wind tunnel. The initial stagnation conditions are assumed to be a temperature of 900 R and atmospheric pressure; the steady, onedimensional, inviscid, adiabatic expansion is terminated at 0.00001 atmosphere. Air is used as the working medium. The computations are performed for both equilibrium and frozen flow processes, thus enabling a physical appreciation for the comparative behavior of the two extremes which serve as upper and lower limits on any nonequilibrium behavior. The variables that are evaluated include the significant physical, thermodynamic, and transport properties, in addition to some of the more important dimensionless aerodynamic similarity parameters, all of which are presented graphically as a function of nozzle static pressure. It is demonstrated that the test-section characteristics depend to a considerable degree on the governing flow process. (Author)

Descriptors :   (*HYPERSONIC WIND TUNNELS, AERODYNAMIC CHARACTERISTICS), HYPERSONIC CHARACTERISTICS, WIND TUNNEL NOZZLES, NOZZLE GAS FLOW, AIR, PLASMA JETS, HYPERSONIC NOZZLES, HIGHTEMPERATURE RESEARCH, TEST FACILITIES, OPTIMIZING, DENSITY, ENTHALPY, FROZEN EQUILIBRIUM FLOW, PHYSICAL PROPERTIES, THERMODYNAMICS, THERMAL PROPERTIES, TRANSPORT PROPERTIES, SPECIFIC HEAT, VISCOSITY, FLUID FLOW, FLUID MECHANICS, ADIABATIC GAS FLOW, REYNOLDS NUMBER, MATHEMATICAL PREDICTION, TEMPERATURE, GAS IONIZATION, DISSOCIATION, DIGITAL COMPUTERS, ANALYSIS, GRAPHICS, RAREFIED GAS DYNAMICS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE