Accession Number:

AD0610820

Title:

NONEQUILIBRIUM EXPANSIONS OF HIGH-ENTHALPY AIRFLOWS.

Descriptive Note:

Interim technical rept.,

Corporate Author:

CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s):

• LORDI,J. A.
• Mates,R. E.

Report Date:

1964-11-01

Pagination or Media Count:

64.0

Abstract:

Numerical solutions for nonequilibrium expansions of air from high stagnation temperatures and pressures were obtained. The results of these calculations are pertinent to the description of nonequilibrium effects on flows aimed at simulation of orbital velocity and higher. The thermodynamic chemical-kinetic model for air assumed in the calculations includes the six species established to be the dominant ones. These species are subject to vibrational and electronic excitation and coupled, chemical reactions. At the high densities considered here molecular interactions exert a significant influence on the equation of state. An excluded-volume correction which agrees with more detailed analyses was developed to account for these effects in the air-model. The results obtained for nonequilibrium effects in high-enthalpy expanding airflows show them to have significant influence on the thermodynamic properties and composition of the flow. Methods of correlating these nonequilibrium effects for various reservoir conditions were found. Means of suppressing nonequilibrium effects in such flows are discussed in terms of the results obtained.

Descriptors:

• *HYPERSONIC FLOW
• *AIR
• *ATMOSPHERE ENTRY
• *NONEQUILIBRIUM FLOW
• SIMULATION
• STAGNATION POINT
• HYPERSONIC NOZZLES
• SHOCK TUBES
• ENTHALPY
• NITROGEN
• ARGON
• OXYGEN
• OXIDES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE