CORRELATION OF NONEQUILIBRIUM CHEMICAL PROPERTIES OF EXPANDING AIR FLOWS.
Technical information series,
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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A correlation was presented which permits characterization of the chemical properties of air in the expanding nonequilibrium flow of a hypersonic aerodynamic test facility. This is a correlation of the non-equilibrium concentrations of the N2, O2, N, O and NO species in terms of reservoir entropy SR. The species concentrations are defined and are presented in units of moles per gm. of mixture. This correlation with entropy is for air expanding from a wide range of reservoir or stagnation enthalpy HRT sub 0 72 to 720 values to a nozzle area ratio AA value of 103. The gas composition at AA 1,000 was determined from existing numerical computations. The reservoir entropy correlation approach is also used to define a percentage oxygen dissociation criterion for the expanding flow. This criterion is them compared to previously published departure from equilibrium and freezing criteria. The performance of existing and proposed hypersonic and hypervelocity test facilities is considered in the context of the foregoing correlation and criteria. As an example of such facilities, and MHD augmented shock tunnel is considered in particular. Author