Abstract
Flow properties are determined from recent experimental measurements in the Aerodynamic Heat- ing Facility (AHF) Arcjet at NASA Ames Research Center. In the experiments, two-photon Laser-Induced Fluorescence (LIF) is used to measure flow velocity, translational temperature, and atomic nitrogen con- centrations over a range of facility operating conditions for air/argon gas mixtures. Sensitivities of the mea- sured flow properties to changes in primary arcjet con- trol parameters, pressure and current, are examined. With additional facility data and certain assumptions the flow property measurements are used to determine the centerline enthalpy and its apportionment into ki- netic, thermal, and chemical contributions. Compar- isons of the relative modal contributions to the total enthalpy and results from previous LIF measurements in the AHF are used to assess the validity of the as- sumptions. Based on the analysis of the experimental measurements, conclusions are drawn about the ther- mochemical state of the nonequilibrium free stream flow.
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