Diagnostic Techniques

Abstract

Side by side with the production of high temperature gases one has to think about the measurement of gas thermodynamic state and flow parameters. Among the parameters those which need to be measured are the total and static enthalpy, the gas velocity, the total and static pressure, and the temperature at different modes (translation, rotation, vibration, etc.) for different species (electron temperature, heavy particle translational temperature, heavy particle excitation temperature, etc.). Out of the various flow variables mentioned above, measurement of the static and total pressure may pose little difficulty with small static pressure holes on the side wall of the channel or the body and water-cooled probes for the measurement of the total pressure, although at low pressures special pressure-measuring equipment (thermocouple probe, ion probe, etc.) may be necessary.