ELECTRODE CONFIGURATIONS FOR A WIND-TUNNEL HEATER INCORPORATING THE MAGNETICALLY SPUN ELECTRIC ARC
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
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Various magnetically spun arc heater configurations were tested over a range of N flow rates, power levels, and pressures. Results of an evaluation of an arc heater composed of a 0.75in. thoriated-W cathode, a cylindrical Cu anode, and a magnetic-field coil are presented. A study to determine the independent effect of pressure on arc potential difference, heater efficiency, and stagnation enthalpy was conducted with this unit using a series of nozzles with throat diameters of 0.5, 0.25, and 0.125 in. The arc potential difference was essentially independent of the pressure level except for any change in the operating mode. A change in the arc operating mode resulting in transition to a higher arc potential difference was observed between the flow rates of 0.0055 and 0.0075 lbsec using the 0.25-in.-throat-diam nozzle. The highest values of stagnation enthalpy and arc heater efficiency were obtained at the conditions corresponding to the highest arc potential difference.
- Test Facilities, Equipment and Methods