Abstract
The design and fabrication are described for a resistojet, the performance of which, during a 25-hr test using hydrogen as a propellant, was a vacuum specific impulse of 840 sec and a thrust of 66.5 g force for 3.0 kw of electric power input. The thruster stagnation conditions were a pressure of 8.8 atm and a gas temperature of 2420°K. The over-all efficiency, which includes the input power of the gas, was 79%. Through a first-law power balance, the performances of the heater and nozzle are separately identified. The nozzle power efficiency based on expansion to space vacuum was 88%. The heater efficiency was found to be 90%. Temperatures throughout the engine are given. The tungsten heat-exchanger fabrication method using vapor-deposition techniques is completely new, allowing almost any shape desired. A large, effective, heat-exchanger surface results in a maximum temperature of the heating element only slightly above the maximum gas temperature. Tungsten sublimation and electrical-insulator temperature, both life-deter mining factors, were minimized in this type design.
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