High-power, NH3 arcjet cathode lifetime evaluation experiments and plansPreliminary experimental investigations were conducted to evaluate the effects of a modified cathode shape on ammonia arcjet engine performance. The experiments were conducted with a contoured nozzle arcjet in a fully-instrumented facility which included a thrust stand. The modified cathode tip had a reduced diameter and more acute conical tip with respect to the baseline cathode design. A uniform 15 percent decrease in arc voltage was demonstrated over a mass flow range of 0.175 to 0.350 g/s. A 4 percent improvement in thrust efficiency was noted at 22.0 kW. Plans for future cathode testing are discussed with the aim of developing a long-life, high-performance arcjet cathode.
Document ID
19880055094
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Deininger, William D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Pivirotto, Thomas J. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)