| Popis: |
The thrust produced by a Gerdien-type d-c arc-jet using argon gas and exhausting into a low-pressure (approximately 2 mm Hg) test cell was measured and used to determine the momentum losses which occurred in the constant area anode nozzle. From these losses, a loss coefficient is defined which will yield good approximations for the gas total temperature and total pressure at the anode nozzle exit when applied to the standard constant area heat addition equations. The investigation was carried out for anode nozzles of different lengths and led to the fact that nozzle length was not a great contributor to these losses for relatively short nozzles (1.25 to 2.00 in.). Nozzle length was also found to play a very minor role in relation to the other contributing factors in determining the efficiency of the arc-heating process. The arc-jet was operated with gas flow rates of approximately 0.0034, 0.0042, and 0.005 lb/ sec, electrical power input levels ranging from 2.7 to 5.8 kw, chamber pressures ranging from 6.7 to 11.7 psia, and gas inlet temperatures of approximately 530R. |
