Abstract
The effects of DC applied magnetic fields and the configuration of the discharge-channel on the performance of teflon PPTs which input energy is 15J, 30J and 125J, respectively, were studied. The results of the experiments showed that, when the accelerating magnetic field was applied, high specific impulse (-4000s) and high thrust efficiency (-34%) can be achieved and also, both impulse bit and mass shot were decreased. When the electrode length was elongated than the propellant channel length, impulse bit and mass shot were decreased and specific impulse and thrust efficiency were increased. The results of the measurements of propellant vaporization distribution along streamwise direction suggested that the cause of improvement of specific impulse and thrust efficiency by the elongation of electrode is the suppression of excessive propellant sublimation at the propellant-channel end.
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