Abstract
An effect of cross-section in electrode on the thrust efficiency has been studied by using an MHD accelerator which consists of a pulsed-power system and a model rocket engine. In order to estimate the thrust efficiency, temperature and velocity of combustion gas were measured by fitting the radiation temperature assuming blackbody and time-of-flight method. The results indicated that the thrust efficiency of the pulsed-MHD accelerator is improved when the cross-section of electrode is decreased. Because of the higher current density generates the stronger electromagnetic force for the smaller electrode.
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