Abstract
When operating a cathodic arc discharge in quiescent air, a high-speed jet of gas is produced near the cathode, known as the cathodic arc jet (CAJ). To obtain time resolved measurements of the CAJ propagation, a high-resolution spatial spectroscopy technique was implemented. Measurement results show a weak dependence on discharge current magnitude. The CAJ propagation corresponds well with a Taylor–Sedov blast-wave model, with an explosive yield ∼0.5% of the arc energy. At 0.25 s after discharge ignition the instantaneous speed of the CAJ is ∼5 km s−1 and after 1 s the CAJ slows to a sonic speed. These results imply that the CAJ is effective for flow manipulation when operated at single pulse durations of several micro-seconds.
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