Abstract
The paper relates to the investigations of a low-current discharge in a vortex airflow with the electrode configuration corresponding to classical coaxial plasmatron. The gas flow rate is varied from 0.1 to 0.3 g/s at an inner diameter of the plasmatron nozzle of 5 mm. The discharge is powered by dc voltage via a ballast resistor. Typical averaged current is changed from 0.06 to 0.15 A so that a maximum averaged power dissipated in the discharge amounts to 160 W. In these conditions, a luminous gas region at the plasmatron exit, which in most publications is associated with a plasma jet, is observed. The method for the jet diagnostics based on a usage of the additional electrodes at the plasmatron exit has been proposed. The main idea of the experiments is the elucidation of the problem whether the jet actually represents the plasma area or we have to apply the term “plasma” with care. In particular, in the case under discussion the main charged particles in the jet are electrons that are emitted from a plasma column located in the plasmatron nozzle. The model that describes the formation of electron flow in the jet has been proposed. Typical electron density in the jet estimated with a usage of the model is at a level of 109 cm−3.
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This work was supported by the Russian Foundation for Basic Research under the grant 17-08-00636.
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Korolev, Y.D., Nekhoroshev, V.O., Frants, O.B. et al. Features of the Current Sustainment in a Low-Current Discharge in Airflow. Plasma Chem Plasma Process 39, 1519–1532 (2019). https://doi.org/10.1007/s11090-019-10016-7
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DOI: https://doi.org/10.1007/s11090-019-10016-7