Влияние внешнего потока на характеристики поверхностного барьерного разряда

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Abstract

Проведено исследование влияния вынужденной конвекции газа в разрядной области на рассеиваемую в поверхностном барьерном разряде мощность и динамику зарядки поверхности барьера ионным током. Продемонстрировано, что вследствие конвективного охлаждения разрядной области наблюдается снижение рассеиваемой в разряде мощности, которое может достигать 50% от значений в неподвижном воздухе. Показано, что вследствие переноса облака ионов потоком происходит зарядка дальних областей поверхности барьера конвективным ионным током, что приводит к изменению распределения плотности среднего заряда поверхности.

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About the authors

И. В. Селивонин

Объединенный институт высоких температур РАН

Author for correspondence.
Email: inock691@ya.ru
Russian Federation, Москва

И. А. Моралев

Объединенный институт высоких температур РАН

Email: inock691@ya.ru
Russian Federation, Москва

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Supplementary files

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1. JATS XML
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2. Fig. 1. Schematic diagram of the discharge cell: 1 – corona electrode, 2 – surface barrier discharge, 3 – dielectric barrier, 4 – underlying sectioned electrode, 5 – silicone compound, 6 – switch, 7 – measuring capacitors.

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3. Fig. 2. Oscillograms of the applied voltage (a) and the charge transferred in the barrier discharge (b) when the discharge is powered in the radio pulse mode: 1 – oscillogram envelopes showing the amplitude values ​​of the quantities; 2 – average value of the charge transferred over the period of the supply voltage.

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4. Fig. 3. Flow velocity profiles in the boundary layer at the point of electrode installation: 1 – 20 m/s, 2 – 40, 3 – 60.

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5. Fig. 4. Oscillograms of the applied voltage – 1 and the transferred charge – 2 (a) and the volt-coulomb characteristic of the discharge (b): the shaded area is the energy input into the discharge during the period of the applied voltage.

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6. Fig. 5. Dependence of the power dissipated in the discharge on the amplitude Ua of the applied voltage at different flow velocities (1 – 0 m/s, 2 – 20, 3 – 40, 4 – 60) and discharge orientations in it: (a) – with the flow, (b) – against the flow, (c) – across the flow.

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7. Fig. 6. Dynamics of the average charge Qav of the barrier surface over the period at different flow rates (1 – 0 m/s, 2 – 20, 3 – 40, 4 – 60) and discharge orientations in it: (a) – with the flow, (b) – against the flow, (c) – across the flow; the moment t = 0 ms corresponds to the discharge switching on; the amplitude of the supply voltage is 5 kV.

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8. Fig. 7. Distribution of the charge induced on the dielectric surface at different moments of time after discharge initiation (1 – 50 μs, 2 – 100, 3 – 150, 4 – 250, 5 – 30 ms) at an applied voltage amplitude of 5 kV in still air (a); (b) – image of the discharge at these parameters, obtained with an exposure of 30 ms.

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9. Fig. 8. Distribution of the charge induced on the dielectric surface at different moments in time (1 – 50 μs, 2 – 10 ms, 3 – 15, 4 – 25, 5 – 30) at an incident flow velocity of 60 m/s (a) and at different flow velocities (1 – 0 m/s, 2 – 20, 3 – 40, 4 – 60) at a time of 30 ms after discharge ignition (b): the discharge is oriented downstream, the amplitude of the applied voltage is 5 kV.

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10. Fig. 9. Dynamics of the averaged over the period applied voltage of the barrier surface charge and the charging current at a flow velocity of 60 m/s: the discharge is oriented along the flow, the amplitude of the applied voltage is 5 kV; the start of the count is the moment the discharge is switched on; 1 – charge, 2 – ion current (dq/dt), 3 – ion current (smoothed).

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