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Abstract <p>We studied the dynamics of the plasma glow of a high-voltage nanosecond discharge in a sharply non-uniform electric field in air, nitrogen, and helium in the presence of a soot layer on the surface of a grounded flat anode. The plasma glow was recorded by a four-channel high-speed ICCD camera. The appearance of the discharge was recorded by a full-frame (36 × 24 mm) 30.3 Mpixels camera equipped with a long-focus microscope. It was found that the formation of anode spots in the presence of a soot layer on the surface of the grounded electrode occurs within no more than 10 ns after the arrival of the voltage pulse. The propagation velocity of the plasma glow front formed from the anode spots during discharge in all the gases under study reaches several hundred m/s in the first microsecond after the voltage pulse is applied to the discharge gap. During discharge in air, plasma-assisted ignition and plasma-assisted combustion of a mixture of air and soot vapors were recorded in the discharge gap.</p>

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Glow Dynamics of a Nanosecond Discharge in Air, Nitrogen, and Helium at the Presence of a Soot Layer on the Grounded Anode Surface

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. I. Lomaev

摘要

Abstract

We studied the dynamics of the plasma glow of a high-voltage nanosecond discharge in a sharply non-uniform electric field in air, nitrogen, and helium in the presence of a soot layer on the surface of a grounded flat anode. The plasma glow was recorded by a four-channel high-speed ICCD camera. The appearance of the discharge was recorded by a full-frame (36 × 24 mm) 30.3 Mpixels camera equipped with a long-focus microscope. It was found that the formation of anode spots in the presence of a soot layer on the surface of the grounded electrode occurs within no more than 10 ns after the arrival of the voltage pulse. The propagation velocity of the plasma glow front formed from the anode spots during discharge in all the gases under study reaches several hundred m/s in the first microsecond after the voltage pulse is applied to the discharge gap. During discharge in air, plasma-assisted ignition and plasma-assisted combustion of a mixture of air and soot vapors were recorded in the discharge gap.