Initial pressure of the shock front launched by a streamer discharge in water

Xiaodong Xue,Yuantian Yang,Xue Wang,Xiaoqiong Wen,Liru Wang

doi:10.1063/5.0058134

Abstract

A streamer discharge in water launches a chain of isolated shock fronts as the streamer filament propagates through the water. The initial pressure of the shock front is a good estimation of the initial pressure of the streamer filament. We observed the temporal evolution of the shock front launched by a microsecond pulsed positive streamer discharge in water and investigated the initial pressure of the shock front. We discovered a method for determining the radius of the shock front measured from different discharge pulses in an accurate time sequence and obtained the temporal evolution of the shock front radius. Based on the measured temporal evolution of the shock front radius, we obtained that the initial pressure of the shock front is ∼0.6 GPa. We found that applied voltage and water conductivity do not affect the initial pressure of the shock front within the range studied.

Highlights

The propagation speed of the shock front generated by a streamer discharge in water is usually obtained by measuring the temporal evolution of the radius of the shock front
In order to measure the temporal evolution of the radius of a shock front at its initial stage, it is desirable to be able to acquire many successive images from a single discharge pulse within ∼400 ns because the propagation speed of the shock front rapidly decays into the acoustic velocity of water
By measuring the temporal evolution of the radius of the shock front, we deduced the initial pressure of the shock front and investigated its dependence on applied voltage and water conductivity

Summary

Introduction

Katsuki et al.12 and Marinov et al.13 measured the propagation speed of the shock front generated by the streamer discharge in water and investigated the initial pressure of the shock front through the Hugoniot equation. The propagation speed of the shock front generated by a streamer discharge in water is usually obtained by measuring the temporal evolution of the radius of the shock front. In order to measure the temporal evolution of the radius of a shock front at its initial stage, it is desirable to be able to acquire many successive images from a single discharge pulse within ∼400 ns because the propagation speed of the shock front rapidly decays into the acoustic velocity of water.12 In practice, the radius of the shock front is usually obtained by measuring from different discharge pulses.

Results

Conclusion