中国电机工程学报2017，Vol.37Issue(10)：2807-2815,9.DOI:10.13334/j.0258-8013.pcsee.170263
水间隙击穿放电模式对激波强度的影响分析
Effect of Electrical Breakdown Discharge Modes on Shock Wave Intensity in Water
刘思维 1刘毅 1李显东 1李化 1张钦 1林福昌1
作者信息
- 1. 强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074
- 折叠
摘要
Abstract
Shock waves generated by underwater pulsed discharge have been applied to industrial and bio-medical treatments,and the key technology is to induce powerful shock waves steadily and efficiently.Based on the underwater pulsed discharge platform,the effect of the electrical breakdown discharge modes on the shock wave intensity in water is discussed in the pin-to-plate configuration.Based on the analysis of discharge images captured by a high-speed camera,it can be concluded that the discharge modes are classified as subsonic bush-like streamers or supersonic filamentary streamers.Experimental results demonstrate that the amplitude of applied voltage has a great influence on the discharge modes as well as the shock wave intensity.The mechanism of the subsonic streamer in lower applied voltage is more likely a electrothermal process.The microbubbles are firstly generated and then discharge occurs in the bubble cluster.The volume of bubbles grows until a breakdown of the underwater gap,and the shock wave is generated.The time delay of the subsonic streamer is within hundreds of μs.In higher applied voltage,the energy loss in the pre-breakdown process are reduced significantly as well.In the experimental conditions a threshold value of 22.5kV is necessary for the subsonic streamers turning into supersonic streamers.The electrical breakdown discharge modes can be controlled by changing the applied voltage,and the intensity of the shock wave differs 2～4 times in different discharge modes even in the same applied voltage.关键词
脉冲放电/超音速流注/亚音速流柱/激波/击穿Key words
pulsed power/supersonic streamer/subsonic streamer/shock wave/breakdown分类
信息技术与安全科学引用本文复制引用
刘思维,刘毅,李显东,李化,张钦,林福昌..水间隙击穿放电模式对激波强度的影响分析[J].中国电机工程学报,2017,37(10):2807-2815,9.
