Observation and verification of surface electrical explosion driven by radial-distributed pulsed current in laboratory lightning strike test

作     者：Ruoyu Han Yuchen Cao Yakun Liu Xi Chen Ting Li Chen Li Pengfei Li 

作者机构：State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijingChina School of Mechatronical EngineeringBeijing Institute of TechnologyBeijingChina Department of Electrical EngineeringShanghai Jiaotong UniversityShanghaiChina Beijing Institute of Astronautical System EngineeringBeijingChina Aerospace Research Institute of Materials and Processing TechnologyBeijingChina 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2024年第9卷第1期

页      面：137-149页

核心收录：

学科分类：0808[工学-电气工程] 080803[工学-高电压与绝缘技术] 08[工学] 

基　　金：National Natural Science Foundation of China,Grant/Award Number:52277134 Young Elite Scientists Sponsorship Program by CAST,Grant/Award Number:2022QNRC001 Beijing Municipal Natural Science Foundation,Grant/Award Number:3212034 State Key Laboratory of Explosion Science and Technology,Grant/Award Number:QNKT23-02 

主　　题：electrical lightning radial 

摘      要：The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection(LSP).Particularly,direct lightning strike damage can be performed with pulsed current injection into the *** paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the‘strike’point.A rod-plate discharge load is built for testing aluminium and coated plate under 40-kA-level pulsed *** visualisation of the luminous discharge plasma and its flow field via high-speed photography(from different angles)is meticulously designed and implemented,synchronised with electro-physical *** results indicate some new mechanisms for lightning strike damage,apart from the impulse heat loading from the thermal *** transient current injection through the arc root concentrates on a thin skin layer(skin-depth effect),with the radial-attenuated current density,driving asynchronously electrical explosions on the plate *** inhomogeneous Joule heating of the plate leads to outwardly propagating phase transition and shock wave along the conductive *** addition,the electro-thermal instability is observed and regarded as the seed of irregular erosion *** information reveals two different plasma states of main discharge arc channel and adjacent surface electrical *** correspondence of the physical mechanism of electrical explosion and optical radiation is *** images for different regions depict erosion characteristics and summarise influencing factors,further confirming the mechanism *** research clarifies the role of skin-depth effect in transaction arc erosion for electrode,complements the electrical explosion theory with unevenly distributed current and helps optimise strategies of LSP.