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利用液电脉冲放电产生强有力的激波在碎石、液电清砂等领域获得广泛应用.基于液电脉冲激波实验平台,采用高速摄像机拍摄针–针电极放电形成的电弧膨胀过程,研究了水中放电电弧发展的随机性以及激波强度与电弧膨胀速度的对应关系.放电电弧的击穿路径不规则,激波强度主要取决于传递到电弧通道的功率与能量.电弧长度增加,电流峰值降低,但注入电弧通道的功率与能量增大,电能向机械能的总转换效率提高,激波强度增强.“,”A powerful shock wave induced by underwater pulsed discharge is widely applied in rock fragmentation, and electrohydraulic cleaning, etc. Based on the underwater pulsed discharge platform, a high-speed camera was used to present a time-resolved observation of the arc discharge in the pin-to-pin configuration. The uncertainty of arc channels and the development of the bubble were studied and presented. It shows that the intensity of shock waves is closely related to the power and energy dissipated into the discharge channel. As the arc length increases, the peak value of the discharge current decreases, but the intensity of shock waves increases with the increase of the deposited power and energy into the channel.