油中脉冲电弧压力波流固界面动力学特性研究

The intense pressure waves resulting from arc discharges in oil constitute a primary cause of transformer explosions. Understanding the generation, propagation, and effects is of great significance for preventing devasted failures and enhancing equipment safety. This study establishes an optical-electrical diagnostic platform for pulsed arc-induced pressure waves, and employs high-speed schlieren imaging and pressure sensing to clarify pressure generation of arc. A historical matching-based simulation model provides an insight into the influences of tank walls and L-shaped corner on the transient wave propagation. Experimental results agree well with the simulation. It has been shown that tank walls induce the occurrence of a high-velocity jet within collapsing bubbles, and hence intensifying the wall impact. Meanwhile, the pressure waves converge at L-shaped corners, causing localized pressure concentration and structural damage and even break risk of the tank.