Plasma properties and coupling characteristics of shock waves induced by nanosecond-pulse three-electrode dual-spark SDBD

Ice accumulation on windward components of the wind turbine can lead to a significant reduction in efficiency and even trigger security incidents. This work introduces a novel three-electrode dual-spark surface dielectric barrier discharge (SDBD), which combines the streamer mode for de-icing by generating heat and the dual-spark mode for ice breaking via shock waves. Firstly, the characteristics in different discharge modes and the discharge mode transition are investigated using electrical and optical diagnostics, enabling reliable control of the discharge modes. Subsequently, the spatiotemporal evolution of aerodynamic performance induced by pulsed dual-spark discharge is examined through schlieren imaging system. The initial shock wave velocity can reach up to 519 m/s. And the shock wave velocity exhibits a characteristic of exponential decay with time, eventually decaying to the speed of sound and propagating outward. And a pronounced enhancement of pressure wave intensity is observed at the interaction region of the two shock waves.