Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

Multi-source corona discharge is a commonly used method to generate more charged particles, but the interaction mechanism between multiple discharge sources, which largely determines the overall discharge effect, has still not been studied much. In this work, a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge sources. Specifically, the effects of the number of electrodes, voltage level, and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an example. The calculation results show that, when multiple discharge electrodes operate simultaneously, the superimposed electric field includes multiple components from the electrodes, making the ion distribution and current different from that under a single-blade electrode. The larger the distance between discharge electrodes, the weaker the interaction. When the electrode spacing d is larger than 4 cm, the interaction can be ignored. The results can guide the design of large discharge gap array electrodes to achieve efficient discharge.