Abstract The genesis and development mechanisms of streamers during centimeter gap corona discharge should be thoroughly studied in order to increase the DC transmission system's dependability and plasma output on a commercial scale. Few investigations have been done so far on the streamer discharge in the centimeter-level air gap. Using atmospheric circumstances and an 18 cm rod-plate gap, a simulation model of the plasma chemistry of streamer discharge is built in this article. To check the accuracy of this simulation model, an experimental platform is being developed. Both the Raether and the Meek criteria are predicated on the uniform field, making them inappropriate for determining the flow discharge start at the bar-plate electrode. And the photoelectric ionization criteria is a mathematical model that is based on the highly theoretical flow formation process. Quantitatively solving the model is challenging due to the complexity of the various variable values. The flow is therefore assumed to begin when the electron density exceeds 1018 m-3 in this research based on the experience of flow modeling. This work examines the distribution and development law of charged particles, average electron energy, and electric field intensity in the growth of streamer discharge based on the simulation results. The findings demonstrate that high-energy electrons are mostly present in the head of the streamer, where their ionization reaction leads in a significant production of positive ions, which distorts the spatial electric field. As a result, both the distribution of the spatial electric field and the average electron energy are compatible with the distribution of electron density. The maximum development length l of the streamer and the electric field intensity Es at the head of the streamer under a very uneven electric field are determined in this work using the Raether and Meek criterion as inspirations. The findings indicate that the length of the streamer is less than 6 cm when the electric field distortion of the streamer head is less than one times the average electric field, less than 14.5 cm when the electric field distortion is one to five times the average electric field, and less than 12 times the average electric field when the streamer will break through the rod plate gap. The creation of diffuse zone is mostly caused by the accumulation of negative ion layer. This is due to the negative ion layer's augmentation of the electric field in the plate electrode region, which makes it simpler for electrons to get energy, as well as the intensification of the ionization and excitation reactions. The negative DC rod plate discharge experiment is conducted to ensure the simulation model's accuracy, and the calculated discharge current and experimental discharge current are compared. According to the experimental findings, the streamer and anode glow regions make up the streamer corona. The shape and placement of the streamer, which has a length of approximately 16.66 cm, change depending on the voltage being used. Anode glow area development is mostly due to the distortion of the anode electric field brought on by the negative ion sheath. In summary, the insights reached in this work can serve as a theoretical foundation for explaining the mechanism of streamer discharge formation and development in negative polarity corona discharge as well as plasma preparation.
Li Changyun,Li Yanqing,Yu Yongjin. The Generation and Development Mechanism of Streamers in Centimeter-Level Rod-Plate Gap Negative Corona Discharge under Atmospheric Conditions[J]. Transactions of China Electrotechnical Society, 2024, 39(3): 887-900.
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