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脉冲等离子体球磨放电的数值模拟研究
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Abstract:
为了研究等离子体球磨罐内部的放电机理，并探索在球磨罐中所添加的磨球材质对放电的影响，本文根据流体理论对球磨罐设备进行了二维建模，模拟了在三种情况下(无填充磨球、氧化铝填充磨球和不锈钢填充磨球)一个脉冲电压周期内球磨罐放电腔体中的放电过程，通过数值分析来对比仿真结果中的各种放电参数，并结合实际球磨罐运行时的放电图片和仿真结果图片体现了建模仿真的可靠性。结果表明，添加金属材质磨球时的放电电流幅值(5.0 A)较无磨球(3.5 A)和氧化铝磨球(3.7 A)情况下都要高，对于放电过程中的最大电子密度，添加金属磨球情况下(2.52 e12/cm3)较无磨球(5.48 e11/cm3)和氧化铝磨球(8.25 e11/cm3)情况下都要高，同时对于像平均功率密度、电子温度和亚稳态粒子密度等参数，都是以金属磨球情况下的数据最大，氧化铝磨球情况下次之，无磨球情况下最小，可见填充磨球可有提高球磨罐内的放电强度，填充金属材质磨球时的这种提高更加显著。
In order to study the discharge mechanism inside the plasma ball milling tank and explore the in-fluence of the material of grinding balls added in the tank on the discharge, a two-dimensional model of the equipment of the ball milling tank was established according to the fluid theory, and the discharge process in the discharge cavity of the ball milling tank was simulated under three conditions (no filled grinding balls, alumina filled grinding balls and stainless steel filled grinding balls) in a pulse voltage cycle. Various discharge parameters in the simulation results were com-pared by numerical analysis, and the modeling was embodied by combining the discharge pictures and simulation results pictures of the actual ball milling tank. The results show that the discharge current amplitude (5.0 A) with metal grinding ball is higher than that without grinding ball (3.5 A) and alumina grinding ball (3.7 A), and the maximum electron density in the discharge process with metal grinding ball (2.52 e12/c m3) is lower than that without grinding ball (5.48 e11/cm3) and alumina grinding ball (8.25 E11). At the same time, for parameters such as average power density, electron temperature and metastable particle density, the data are the largest in the case of metal grinding ball, followed by alumina grinding ball, and the smallest in the case of no grinding ball. It can be seen that filling grinding ball can improve the discharge intensity in the ball milling tank, and this improvement is more detailed when filling metal grinding ball.
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