磁旋转电弧中热阴极弧根形态的实验研究
发布时间：2018-04-22 05:12
本文选题：磁旋转电弧 + 阴极弧根 ； 参考：《高电压技术》2014年10期
【摘要】：阴极弧根形态对电弧状态和电极损耗有着重要影响。在同轴电极磁旋转电弧等离子体发生器中,利用高速CCD观察了阴极弧根斑点形态随外加轴向磁场的演化过程,采用双波长法从CCD影像得到阴极端面温度分布;利用水冷电探针对近阴极区等离子体参数进行诊断,得到了阴极附近电子温度及阴极区位降。实验结果表明:(1)在50 A电弧电流下,随着轴向磁场从0.01 T增加到0.02 T,阴极端面最高温度下降,阴极弧根斑点增大,阴极附近等离子体电子温度逐渐降低,阴极弧根为收缩模式;(2)在100 A电弧弧电流下,轴向磁场从0.01 T增加至0.015T,阴极状态变化趋势与前相同;(3)在100 A电弧弧电流下,当轴向磁场增大到0.02 T时,弧根斑点弥散均匀,阴极区位降明显升高,阴极弧根模式由收缩模式转变为扩散模式。分析认为,磁旋转电弧中弧根模式的转变是一个突变的过程。
[Abstract]:The shape of cathode arc has an important effect on the arc state and electrode loss. In the coaxial electrode magnetic rotating arc plasma generator, the evolution process of the cathode arc root spot shape with the applied axial magnetic field was observed by high speed CCD. The temperature distribution of the cathode end surface was obtained from the CCD image by using the dual wavelength method. The electron temperature near the cathode and the cathode location drop were obtained by using the water-cooled electric probe to diagnose the plasma parameters near the cathode. The experimental results show that at 50 A arc current, with the axial magnetic field increasing from 0.01 T to 0.02 T, the maximum temperature of the cathode end surface decreases, the spot of the cathode arc root increases, and the electron temperature of the plasma near the cathode decreases gradually. At 100A arc current, the axial magnetic field increases from 0.01T to 0.015T, and the cathode state changes with the same trend as before.) at 100A arc arc current, when the axial magnetic field increases to 0.02 T, the arc root spots disperse uniformly. The cathode location drop increased obviously, and the cathodic arc root model changed from the contraction mode to the diffusion mode. It is considered that the transformation of arc root mode in magnetic rotation arc is a sudden process.
【作者单位】： 中国科学技术大学;合肥通用机械研究院;中国科学院合肥物质科学研究院;
【基金】：国家自然科学基金(11035005;50876101) 中科院创新仪器研制基金(Y201162)~~
【分类号】：TM501.2
【参考文献】
中国期刊全文数据库 前2条
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本文编号：1785741
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