科研之友
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摘要
If two electrodes are stressed with a high voltage which creates a sufficiently strong electric field between the electrodes, the water between the electrodes is breakdown and a highly conductive discharge channel is formed, then discharge happens and sophisticated physical phenomena is involved in this process. Because of the discharge, the resistance of the channel changes from a few kilohms at the beginning of the discharge to only a few milliohms at the metaphase. Therefore, it is not suitable to calculate the discharge current and voltage on the assumption that the resistance of the channel is invariable, although the calculation will be easy by treating it as a constant. Consequently, a time-varying model of the equivalent resistance of the electrodes was established, and the equivalent equation of the discharge circuit was established and solved with the finite difference method. The numerical expression of the discharge current was obtained. Furthermore, the experimental discharge current and voltage waveforms were measured. The comparison of calculations with the experimental results shows that good agreement is achieved when modification of the resistance of the channel is introduced.
- 出版日期2009
- 单位西北工业大学
