超临界CO2流体中直流电晕放电特性研究

摘要

实验研究了使用针-板电极的超临界CO2流体中直流电晕的放电特性.实验结果揭示了一个奇特的现象:在CO2超临界流体中,接近超临界点附近的直流击穿电压比通常高压气体状态下的击穿电压低得多.对于这一奇特现象的一个可能的解释是超临界点附近的CO2分子强烈的团族(clusters)形成,这样即使以较低的应用电压,在超临界CO2流体中也可以形成直流电晕放电.%The generation of DC corona discharges in supercritical CO2 using a point-plane electrode is studied experimentally. The results reveal a bizarre situation for CO2 breakdown voltages, which is much lower in near the critical point than the measured in the normal high pressure gas. An explanation is probably because of the extensive cluster formation near the critical position. Therefore, it can be concluded that corona discharge in supercritical fluid condition may be generated with very low voltage.