摘要
以6种固体颗粒和3种液体颗粒作为混合两相体,研究了它们在直流电压下的放电规律.由于直流电压下空间电荷的积累和漂移不能忽略不计,其放电规律与雷电冲击电压下的两相体放电有区别.通过试验研究发现了气固、气液两相体在直流电压下击穿电压和放电路径选择存在不同空气中的变化,介质颗粒的粒径大小对两相体放电路径的选择具有明显的影响规律.当颗粒粒径小于0.01mm时,放电路径选择两相体的概率明显小于选择空气的概率,并且在两相体中击穿放电的电压比空气中要高;当介质颗粒粒径大于0.1mm时,结论与介质颗粒粒径小于0.01mm时相反;但当介质颗粒粒径在0.01mm和0.1mm之间时,放电路径的选择和两相体中击穿电压的大小与直流电压的极性有关.
In this paper 6 kinds of solid-gas mixtures and 3 kinds of solid-gas mixtures are regarded as the two phase-mixtures（TPMs）. Their discharges under DC voltage have been investigated based on the selection of the dis- charge path. Because the flow velocity and conglomeration of space ions are not ignored and must be considered under DC voltage, the discharges are different from that under lightning impulses. By the experimentation of macroparticle sizes in some kinds of TPMs and directly comparative analyses of the percentages of the discharge path in air or TPMs, it reveals the obvious law. When the diameter is less than about 0.01 mm, the discharge path selects not TPMs but air, the percentage of the selection of TPMs is always smaller than 50% in the experiment and the break- down voltage is higher than that in air. However when the diameter is greater than about 0.1 mm, the conclusion is opposite. And when the diameter is in the range of 0.01-0.1 mm, the TPM discharges have a polarity effect. The path selects and breakdown voltage are associated with the polarity of DC voltage.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2013年第3期249-254,共6页
Journal of Wuhan University:Natural Science Edition
基金
中南民族大学高校科研专项资金项目(CZY11003)
关键词
路径选择
两相体
放电
颗粒荷电
直流电压
path selection
two-phase mixture
discharge
particles charging
DC voltage
