基于紧凑重复频率Tesla变压器实验平台,运用设计加工的紧凑型内部气流循环式火花隙开关,对吹气提高火花隙开关重复频率运行性能进行系统的实验研究,结果表明:重复频率小于50 Hz时,火花隙开关击穿电压不稳定度(RMS)小于5%,不需要吹气;在给定吹气速度下,火花隙开关重复频率运行存在临界重复频率;火花隙开关重复频率运行存在最佳吹气速度,且最佳吹气速度与重复频率之间满足线性关系,并可由实验确定;在优化吹气速度条件下,当气压处于0.7~1.5 MPa范围时,该火花隙开关击穿电压不稳定度(RMS)小于3%;在2.0 MPa的压强范围内,该吹气式火花隙开关可稳定工作至重复频率300 Hz,击穿电压400 kV。

Effect of gas flow velocity on repetitive operation performance was experimentally investigated for a spark gap switch with a compact gas blowing system,based on a compact repetitive Tesla transformer. The experimental results were presented and analyzed. The conclusions are shown as follows:(1) for a repetition rate lower than 50 Hz,the pulse-to-pulse instability (RMS) of the breakdown voltage of the spark gap switch is smaller than 5% and it is possible to spare a gas blowing system;(2) given a gas flow velocity,there exists a critical repetition rate for the stable operation of the spark gap switch;(3) for the repetitive operation of the switch in a given repetition rate,there exists an optimal fan frequency,which is linear with the repetition rate and can be determined by experiment;(4) at the optimal fan frequency,the instability of the breakdown voltage of the switch is smaller than 3% for gas pressure ranging from 0.7 MPa to 1.5 MPa;(5) the compact repetitive spark gap switch with the gas blowing system can steadily operate at the breakdown voltage up to 400 kV for a maximal repetition rate of 300 Hz in the gas pressure lower than 2.0 MPa.