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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors
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Thermal re-ignition processes of switching arcs with various gas-blast using voltage application highly controlled by powersemiconductors

机译：使用PowerSemictore高度控制的电压应用，具有各种气体爆破的弧形电弧的热再点火过程

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摘要

This paper focuses on a fundamental experimental approach to thermal arc re-ignition processes in a variety of gas flows in a nozzle. Using power semiconductor switches in the experimental system, the arc current and the voltage applied to the arc were controlled with precise timing. With this system, residual arcs were created in decaying phase under free recovery conditions; arc re-ignition was then intentionally instigated by application of artificial voltage-i.e. quasi-transient recovery voltage-to study the arc behaviour in both decaying and re-ignition phases. In this study, SF6, CO2, N-2, O-2, air and Ar arcs were intentionally re-ignited by quasi-TRV application at 20 mu s delay time from initiation of free recovery condition. Through these experiments, the electron density at the nozzle throat was measured using a laser Thomson scattering method together with high speed video camera observation during the re-ignition process. Temporal variations in the electron density from the arc decaying to re-ignition phases were successfully obtained for each gas-blast arc at the nozzle throat. In addition, initial dielectric recovery properties of SF6, CO2, air and Ar arcs were measured under the same conditions. These data will be useful in the fundamental elucidation of thermal arc re-ignition processes.
机译：本文侧重于喷嘴中各种气体中热弧再点火过程的基本实验方法。使用实验系统中的功率半导体开关，通过精确的定时控制电弧电流和施加到电弧的电压。利用该系统，在自由恢复条件下在衰变阶段创建残留弧;然后通过应用人工电压-i.e有意地煽动电弧再点火。准瞬态恢复电压 - 研究衰减和重新点火阶段中的弧行为。在本研究中，SF6，CO2，N-2，O-2，空气和AR弧被用在20μs的延迟时间从自由恢复条件开始时被预测到20μS延迟时间来点燃。通过这些实验，在重新点火过程中，使用激光汤姆森散射法测量喷嘴喉部的电子密度。对于喷嘴喉部处的每个气体喷射弧，成功地获得了来自电弧衰减到重新点火阶段的电子密度的时间变化。另外，在相同的条件下测量SF6，CO2，空气和Ar弧的初始介电回收性质。这些数据对于热弧再点火过程的基本阐明是有用的。

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