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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >The critical reduced electric fields in SF6 at high gas temperatures
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The critical reduced electric fields in SF6 at high gas temperatures

机译：高温气体中SF6中的临界减少电场

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摘要

In this paper, the critical reduced electric fields (E/N) cr in SF6 are determined over a temperature range 298-2300 K. These fields are derived from the quasi-stationary burning voltages of a self-sustained volume discharge in SF6 irradiated by a CO2-laser through a slit diaphragm. Visualization of the shock-wave disturbances generated by the temperature jump at the boundary between the laser-heated and cold gas and measurements of the discontinuity surface propagation velocities are performed. A purpose-developed V-Sh method allowing determination of the gas temperature T by the shock wave propagation velocity has been proposed to evaluate the temperatures exceeding 1500 K. The (E/N)(cr)-values obtained at T > 2000K are compared with those measured under the conditions of the complete thermodynamic equilibrium. The difference found is treated in terms of the authors' concept of the dielectric strength of strongly heated electronegative polyatomic gases. A number of fundamentally new physical effects are shown to arise at the discontinuity surfaces in a shock-wave-disturbed SF6 after voltage application. Some aspects of relevance to these effects are qualitatively discussed. Special attention is given to the dynamic barrier effect.
机译：在本文中，确定了SF6中的临界还原电场（E / N）cr在298-2300 K的温度范围内。这些场是从SF6的自持续体积放电的准静态燃烧电压得出的，SF6由通过狭缝隔膜的二氧化碳激光器。可视化由激光加热的气体和冷的气体之间的边界处的温度跃迁产生的冲击波扰动，并测量不连续面的传播速度。已经提出了一种专门开发的V-Sh方法，该方法允许通过冲击波传播速度确定气体温度T，以评估超过1500 K的温度。比较了T> 2000K时获得的（E / N）（cr）值与在完全热力学平衡条件下测得的结果一致。根据作者关于强加热的负电多原子气体的介电强度的概念来处理发现的差异。施加电压后，在受到冲击波干扰的SF6中，在不连续表面处会出现许多根本上新的物理效应。定性地讨论了与这些影响有关的某些方面。特别注意动态势垒效应。

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