Experimental study on thermal characteristics of positive leader discharges using Mach-Zehnder interferometry
Experimental study on thermal characteristics of positive leader discharges using Mach-Zehnder interferometry
复制标题
马赫-曾德干涉法正先导放电热特性实验研究
DOI：
10.1063/1.4922660
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发表时间：
2015-06
影响因子：
2.2
通讯作者：
S. Chen
中科院分区：
文献类型：
--
作者：
X. Zhou;R. Zeng;C. Zhuang;S. Chen
Leader discharge is one of the main phases in long air gap breakdown, which is characterized by high temperature and high conductivity. It is of great importance to determine thermal characteristics of leader discharges. In this paper, a long-optical-path Mach-Zehnder interferometer was set up to measure the thermal parameters (thermal diameter, gas density, and gas temperature) of positive leader discharges in atmospheric air. IEC standard positive switching impulse voltages were applied to a near-one-meter point-plane air gap. Filamentary channels with high gas temperature and low density corresponding to leader discharges were observed as significant distortions in the interference fringe images. Typical diameters of the entire heated channel range from 1.5 mm to 3.5 mm with an average expansion velocity of 6.7 m/s. In contrast, typical diameters of the intensely heated region with a sharp gas density reduction range from 0.4 mm to 1.1 mm, about one third of the entire heated channel. The radial distribution of the gas density is calculated from the fringe displacements by performing an Abel inverse transform. The typical calculated gas density reduction in the center of a propagating leader channel is 80% to 90%, corresponding to a gas temperature of 1500 K to 3000 K based on the ideal gas law. Leaders tend to terminate if the central temperature is below 1500 K.
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影响因子：
3.2
作者：
M. Deutsch;I. Beniaminy
通讯作者：
M. Deutsch;I. Beniaminy
影响因子：
3.8
作者：
J. Röpcke;G. Lombardi;A. Rousseau;P. Davies
通讯作者：
J. Röpcke;G. Lombardi;A. Rousseau;P. Davies
影响因子：
3.2
作者：
S. Larigaldie
通讯作者：
S. Larigaldie
DOI：
10.1088/0022-3727/33/18/310
发表时间：
2000-09
期刊：
Journal of Physics D
影响因子：
--
作者：
F. Leipold;R. Stark;A. El-Habachi;K. Schoenbach
通讯作者：
F. Leipold;R. Stark;A. El-Habachi;K. Schoenbach
DOI：
10.1049/piee.1978.0186
发表时间：
1978-08
期刊：
--
影响因子：
--
作者：
A. Kurimoto;O. Farish;D. Tedford
通讯作者：
A. Kurimoto;O. Farish;D. Tedford