ELECTRON TEMPERATURE AND DENSITY MEASUREMENT AHEAD OF STRONG SHOCK WAVES
ELECTRON TEMPERATURE AND DENSITY MEASUREMENT AHEAD OF STRONG SHOCK WAVES
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强冲击波前的电子温度和密度测量
DOI：
10.2514/6.2001-2765
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发表时间：
2001
影响因子：
3.5
通讯作者：
A. Matsuda
中科院分区：
文献类型：
--
作者：
K. Fujita;S. Sato;T. Abe;A. Matsuda
为了了解在激波管实验中观察到的强激波背后的快速电离过程，我们用三探针法测量了前驱区的瞬变等离子体性质，具有较高的信噪比和时间分辨率。用氮气作为试验气体，观察到前驱体中的电子密度随着激波的接近而迅速增加，而激波前的电子温度几乎是均匀的。结果表明，电子密度强烈依赖于激波速度，而电子温度对激波速度不太敏感。在激波速度为12.4 km/S时，激波前20 mm处的电子密度和电子温度分别为1019m~3和7000K。简单的一维分析很好地解释了前驱区域中电子的这种行为，在一维分析中，光致电离被结合为分子氮的主要电离过程。
In order to understand the fast ionization process behind the strong shock wave observed in the previous shock-tube experiment, we measure the transient plasma properties in the precursor region by means of the triple-probe method with the high signal/noise ratio and time resolution. Using nitrogen as the test gas, the electron density in the precursor is observed to increase very quickly as the shock wave approaches, while the electron temperature is almost uniform ahead of the shock wave. The electron density is found to depend strongly upon the shock velocity, while the electron temperature is less sensitive to the shock speed. At the shock velocity of 12.4 km/s, the electron density and the electron temperature are found to be 1019 m~3 and 7000 K, respectively, at 20 mm ahead of the shock wave. Such the behavior of electrons in the precursor region is well accounted for by a simple one-dimensional analysis in which photo-ionization is incorporated as the primary ionization process of molecular nitrogen.