Experimental Study on Fast Ionization Wave in Supersonic Flow
Experimental Study on Fast Ionization Wave in Supersonic Flow
复制标题
超声速流中快电离波的实验研究
DOI：
10.1541/ieejpes.129.823
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发表时间：
2009
影响因子：
--
通讯作者：
H. Yamasaki
中科院分区：
文献类型：
--
作者：
K. Udagawa;Kengo Matsushima;S. Tomioka;H. Yamasaki
本文介绍了超声速流电离实验的结果。实验采用了马赫数为3的进气道超声速风洞和空气。作为一种电离方法，使用第一电离波（FIW），因为FIW预期产生大量电子，并因此增强风洞壁上的边界层的电导率。实验的主要目的是研究FIW边界层内放电的形成。重复电源的设计，建立和测试。该电源的峰值电压为± 32 kV，脉宽为100 ns，电压快速上升时间为0.6kV/ns，重复频率约为1 kHz。当施加高压脉冲时，在壁附近观察到来自空气的明亮光发射，并且其延伸到下游很长的距离。FIW沿着流的传播使用两个电容电压探头进行了检查。实验结果证实了FIW的传播，其传播速度为4.7× 106 m/s。因此，近壁处的明亮发光归因于由于FIW的传播引起的空气分子的激发和电离。计算了FIW传播过程中产生的等效电场，其峰值为3.0×10-19V·m2。同时，发现该高电场持续时间短（= 3.5ns）。当气体数密度小于3.8× 1024 m-3时，正极性电压比负极性电压能提供更高的约化电场和更短的高电场持续时间。这些结果表明，FIW有可能成为一种有用的超声速流电离方法。
Results of a supersonic flow ionization experiment are described in this paper. In the experiment, the Mach 3 in-draft supersonic wind tunnel and the air were used. As an ionization method, the first ionization wave (FIW) was used because FIW is expected to produce a large number of electrons and as a result, to enhance an electrical conductivity of the boundary layer on a wall of the wind tunnel. The main objective of the experiment was to investigate discharge formation inside the boundary layer by FIW. A repetitive power supply was designed, built-up, and tested. The power supply has shown to provide a peak voltage of ±32kV, a pulse width of 100ns, a rapid voltage rise time of 0.6kV/ns and a repetition rate of about 1kHz. When the high voltage pulse was applied, a bright light emission from the air was observed near the wall, and it extended downstream over a long distance. The propagation of FIW along the flow was examined using two capacitive voltage probes. As a result, the propagation of FIW was confirmed, and its propagation velocity was found 4.7×106m/s. Therefore, the light bright emission near the wall was ascribed to excitation and ionization of air molecules due to the propagation of FIW. The reduced electrical field induced by the FIW propagation was also estimated, and it was relatively high (= 3.0×10-19V·m2) at the peak. At the same time, this high electric field duration time was found short (= 3.5ns). Furthermore, the positive polarity voltage applied to the high voltage electrode was found to provide higher reduced electric field and shorter duration time of high electric field than the negative one for gas number density less than 3.8×1024m-3. From these results, it is suggested that FIW has a possibility to become a useful ionization method for the supersonic flow.
DOI：
10.1007/978-3-642-61247-3
发表时间：
1991-10
期刊：
--
影响因子：
--
作者：
Iu. P. Raizer
通讯作者：
Iu. P. Raizer