Optimization of High Voltage Ripples for Alternate Propagations of Streamer Discharges and Water Droplets Produced by Electrospray
Optimization of High Voltage Ripples for Alternate Propagations of Streamer Discharges and Water Droplets Produced by Electrospray
复制标题
电喷雾产生的流光放电和水滴交替传播的高压纹波优化
DOI：
10.1109/icd.2018.8514573
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and Kazunori Kadowaki
中科院分区：
文献类型：
--
作者：
Shinji Yudate;Kanta Tamaru;Ryotaro Ozaki;and Kazunori Kadowaki
作为一种新的水处理技术，有许多研究流光放电传播到气水混合物的电喷雾。通常，很难同时产生流注放电和注射针的水-电喷雾共存状态。在我们之前的报告中，我们通过将重复脉冲叠加到直流电压上，对电喷雾产生的放电和水滴进行了交替传播。然而，为了在实际水平上分解含有难分解物质的溶液，有必要进一步提高静电喷雾的稳定性。很久以前，人们就知道水滴在很小的外力作用下会以自然频率产生很大的脉动。我们认为水滴的脉动有助于提高静电喷雾的稳定性。我们研究了电喷雾针上水滴的等效半径和固有频率。我们发现，在直流正电压上叠加102 Hz量级的高压纹波对电喷雾的稳定性是有效的。然而，tcn的高电压纹波诱发闪络。我们使用纳秒脉冲高电压有一个长尾巴。纳秒级脉冲高压能以很高的概率引发放电传播。我们预期”长尾”的低频成分对水滴的脉动是有效的，从而提高了静电喷雾的稳定性。其结果是，可以成功地实现放电传播和细水雾的交替传播的改善。
For a new water treatment technique, there are many studies on streamer discharge propagation into a gas-water mixture produced by electrospray. Generally, it is difficult to produce both the streamer discharge and the rme water- electrospray from an injection needle as a coexistence state. In our previous report, we carried out alternate propagations of the discharges and water droplets produce by electrospray, by using superimposed repetitive pulses onto a DC Voltage. However, in order to decompose a solution containing a hardly decomposable suUstance at a practical level, it is necessary to further improve the stauility of electrostatic spray. From long ago, it is known that a water droplet pulsates greatly at a natural frequency with a small external force. We thought the pulsation of a water droplet would help to improve the stability of the electrostatic spray. We examined the equivalent radius and natural frequency of the water droplet on the electrospray needle. We find that a superposition of high voltage ripples of the order of102 Hz onto a positive dc voltage is effective for the stability of electro spraying of water. However, the high voltage ripples oftcn induce flashover. We used nanosecond pulse high voltage having a long tail. Nanosecond pulse high voltage can initiate discharge propagations with a high probability. We expected that low frequency component of“ a long tail” is effective for the pulsation of a water droplet and stauility of electrostatic spray improved. As a result, improvement of alternate propagations of the discharge propagation and the fine water-spray could be successfully achieved.