等离子体射流的推进机理

作为一种应用前景广阔的新兴等离子体源,大气压下非平衡等离子体射流在近10年的研究中取得了很大进展。为了更有效地利用等离子体射流,人们对其物理机理展开了深入研究,其中等离子体射流的传播机理尤其令人关注。一般认为等离子体射流的传播是受电场驱动的,但是最新的研究表明还存在另外一种驱动方式,即流体驱动。分别对以上两种驱动方式下射流传播的特点和影响因素进行了概述,并对电场驱动等离子体射流传播的空间特性、时间特性、极性效应,以及光电离的作用进行了讨论。流体驱动的等离子体射流与电场驱动的等离子体射流有着完全不同的传播过程,这种射流的传播是通过气流驱动的,具有推进速度相对较低,对电场不敏感等特性。最后,该文对大气压非平衡等离子体射流的传播机理中尚未解决的问题,以及未来的研究方向作了展望。

Propagation of Atmospheric-pressure Cold Plasma Jets

Atmospheric pressure cold plasma jets are widely studied due to their extensive applications.In order to utilize this plasma source more effectively,the physics of plasma jets are investigated.The most attractive spots such as their propagation mechanism are reviewed.It is generally considered that plasma jets are electrically driven,however,latest research shows that in some cases gas flow can also drive plasma jets propagation.As the propagation characteristics of plasma jets driven by electric field and gas flow are entirely different,they are also discussed respectively.In the former case,the spatial structures,dynamics,the effect of polarity of the applied voltage,and the role of photoionization are discussed.In the later case,it is found that they propagate at a relatively low velocity,and are insensitive to electric field.Finally,perspectives on atmospheric-pressure cold plasma jets research are presented.