Streamer discharges occur in the early stages of electric breakdown of gases in lightning, as well as in plasma and high voltage technology. They are growing filaments characterized by a curved charge layer at their tip that enhances the electric field ahead of them. In this study, we analyze the effect of strong electron attachment on the propagation of positive streamers. Strong attachment occurs in insulating gases like sulphur hexafluoride (SF₆) or in air at increased density. We use the classical fluid approximation with photo-ionization for streamers in ambient air, and we artificially increase the electron attachment rate where the field is below the breakdown value. This modification approximates air pressures above 1bar at room temperature. We find that the streamer head can keep propagating even though the ionized channel loses its conductivity closely behind the head; hence, even if it is electrically isolated. We describe how, depending on the attachment rate, the streamer propagation in a constant electric field can be accelerating, uniformly translating, or stagnating.

流光放电发生在闪电中气体电击穿的早期阶段，以及等离子和高压技术中。它们是生长中的细丝，其尖端具有弯曲的电荷层，可增强其前面的电场。在这项研究中，我们分析了强电子附着对正拖缆的传播的影响。在诸如六氟化硫（SF ₆）或在空气中以更高的密度。我们对环境空气中的拖缆使用经典的光电离流体近似方法，并在电场低于击穿值的情况下人为地提高了电子附着率。在室温下，此修改近似于高于1bar的气压。我们发现，即使离子通道在其头部紧后面失去导电性，拖缆头仍可继续传播。因此，即使它是电气隔离的。我们描述了根据附着率，流光在恒定电场中的传播是如何加速，均匀平移或停滞的。