We investigate the propagation of positive streamers along a profiled dielectric surface in air at atmospheric pressure. Results from experiments and two-dimensional planar low-temperature plasma fluid simulations are presented and analysed. The test object consists of a disk-shaped high voltage electrode and a dielectric slab with 0.5 mm deep corrugations. The corrugated surface has a 47% larger surface area than the smooth reference surface. The experiments and simulations are performed at voltage levels that lead to either gap-bridging or arrested streamers. In both experiments and simulations, the streamers take a longer time to reach the ground electrode when propagating along the profiled surface than along the smooth reference surface. Also, arrested streamers stop closer to the high voltage electrode when a profiled surface is used. Streamers propagate closely along the surface profile in the simulations, which suggests that the observed surface profile effect is mainly a result of elongated streamer channels. Compared to the streamers propagating along the smooth surface, the elongated streamers on the profiled surface have less residual voltage at the streamer front to drive the streamer advancement.

我们研究了正流光在大气压力下沿着异型介电表面在空气中的传播。实验和二维平面低温等离子体流体模拟的结果被呈现和分析。测试对象由盘状高压电极和具有 0.5 mm 深波纹的介电板组成。波纹表面的表面积比光滑的参考表面大 47%。实验和模拟在导致间隙桥接或滞留拖缆的电压水平下进行。在实验和模拟中，拖缆在沿着异形表面传播时比沿着光滑参考表面传播需要更长的时间才能到达接地电极。此外，当使用异型表面时，滞留的拖缆停止更靠近高压电极。在模拟中，拖缆沿着表面轮廓紧密传播，这表明观察到的表面轮廓效应主要是拖缆通道拉长的结果。与沿着光滑表面传播的拖缆相比，异型表面上的细长拖缆在拖缆前端具有较少的残余电压，以驱动拖缆前进。