To control the ignition and stabilization location of the second stage flame in a sequential combustor, nanosecond repetitively pulsed discharges (NRPD) were generated between three cylindrical electrodes. The NRPD were obtained by repetitively applying high voltage pulses to the central electrode. At operating conditions where the sequential flame was nearly quenched or weakly anchored, it was possible to re-ignite it and to control its location by adjusting the voltage (V) amplitude (5–10 kV) and repetition frequency (f) (1–100 kHz) of NRPD. This plasma enhanced auto-ignition was achieved with an acceptable increase of NO_x emissions. Similar flame stabilization locations can be achieved by blending propane into the fuel stream, from which one could deduce that the auto-ignition delay was reduced by a factor of ten with NRPD. Direct images of the discharge indicated that applied NRPD corresponded to one the following modes depending on V and f: glow, transition and spark. With the electrodes placed downstream of the fuel injection, quenching effect of the cold fuel on NRPD generation was observed, while when the electrodes were positioned upstream of the fuel injection no ignition event could be observed. High speed imaging of OH* chemiluminescence revealed that spatially homogeneous and temporally continuous auto-ignition was much more efficiently triggered by NRPD in spark mode than NRPD in glow mode. High energy efficiency of NRPD was validated by measuring the plasma energy deposition. The result showed that NRPD with a power consumption about 100 W were sufficient to control a 50 kW sequential combustor.

为了控制顺序燃烧器中第二级火焰的点火和稳定位置，在三个圆柱电极之间产生了纳秒级重复脉冲放电（NRPD）。NRPD是通过向中央电极重复施加高压脉冲而获得的。在连续火焰几乎被淬火或锚定不牢固的工作条件下，可以通过调节电压（V）幅度（5-10 kV）和重复频率（f）（1–2）重新点燃并控制其位置。100 kHz）的NRPD。此等离子体增强的自动点火用NO的可接受的增加而得到_X排放。可以通过将丙烷掺入燃料流中来实现类似的火焰稳定位置，从中可以推断出使用NRPD可以将自燃延迟降低10倍。放电的直接图像表明，施加的NRPD对应于以下模式之一，具体取决于V和f：发光，过渡和火花。将电极放置在燃料喷射的下游，观察到冷燃料对NRPD产生的淬灭作用，而当电极位于燃料喷射的上游时，则未观察到点火事件。OH *化学发光的高速成像显示，在火花模式下，NRPD触发的空间均匀性和在时间上连续的自燃比在辉光模式下的NRPD触发的效率高得多。通过测量等离子体能量沉积，证实了NRPD的高能效。结果表明，功耗约为100 W的NRPD足以控制50 kW的顺序燃烧室。