Reliable and fast ignition is one of the biggest challenges for the development of advanced propulsion systems. In this study, a novel multichannel jet enhanced plasma ignition strategy is proposed. Based on the flow control strategy, the plasma synthetic jet is used to enhance the spark discharge, to enlarge the spark size, and to increase the ignition energy. The multichannel jet enhanced plasma igniter (MJEPI) discharge characteristics, spark evolution, and the ignition process in a single-head swirl combustor were studied and compared with those of the traditional spark igniter. The discharge efficiency can be improved from 33.5% to 42.7% compared with the traditional spark igniter. The heating ratio has a great influence on the performance of MJEPI. A positive return can be obtained only when the heating ratio is greater than about 13.6. The MJEPI significantly enlarges the initial flame kernel which maintains its strength throughout the ignition process. Due to the enhancement of heat exchange and mass transport of the larger initial flame kernel, the lean ignition limit can be extended by 26%-32% at different air flow and the ignition time is obviously reduced by 29.7%. It can be concluded that the MJEPI is worthy to be further studied.

可靠且快速的点火是开发先进推进系统的最大挑战之一。在这项研究中，提出了一种新的多通道射流增强等离子体点火策略。基于流量控制策略，利用等离子体合成射流增强火花放电，扩大火花尺寸，提高点火能量。研究了单头涡流燃烧器的多通道射流增强等离子体点火器（MJEPI）放电特性、火花演化和点火过程，并与传统火花点火器进行了比较。放电效率较传统火花点火器可提高33.5%至42.7%。加热比对 MJEPI 的性能影响很大。只有当加热比大于约 13.6 时才能获得正回报。MJEPI 显着扩大了初始火焰内核，从而在整个点火过程中保持其强度。由于较大的初始火焰核增强了热交换和传质，在不同的空气流量下，稀燃极限可延长26%-32%，点火时间明显缩短29.7%。可以得出结论，MJEPI 值得进一步研究。