Characteristic of rich-mixture ignition kernel driven by nanosecond repetitive pulsed discharge

作     者：LIN BingXuan WU Yun LI YiWen JIA Min ZONG HaoHua DING Jian LI YingHong 

作者机构：College of Aeronautical and Astronautical Engineering Air Force Engineering University School of Electrical Engineering Xi'an Jiaotong University 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2016年第59卷第1期

页      面：109-116页

核心收录：

学科分类：0810[工学-信息与通信工程] 080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51336011&51522606) the Science Foundation for the Author of National Excellent Doctoral Dissertation of China(Grant No.201172) 

主　　题：plasma assisted ignition NRP discharge rich mixture ignition kernel laminar burning velocity markstein length 

摘      要：Plasma-assisted ignition is a promising technology to improve engine performance. Nanosecond repetitive pulsed discharge is widely used in plasma-assisted ignition owing to its chemical activations and thermal and hydrodynamic expansions. However, the influence of ultrafast heating and hydrodynamic effects on the development of the rich-mixture ignition kernel is largely unknown. The present study aims to illustrate these effects using electrical and schlieren measurement. The number and the frequency of discharge pulses are exactly controlled to establish the relationship among the discharge energy, frequency, and rich-mixture ignition-kernel characteristics. The evolution of the ignition kernel in the early stage is mainly dominated by the discharge energy and frequency, i.e., a greater energy and a higher frequency yield a larger ignition kernel. Moreover, the influence of both the energy and frequency on the ignition kernel gradually disappears as the ignition kernel develops. According to the experimental data and theoretical analysis, the calculated laminar burning velocity is 0.319 m/s with a Markstein length of 13.43±0.11 cm when the voltage is 5.9 k V, the frequency is 3 k Hz, and the equivalence ratio is 1.3. This result indicates that the rich-mixture flame is stable in the early stage of ignition.