A study of the relationship between NOx and the ion current in a direct-injection diesel engine
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- 作者：Rahul Rao ; rrao2.monash@gmail.com ; Damon Honnery
- 关键词：Ion current ; NOx ; Diesel engine ; N-heptane ; Chemical kinetics
- 刊名：Combustion and Flame
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：176
- 期：Complete
- 页码：309-317
- 全文大小：2061 K
- 卷排序：176
文摘
This paper presents a modelling study of the ion current formed in a direct-injection diesel engine via chemical kinetics in order to investigate the strong correlation observed experimentally between tailpipe NOx and the ion current. An established n-heptane mechanism augmented with ionic and NOx sub-mechanisms is used to model the formation of ions and NOx in three combustion systems, including a phenomenological diesel engine model whose validation is also presented here. Sensitivity analyses are conducted on electron and NOx formation to determine species and reactions common to both. The O radical and, by extension, the mixture temperature are found to be important to both NOx and electron concentrations via mechanisms identified here.