Kinetic study of plasma-assisted n-dodecane/O 2 /N 2 pyrolysis and oxidation in a nanosecond-pulsed discharge

Hongtao Zhong, Xingqian Mao, Aric C. Rousso, Charles L. Patrick, Chao Yan, Wenbin Xu, Qi Chen, Gerard Wysocki, Yiguang Ju

Research output: Contribution to journalArticle

Abstract

The present study investigates the kinetics of low-temperature pyrolysis and oxidation of n-dodecane/O 2 /N 2 mixtures in a repetitively-pulsed nanosecond discharge experimentally and numerically. Time-resolved TDLAS measurements, steady-state gas chromatography (GC) sampling, and mid-IR dual-modulation Faraday rotation spectroscopy (DM-FRS) measurements are conducted to quantify temperature as well as species formation and evolution. A plasma-assisted n-dodecane pyrolysis and oxidation kinetic model incorporating the reactions involving electronically excited species and NO x chemistry is developed and validated. The results show that a nanosecond discharge can dramatically accelerate n-dodecane pyrolysis and oxidation at low temperatures. The numerical model has a good agreement with experimental data for the major intermediate species. From the pathway analysis, electronically excited N* 2 plays an important role in n-dodecane pyrolysis and oxidation. The results also show that with addition of n-dodecane, NO concentration is reduced considerably, which suggests that there is a strong NO kinetic effect on plasma-assisted low-temperature combustion via NO-RO 2 and NO 2 -fuel radical reaction pathways. This work advances the understandings of the kinetics of plasma-assisted low-temperature fuel oxidation in N 2 /O 2 mixtures.

Original languageEnglish (US)
JournalProceedings of the Combustion Institute
DOIs
StateAccepted/In press - 2020

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Keywords

  • Laser diagnostics
  • Low-temperature chemistry
  • N-Dodecane/O /N mixture
  • Nanosecond pulsed discharge
  • Plasma-assisted combustion

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