Dual-pulse laser-induced spark ignition and flame propagation of a methane diffusion jet flame

Lydia Wermer, James Hansson, Seong Kyun Im

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The ignition and flame propagation behaviors of a CH4 diffusion jet flame were studied when dual pulse laser-induced spark discharges were introduced in a mixing layer. Time intervals of 50 nsec 100 μsec and 600 μsec between two laser pulses were evaluated and the results were compared to a single pulse discharge case with the same total laser energy (60 mJ). Interactions between two laser-induced breakdowns increased the surface area of hot plumes but the effects of the interactions diminished when the breakdowns were introduced in a non-reacting air jet. The effects of the flow on the hot plumes prevailed the interaction effects between two breakdowns in non-reacting air jet condition. However when the dual pulse laser-induced spark discharges were generated in a mixing layer of a methane jet a rapid propagation of the flame was observed since the second breakdown enlarged the ignition kernel surfaces generated by the first breakdown. Using the dual pulse with intervals shorter than the electron lifetime scale or longer than the chemical delay time scale could be beneficial in enhancing ignition and flame propagation processes due to the increased energy deposition or hot surface area respectively. The shockwave and hot plume induced by the second laser pulse significantly interacted with the density gradient produced by heat release through the combustion.

Original languageEnglish
Pages (from-to)4427-4434
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number3
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Fingerprint

spark ignition
diffusion flames
flame propagation
Methane
Electric sparks
Ignition
Laser pulses
methane
breakdown
propagation
pulses
ignition
lasers
plumes
electric sparks
air jets
Lasers
hot surfaces
intervals
Air

Keywords

  • Diffusion flame
  • Ignition
  • Laser-induced breakdown
  • Schlieren imaging

ASJC Scopus subject areas

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

Cite this

Dual-pulse laser-induced spark ignition and flame propagation of a methane diffusion jet flame. / Wermer, Lydia; Hansson, James; Im, Seong Kyun.

In: Proceedings of the Combustion Institute, Vol. 36, No. 3, 01.01.2017, p. 4427-4434.

Research output: Contribution to journalArticle

@article{dd633d2263a24467981aa98533191022,
title = "Dual-pulse laser-induced spark ignition and flame propagation of a methane diffusion jet flame",
abstract = "The ignition and flame propagation behaviors of a CH4 diffusion jet flame were studied when dual pulse laser-induced spark discharges were introduced in a mixing layer. Time intervals of 50 nsec 100 μsec and 600 μsec between two laser pulses were evaluated and the results were compared to a single pulse discharge case with the same total laser energy (60 mJ). Interactions between two laser-induced breakdowns increased the surface area of hot plumes but the effects of the interactions diminished when the breakdowns were introduced in a non-reacting air jet. The effects of the flow on the hot plumes prevailed the interaction effects between two breakdowns in non-reacting air jet condition. However when the dual pulse laser-induced spark discharges were generated in a mixing layer of a methane jet a rapid propagation of the flame was observed since the second breakdown enlarged the ignition kernel surfaces generated by the first breakdown. Using the dual pulse with intervals shorter than the electron lifetime scale or longer than the chemical delay time scale could be beneficial in enhancing ignition and flame propagation processes due to the increased energy deposition or hot surface area respectively. The shockwave and hot plume induced by the second laser pulse significantly interacted with the density gradient produced by heat release through the combustion.",
keywords = "Diffusion flame, Ignition, Laser-induced breakdown, Schlieren imaging",
author = "Lydia Wermer and James Hansson and Im, {Seong Kyun}",
year = "2017",
month = "1",
day = "1",
doi = "10.1016/j.proci.2016.07.115",
language = "English",
volume = "36",
pages = "4427--4434",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
publisher = "Elsevier Limited",
number = "3",

}

TY - JOUR

T1 - Dual-pulse laser-induced spark ignition and flame propagation of a methane diffusion jet flame

AU - Wermer, Lydia

AU - Hansson, James

AU - Im, Seong Kyun

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The ignition and flame propagation behaviors of a CH4 diffusion jet flame were studied when dual pulse laser-induced spark discharges were introduced in a mixing layer. Time intervals of 50 nsec 100 μsec and 600 μsec between two laser pulses were evaluated and the results were compared to a single pulse discharge case with the same total laser energy (60 mJ). Interactions between two laser-induced breakdowns increased the surface area of hot plumes but the effects of the interactions diminished when the breakdowns were introduced in a non-reacting air jet. The effects of the flow on the hot plumes prevailed the interaction effects between two breakdowns in non-reacting air jet condition. However when the dual pulse laser-induced spark discharges were generated in a mixing layer of a methane jet a rapid propagation of the flame was observed since the second breakdown enlarged the ignition kernel surfaces generated by the first breakdown. Using the dual pulse with intervals shorter than the electron lifetime scale or longer than the chemical delay time scale could be beneficial in enhancing ignition and flame propagation processes due to the increased energy deposition or hot surface area respectively. The shockwave and hot plume induced by the second laser pulse significantly interacted with the density gradient produced by heat release through the combustion.

AB - The ignition and flame propagation behaviors of a CH4 diffusion jet flame were studied when dual pulse laser-induced spark discharges were introduced in a mixing layer. Time intervals of 50 nsec 100 μsec and 600 μsec between two laser pulses were evaluated and the results were compared to a single pulse discharge case with the same total laser energy (60 mJ). Interactions between two laser-induced breakdowns increased the surface area of hot plumes but the effects of the interactions diminished when the breakdowns were introduced in a non-reacting air jet. The effects of the flow on the hot plumes prevailed the interaction effects between two breakdowns in non-reacting air jet condition. However when the dual pulse laser-induced spark discharges were generated in a mixing layer of a methane jet a rapid propagation of the flame was observed since the second breakdown enlarged the ignition kernel surfaces generated by the first breakdown. Using the dual pulse with intervals shorter than the electron lifetime scale or longer than the chemical delay time scale could be beneficial in enhancing ignition and flame propagation processes due to the increased energy deposition or hot surface area respectively. The shockwave and hot plume induced by the second laser pulse significantly interacted with the density gradient produced by heat release through the combustion.

KW - Diffusion flame

KW - Ignition

KW - Laser-induced breakdown

KW - Schlieren imaging

UR - http://www.scopus.com/inward/record.url?scp=85001075458&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85001075458&partnerID=8YFLogxK

U2 - 10.1016/j.proci.2016.07.115

DO - 10.1016/j.proci.2016.07.115

M3 - Article

AN - SCOPUS:85001075458

VL - 36

SP - 4427

EP - 4434

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

IS - 3

ER -