Ignition and flame propagation by dual-pulsed laser-induced breakdowns

Seong Kyun Im, Lydia Wermer, Moonsoo Bak, James Hansson

Research output: Contribution to conferencePaper

Abstract

Experimental investigations of laser-induced spark ignition and flame propagation by successive laser pulses were performed in a stoichiometric methane-air mixture at 4 m/s bulk flow and a methane diffusion jet flame (Re = 5500). Time intervals (dt) of 50 ns and 600 μs between two laser pulses were tested, and the results were compared to a single pulse discharge case with the same total laser energy. High-speed schlieren and CH∗ chemiluminescence imaging techniques were used to visualize the ignition and flame propagation. In a premixed flame, the flame propagation speed was enhanced for successive laser-induced spark ignition with a time interval of 50 ns due to the increased energy deposition to the discharge. Successive laser-induced spark ignition with a time interval of 600 μs induced strong pulse-to-pulse coupling that increases the area of the propagating flame, improving flame propagation speed. In a diffusion flame, a rapid propagation of the flame was observed when the dual pulse laser-induced spark discharges (dt = 600 μs) are generated in a mixing layer of a methane jet since the second breakdown enlarges the ignition kernel surfaces generated by the first breakdown.

Original languageEnglish
Publication statusPublished - 2016 Jan 1
Externally publishedYes
Event2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016 - Princeton, United States
Duration: 2016 Mar 132016 Mar 16

Conference

Conference2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016
CountryUnited States
CityPrinceton
Period16/3/1316/3/16

Fingerprint

flame propagation
Pulsed lasers
ignition
Ignition
pulsed lasers
Electric sparks
breakdown
Laser pulses
Methane
propagation
spark ignition
Lasers
lasers
pulses
methane
diffusion flames
intervals
flames
Chemiluminescence
electric sparks

ASJC Scopus subject areas

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

Cite this

Im, S. K., Wermer, L., Bak, M., & Hansson, J. (2016). Ignition and flame propagation by dual-pulsed laser-induced breakdowns. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.

Ignition and flame propagation by dual-pulsed laser-induced breakdowns. / Im, Seong Kyun; Wermer, Lydia; Bak, Moonsoo; Hansson, James.

2016. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.

Research output: Contribution to conferencePaper

Im, SK, Wermer, L, Bak, M & Hansson, J 2016, 'Ignition and flame propagation by dual-pulsed laser-induced breakdowns' Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States, 16/3/13 - 16/3/16, .
Im SK, Wermer L, Bak M, Hansson J. Ignition and flame propagation by dual-pulsed laser-induced breakdowns. 2016. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.
Im, Seong Kyun ; Wermer, Lydia ; Bak, Moonsoo ; Hansson, James. / Ignition and flame propagation by dual-pulsed laser-induced breakdowns. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.
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