Dual-pump CARS measurements in a hydrogen diffusion flame in cross-flow with AC dielectric barrier discharge. (27th March 2018)

• Record Type: Journal Article
• Authors: Nishihara, Munetake; Freund, Jonathan B; Glumac, Nick G; Elliott, Gregory S
• Is Part Of: Plasma sources science & technology. Volume 27:Number 3(2018:Jun.)
• Publication Date: 2018-03-27
• Subjects: CARS -- DBD -- reacting JICF -- PLIF; Plasma (Ionized gases) -- Periodicals; 530.44
• DOI: 10.1088/1361-6595/aab323
• Languages: English
• ISSNs: 0963-0252

Abstract

Abstract: This paper presents dual-pump coherent anti-Stokes Raman scattering (CARS) measurements for simultaneous detection of flow temperature and relative concentration, applied to the characterization of a discharge-coupled reacting jet in a cross flow. The diagnostic is hydrogen Q-branch based, providing a much wider dynamic range compared to detection in the S-branch. For a previously developed dielectric barrier discharge, aligned co-axially with the fuel jet, OH planar laser induced fluorescence measurements show that the disturbance in the flame boundary leads to mixing enhancement. The H2 -N2 dual-pump CARS measurement was used to map two-dimensional temperature distributions. The increase of the maximum temperature was up to 300 K, with 50% more H2 consumption, providing the reason for the decrease in the flame length by 25%. The increase of the relative H2 O-H2 fraction was accompanied with a temperature increase, which indicates local equivalence ratios of below 1. The H2 -O2 dual-pump measurements confirmed that the fuel-oxidizer ratios remain in the fuel-lean side at most of the probed locations.