Resolution-doubled one-dimensional wavelength modulation spectroscopy tomography for flame flatness validation of a flat-flame burner

Chang Liu, Lijun Xu*, Fangyan Li, Zhang Cao, Stylianos A. Tsekenis, Hugh McCann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Flame flatness is one of the most critical factors in evaluating the performance of a flat-flame burner. In this paper, the flame flatness of a flat-flame burner is validated using a resolution-doubled one-dimensional wavelength modulation spectroscopy tomography (1D-WMST) technique that only uses one view of multiple parallel laser beams. When the interval of two neighboring parallel laser beams is Δr, a designed novel geometry of the parallel laser beams realizes a doubled tomographic resolution of Δr/2. Using the proposed technique, the distributions of temperature and H2O mole fraction in an axisymmetric premixed flame are simultaneously reconstructed and hence the flame flatness of a flat-flame burner can be validated. The flatness factor is quantitatively described by the similarity between the reconstructed and expected distributions of H2O mole fraction. For flat and non-flat flames, the experimental results agree well with the CFD simulation results, denoting that the resolution-doubled 1D-WMST technique provides a noninvasive, reliable and low cost way to validate the flame flatness of the flat-flame burner.

Original languageEnglish
Pages (from-to)407-416
Number of pages10
JournalApplied Physics B: Lasers and Optics
Volume120
Issue number3
DOIs
Publication statusPublished - 11 Jun 2015

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