Two Color Formaldehyde Plif Thermometry Using A Burst Mode Laser

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https://hdl.handle.net/2142/116610

Title: Two Color Formaldehyde Plif Thermometry Using A Burst Mode Laser
Author(s): Liu, Xunchen
Issue Date: 2022-06-20
Keyword(s): Small molecules
Abstract: Two color planar laser induced fluorescence (PLIF) is a robust combustion diagnostics technique to flame temperature field. Widely used OH-PLIF can measure the high temperature post flame front zone, but cannot accurately measure the intermediate temperature pre-flame front region where OH radical concentration is low. Here, the rotational resolved absorption cross section of formaldehyde in this region was analyzed and two peaks at 28183.5 \wn and 28184.5 \wn were selected as the line pair to determine flame temperature. The wavelength region can be easily accessed using the 3$^{rd}$ harmonics of Nd:YAG lasers at 355\,nm. We demonstrate 20\,kHz two dimensional flame temperature field measurement of a laminar coflow diffusion flame, a free jet flame and a reacting jet in hot crossflow using a wavelength-switching injection seeding burst mode laser and a single high speed camera.
Publisher: International Symposium on Molecular Spectroscopy
Type of Resource: text
Language: eng
Handle URL: https://hdl.handle.net/2142/116610&&
DOI: https://doi.org/10.15278/isms.2022.ML03