Interpreting diffusion flame structure by simultaneous mixture fraction and temperature measurements using optical and acoustic signals from laser-induced plasmas
نویسندگان
چکیده
The measurement of mixture fraction and temperature is great importance in non-premixed flame structure studies combustion optimization. However, obtaining profiles simultaneously for a wide range fuels compositions has proven to be challenging, especially when suitable spatial temporal resolutions are desired. In this study, the acoustic optical signals from laser induced plasmas were used first time obtain acoustic-based laser-induced breakdown thermometry (LIBT) combined with spectroscopy (LIBS). system was calibrated an ethylene-air premixed flame. Then atomic-ratio distributions along centerline ethylene counterflow diffusion measured. strong compositional gradients flames represents potential challenge, but simultaneous measurements successfully performed within 1.5 mm physical region, where equivalence ratio ranged 0.5 12 1100 K 2000 K. elemental mass fractions distribution inferred based on measured atomic distributions. preferential H relative C directly observed by C/H ratio. Lastly, physics behind LIBT technique discussed analyzed. This work demonstrates that combination LIBS holds promise as simple tool measure broader conditions; facilitates better understanding structure.
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ژورنال
عنوان ژورنال: Proceedings of the Combustion Institute
سال: 2021
ISSN: ['1873-2704', '1540-7489']
DOI: https://doi.org/10.1016/j.proci.2020.06.319