Hybrid fs/ps rotational CARS temperature and oxygen measurements in the product gases of canonical flat flames

Kearney, Sean Patrick

doi:10.1016/j.combustflame.2014.11.036

Hybrid fs/ps rotational CARS temperature and oxygen measurements in the product gases of canonical flat flames

Journal Article · Wed Dec 31 00:00:00 EST 2014 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2014.11.036· OSTI ID:1183118

Kearney, Sean Patrick ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

A hybrid fs/ps pure-rotational coherent anti-Stokes Raman scattering (CARS) scheme is systematically evaluated over a wide range of flame conditions in the product gases of two canonical flat-flame burners. Near-transform-limited, broadband femtosecond pump and Stokes pulses impulsively prepare a rotational Raman coherence, which is later probed using a high-energy, frequency-narrow picosecond beam generated by the second-harmonic bandwidth compression scheme that has recently been demonstrated for rotational CARS generation in H₂/air flat flames. The measured spectra are free of collision effects and nonresonant background and can be obtained on a single-shot basis at 1 kHz. The technique is evaluated for temperature/oxygen measurements in near-adiabatic H₂/air flames stabilized on the Hencken burner for equivalence ratios of φ = 0.20–1.20. Thermometry is demonstrated in hydrocarbon/air products for φ = 0.75–3.14 in premixed C₂H₄/air flat flames on the McKenna burner. Reliable spectral fitting is demonstrated for both shot-averaged and single-laser-shot data using a simple phenomenological model. Measurement accuracy is benchmarked by comparison to adiabatic-equilibrium calculations for the H₂/air flames, and by comparison with nanosecond CARS measurements for the C₂H₄/air flames. Quantitative accuracy comparable to nanosecond rotational CARS measurements is observed, while the observed precision in both the temperature and oxygen data is extraordinarily high, exceeding nanosecond CARS, and on par with the best published thermometric precision by femtosecond vibrational CARS in flames, and rotational femtosecond CARS at low temperature. Threshold levels of signal-to-noise ratio to achieve 1–2% precision in temperature and O₂/N₂ ratio are identified. Our results show that pure-rotational fs/ps CARS is a robust and quantitative tool when applied across a wide range of flame conditions spanning lean H₂/air combustion to fuel-rich sooting hydrocarbon flames.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1183118

Alternate ID(s):: OSTI ID: 1246725

Report Number(s):: SAND2014--17275J; 537187

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 162; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Hybrid fs/ps rotational CARS temperature and oxygen measurements in the product gases of canonical flat flames

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