Five kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis

Thomas, Levi M.; Lowe, Albyn; Satija, Aman; Masri, Assaad R.; Lucht, Robert P.

doi:10.1016/j.combustflame.2018.11.004

Title: Five kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis

Journal Article · Thu Nov 22 00:00:00 EST 2018 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2018.11.004· OSTI ID:1609417

^[1]; Lowe, Albyn ^[2]; Satija, Aman ^[1]; Masri, Assaad R. ^[2]; Lucht, Robert P. ^[1]

Purdue Univ., West Lafayette, IN (United States)
Univ. of Sydney, NSW (Australia)

We have applied chirped-probe-pulse (CPP) femtosecond (fs) coherent anti-Stokes Raman scattering for 5 kHz temperature measurements in turbulent spray flames. The CPP fs CARS technique has previously been used to perform spectroscopic temperature measurements in highly turbulent laboratory burners with excellent accuracy, precision, temporal resolution, and spatial resolution. In this paper, ultrafast CARS measurements in spray flames are presented as part of a larger effort to provide spatially and temporally resolved temperature fields in harsh spray environments. The Sydney Needle Spray Burner (SYNSBURN^TM) was used to stabilize turbulent spray flames of acetone and ethanol. The burner features a retractable fuel injector so that the droplet density at the nozzle exit could be systematically varied. Results from selected regions of the turbulent spray flames are discussed in detail to highlight the challenges of CPP fs CARS temperature measurements. Sources of spectral distortion due to interaction with droplets are discussed along with an uncertainty analysis. The passage of fuel through the probe volume caused varying levels of signal degradation and resulted in complete signal loss on approximately 10% of the laser shots for dense spray conditions. The interferences are attributed to two separate phenomena and are categorized based on the probable phase of the fuel – liquid or gas. Interference caused by liquid fuel was unavoidable in certain regions at certain operating conditions, but easily identified and removed. Interference from vapor fuel was more problematic as the nitrogen signal was only moderately corrupted in the high-frequency portion of the spectrum, and the temperature was generally biased to higher values. Rejecting individual signal spectra, based on a fitting error threshold, was shown to be effective in excluding shots with significant interference from fuel droplets, but shots with only minor interference require a more-advanced rejection criterion. Analysis of the temperature fields for a few selected conditions is presented showing trends with the atomization quality of the liquid fuel. Fourier analysis revealed hydrodynamic instabilities in the shear layer and relatively weak thermoacoustic instabilities in the reaction zone.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-03ER15391

OSTI ID:: 1609417

Journal Information:: Combustion and Flame, Vol. 200; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Impact of moderate pump–Stokes chirp on femtosecond coherent anti‐Stokes Raman scattering spectra Gu, Mingming; Satija, Aman; Lucht, Robert P. Journal of Raman Spectroscopy, Vol. 51, Issue 1 https://doi.org/10.1002/jrs.5754	journal	October 2019
Turbulent Combustion Modelling and Experiments: Recent Trends and Developments Giusti, A.; Mastorakos, E. Flow, Turbulence and Combustion, Vol. 103, Issue 4 https://doi.org/10.1007/s10494-019-00072-6	journal	November 2019

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Title: Five kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis

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