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dc.contributor.authorThomas, Levi M.
dc.contributor.authorLowe, Albyn
dc.contributor.authorSatija, Aman
dc.contributor.authorMasri, Assaad R.
dc.contributor.authorLucht, Robert P.
dc.date.accessioned2022-06-06T08:15:40Z
dc.date.available2022-06-06T08:15:40Z
dc.date.issued2019-01-22
dc.identifier.citationThomas, L. M., Lowe, A., Satija, A., Masri, A. R., & Lucht, R. P. (2019). Five kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis. Combustion and Flame, 200, 405–416. doi:10.1016/j.combustflame.2018.11.004
dc.identifier.issn1556-2921
dc.identifier.issn0010-2180
dc.identifier.doi10.1016/j.combustflame.2018.11.004
dc.identifier.urihttp://hdl.handle.net/10754/678659
dc.description.abstractWe 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 (SYNSBURNTM) 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.
dc.description.sponsorshipFunding for this research program was provided by the U.S. Department of Energy, Division of Chemical Sciences, Geosciences and Biosciences, Grant no. (DE-FG02-03ER15391) and by the King Abdullah University of Science and Technology, CCF subaward (No. 1975-01). The University of Sydney Combustion Group is funded by the Australian Research Council, Grant no. ARC-DP180104190.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0010218018304796
dc.subjectLaser diagnostics
dc.subjectCoherent anti-Stokes Raman scattering
dc.subjectUltrafast spectroscopy
dc.subjectSpray flames
dc.subjectTurbulent combustion
dc.titleFive kHz thermometry in turbulent spray flames using chirped-probe pulse femtosecond CARS, part I: Processing and interference analysis
dc.typeArticle
dc.identifier.journalCOMBUSTION AND FLAME
dc.identifier.wosutWOS:000458089500036
dc.contributor.institutionSchool of Mechanical Engineering, Purdue University, West Lafayette, IN, 47906, United States
dc.contributor.institutionSchool of Aerospace Mechanical and Mechatronic Engineering, University of Sydney, NSW, 2006, Australia
dc.identifier.volume200
dc.identifier.pages405-416
kaust.grant.number1975-01
dc.identifier.eid2-s2.0-85056865399
kaust.acknowledged.supportUnitCCF subaward


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