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Title: Dual-resolution Raman spectroscopy for measurements of temperature and twelve species in hydrocarbon–air flames

Abstract

This study introduces dual-resolution Raman spectroscopy as a novel diagnostics approach for measurements of temperature and species in flames where multiple hydrocarbons are present. Simultaneous measurement of multiple hydrocarbons is challenging because their vibrational Raman spectra in the C–H stretch region are closely overlapped and are not well known over the range of temperature encountered in flames. Overlap between the hydrocarbon spectra is mitigated by adding a second spectrometer, with a higher dispersion grating, to collect the Raman spectra in the C–H stretch region. A dual-resolution Raman spectroscopy instrument has been developed and optimized for measurements of major species (N 2, O 2, H 2O, CO 2, CO, H 2, DME) and major combustion intermediates (CH 4, CH 2O, C 2H 2, C 2H 4 and C 2H 6) in DME–air flames. The temperature dependences of the hydrocarbon Raman spectra over fixed spectral regions have been determined through a series of measurements in laminar Bunsen-burner flames, and have been used to extend a library of previously acquired Raman spectra up to flame temperature. The paper presents the first Raman measurements of up to twelve species in hydrocarbon flames, and the first quantitative Raman measurements of formaldehyde in flames. Lastly, themore » accuracy and precision of the instrument are determined from measurements in laminar flames and the applicability of the instrument to turbulent DME–air flames is discussed.« less

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1345581
Report Number(s):
SAND2016-5927C
Journal ID: ISSN 1540-7489; 642386
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Journal Name: Proceedings of the Combustion Institute; Journal Volume: 36; Journal Issue: 3; Conference: Proposed for presentation at the 36th International Symposium on Combustion, Seoul (Korea), 31 Jul - 5 Aug 2016
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Magnotti, Gaetano, and Barlow, Robert S. Dual-resolution Raman spectroscopy for measurements of temperature and twelve species in hydrocarbon–air flames. United States: N. p., 2016. Web. doi:10.1016/j.proci.2016.06.128.
Magnotti, Gaetano, & Barlow, Robert S. Dual-resolution Raman spectroscopy for measurements of temperature and twelve species in hydrocarbon–air flames. United States. doi:10.1016/j.proci.2016.06.128.
Magnotti, Gaetano, and Barlow, Robert S. Tue . "Dual-resolution Raman spectroscopy for measurements of temperature and twelve species in hydrocarbon–air flames". United States. doi:10.1016/j.proci.2016.06.128.
@article{osti_1345581,
title = {Dual-resolution Raman spectroscopy for measurements of temperature and twelve species in hydrocarbon–air flames},
author = {Magnotti, Gaetano and Barlow, Robert S.},
abstractNote = {This study introduces dual-resolution Raman spectroscopy as a novel diagnostics approach for measurements of temperature and species in flames where multiple hydrocarbons are present. Simultaneous measurement of multiple hydrocarbons is challenging because their vibrational Raman spectra in the C–H stretch region are closely overlapped and are not well known over the range of temperature encountered in flames. Overlap between the hydrocarbon spectra is mitigated by adding a second spectrometer, with a higher dispersion grating, to collect the Raman spectra in the C–H stretch region. A dual-resolution Raman spectroscopy instrument has been developed and optimized for measurements of major species (N2, O2, H2O, CO2, CO, H2, DME) and major combustion intermediates (CH4, CH2O, C2H2, C2H4 and C2H6) in DME–air flames. The temperature dependences of the hydrocarbon Raman spectra over fixed spectral regions have been determined through a series of measurements in laminar Bunsen-burner flames, and have been used to extend a library of previously acquired Raman spectra up to flame temperature. The paper presents the first Raman measurements of up to twelve species in hydrocarbon flames, and the first quantitative Raman measurements of formaldehyde in flames. Lastly, the accuracy and precision of the instrument are determined from measurements in laminar flames and the applicability of the instrument to turbulent DME–air flames is discussed.},
doi = {10.1016/j.proci.2016.06.128},
journal = {Proceedings of the Combustion Institute},
number = 3,
volume = 36,
place = {United States},
year = {Tue Jul 12 00:00:00 EDT 2016},
month = {Tue Jul 12 00:00:00 EDT 2016}
}

Conference:
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