Details
Conference
| Conference | 10th U.S. National Combustion Meeting |
|---|---|
| Country/Territory | United States |
| City | College Park |
| Period | 23 Apr 2017 → 26 Apr 2017 |
Abstract
Microwave spectroscopy which probes the rotational transition of polar molecules in the gas-phase has been a proven technique for the detection and identification of short-lived molecules produced from a variety of molecular sources. In this work, the applicability of microwave spectroscopy for combustion diagnostics was tested. To this end, a home-built flat flame burner system was coupled to a coaxially oriented beam-resonator arrangement (COBRA) Fourier transform microwave spectrometer. Gases, i.e., reactants, intermediates, and products were sampled from low-pressure premixed flames and coupled into a molecular beam using a fast-mixing nozzle. Based on well-known rotational transitions, formaldehyde, ketene, acetaldehyde, and dimethyl ether were unambiguously identified and detected in fuel-rich flames of ethylene and dimethyl ether. Probing the flames at various positions, the relative abundance of these species was observed as function of distance to the burner surface, thus providing one-dimensional intensity profiles that can be compared to profiles obtained via other techniques (for example mass spectrometer or laser-based diagnostics). The current dwell time in the transfer line allowed only for stable species produced in the flame to be observed in the molecular beam. However, this combination of species source and detection shows promise for future work in observing previously undetected short-lived, combustion intermediates.
Keywords
- Flame-sampling, Low-pressure premixed flame, Microwave spectroscopy
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Engineering(all)
- Mechanical Engineering
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2017. 10th U.S. National Combustion Meeting, College Park, United States.
Research output: Contribution to conference › Slides to presentation › Research › peer review
}
TY - CONF
T1 - Fourier transform microwave spectroscopic studies of dimethyl ether and ethylene flames
AU - Hansen, N.
AU - Wullenkord, J.
AU - Obenchain, D. A.
AU - Kohse-Höinghaus, K.
AU - Grabow, J. U.
N1 - Funding Information: This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences. Sandia is a multi-mission laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the National Nuclear Security Administration under contract DE-AC04-94-AL85000. Publisher Copyright: © 2017 Eastern States Section of the Combustion Institute. All rights reserved. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2017/6/21
Y1 - 2017/6/21
N2 - Microwave spectroscopy which probes the rotational transition of polar molecules in the gas-phase has been a proven technique for the detection and identification of short-lived molecules produced from a variety of molecular sources. In this work, the applicability of microwave spectroscopy for combustion diagnostics was tested. To this end, a home-built flat flame burner system was coupled to a coaxially oriented beam-resonator arrangement (COBRA) Fourier transform microwave spectrometer. Gases, i.e., reactants, intermediates, and products were sampled from low-pressure premixed flames and coupled into a molecular beam using a fast-mixing nozzle. Based on well-known rotational transitions, formaldehyde, ketene, acetaldehyde, and dimethyl ether were unambiguously identified and detected in fuel-rich flames of ethylene and dimethyl ether. Probing the flames at various positions, the relative abundance of these species was observed as function of distance to the burner surface, thus providing one-dimensional intensity profiles that can be compared to profiles obtained via other techniques (for example mass spectrometer or laser-based diagnostics). The current dwell time in the transfer line allowed only for stable species produced in the flame to be observed in the molecular beam. However, this combination of species source and detection shows promise for future work in observing previously undetected short-lived, combustion intermediates.
AB - Microwave spectroscopy which probes the rotational transition of polar molecules in the gas-phase has been a proven technique for the detection and identification of short-lived molecules produced from a variety of molecular sources. In this work, the applicability of microwave spectroscopy for combustion diagnostics was tested. To this end, a home-built flat flame burner system was coupled to a coaxially oriented beam-resonator arrangement (COBRA) Fourier transform microwave spectrometer. Gases, i.e., reactants, intermediates, and products were sampled from low-pressure premixed flames and coupled into a molecular beam using a fast-mixing nozzle. Based on well-known rotational transitions, formaldehyde, ketene, acetaldehyde, and dimethyl ether were unambiguously identified and detected in fuel-rich flames of ethylene and dimethyl ether. Probing the flames at various positions, the relative abundance of these species was observed as function of distance to the burner surface, thus providing one-dimensional intensity profiles that can be compared to profiles obtained via other techniques (for example mass spectrometer or laser-based diagnostics). The current dwell time in the transfer line allowed only for stable species produced in the flame to be observed in the molecular beam. However, this combination of species source and detection shows promise for future work in observing previously undetected short-lived, combustion intermediates.
KW - Flame-sampling
KW - Low-pressure premixed flame
KW - Microwave spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85049113361&partnerID=8YFLogxK
U2 - 10.15278/isms.2017.WE10
DO - 10.15278/isms.2017.WE10
M3 - Slides to presentation
T2 - 10th U.S. National Combustion Meeting
Y2 - 23 April 2017 through 26 April 2017
ER -