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Rotational CARS thermometry and concentration measurements in ethane-nitrogen mixtures using Fourier analysis

Hosseinnia, Ali LU ; Nordström, Emil LU ; Fatehi, Hesameddin LU ; Bood, Joakim LU and Bengtsson, Per Erik LU (2018) In Journal of Raman Spectroscopy
Abstract

Rotational coherent anti-Stokes Raman scattering (CARS) is an established diagnostic technique for thermometry and species concentration measurements of di-atomics and tri-atomics in combustion processes; however, studies on hydrocarbon fuel molecules have been scarce. In this work, we have investigated the diagnostic potential for rotational CARS on ethane with emphasis on concentration measurements in mixtures with nitrogen. Rotational CARS spectra have periodic line structures, and because ethane and nitrogen spectra partially overlap, a novel Fourier analysis approach was developed and applied to facilitate evaluation of relative concentrations and temperatures. Instead of the standard procedure of spectral fitting using libraries... (More)

Rotational coherent anti-Stokes Raman scattering (CARS) is an established diagnostic technique for thermometry and species concentration measurements of di-atomics and tri-atomics in combustion processes; however, studies on hydrocarbon fuel molecules have been scarce. In this work, we have investigated the diagnostic potential for rotational CARS on ethane with emphasis on concentration measurements in mixtures with nitrogen. Rotational CARS spectra have periodic line structures, and because ethane and nitrogen spectra partially overlap, a novel Fourier analysis approach was developed and applied to facilitate evaluation of relative concentrations and temperatures. Instead of the standard procedure of spectral fitting using libraries of theoretically calculated spectra, the fitting was based on an experimental database of temperatures and relative ethane/nitrogen concentrations. The method was successfully demonstrated in an ethane diffusion flame where ethane, initially at room temperature, is heated downstream as well as mixed with increasing amounts of nitrogen. The evaluated temperatures and concentrations are in good agreement with computational fluid dynamic model simulations.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Concentration measurements, Ethane, Fourier analysis, Rotational CARS, Thermometry
in
Journal of Raman Spectroscopy
publisher
John Wiley & Sons
external identifiers
  • scopus:85042117262
ISSN
0377-0486
DOI
10.1002/jrs.5339
language
English
LU publication?
yes
id
45b40178-724b-4788-aa18-64a629aac8d7
date added to LUP
2018-03-07 10:32:28
date last changed
2018-05-29 09:31:44
@article{45b40178-724b-4788-aa18-64a629aac8d7,
  abstract     = {<p>Rotational coherent anti-Stokes Raman scattering (CARS) is an established diagnostic technique for thermometry and species concentration measurements of di-atomics and tri-atomics in combustion processes; however, studies on hydrocarbon fuel molecules have been scarce. In this work, we have investigated the diagnostic potential for rotational CARS on ethane with emphasis on concentration measurements in mixtures with nitrogen. Rotational CARS spectra have periodic line structures, and because ethane and nitrogen spectra partially overlap, a novel Fourier analysis approach was developed and applied to facilitate evaluation of relative concentrations and temperatures. Instead of the standard procedure of spectral fitting using libraries of theoretically calculated spectra, the fitting was based on an experimental database of temperatures and relative ethane/nitrogen concentrations. The method was successfully demonstrated in an ethane diffusion flame where ethane, initially at room temperature, is heated downstream as well as mixed with increasing amounts of nitrogen. The evaluated temperatures and concentrations are in good agreement with computational fluid dynamic model simulations.</p>},
  author       = {Hosseinnia, Ali and Nordström, Emil and Fatehi, Hesameddin and Bood, Joakim and Bengtsson, Per Erik},
  issn         = {0377-0486},
  keyword      = {Concentration measurements,Ethane,Fourier analysis,Rotational CARS,Thermometry},
  language     = {eng},
  month        = {02},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Raman Spectroscopy},
  title        = {Rotational CARS thermometry and concentration measurements in ethane-nitrogen mixtures using Fourier analysis},
  url          = {http://dx.doi.org/10.1002/jrs.5339},
  year         = {2018},
}