Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances

C. F. Malleiy, Stefan Thynell

Research output: Contribution to conferencePaper

Abstract

Line-of-sight variations of temperature and concentrations of IR-active species within a simulated high-pressure flame are deduced using an inverse analysis. In this work, synthetic spectral transmittances, acquired by a Fourier transform infrared spectrometer along a single Line-of-sight, represent the experimental data. The theoretical basis of the inverse analysis is that spectral variations in the absorption coefficient contain information about spatial variations in temperature and species concentrations. An iterative approach based on the Marquardt- Levenberg method is utilized to solve for the temperature and species concentrations of CO and H2O. The results show that accurate spatial variations of temperature and species concentrations can be recovered when changes in the spectral transmittances caused by noise are smaller than those changes caused by spatial variations in temperature and species concentrations. The recovered centerline temperatures and species concentrations are, respectively, within 5% and 20% of the actual values, when the variations in spectral transmittance caused by noise are about the same as that caused by spatial variations in temperature and species concentrations. As the flame temperature increases, the inverse analysis becomes more sensitive to the effect of noise.

Original languageEnglish (US)
StatePublished - Jan 1 1997
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997

Other

Other35th Aerospace Sciences Meeting and Exhibit, 1997
CountryUnited States
CityReno
Period1/6/971/9/97

Fingerprint

inverse analysis
transmittance
temperature profiles
line of sight
profiles
spatial variation
temperature
Temperature
flame temperature
infrared spectrometers
Infrared spectrometers
absorption coefficient
flames
absorptivity
Fourier transform
Fourier transforms
spectrometer

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Malleiy, C. F., & Thynell, S. (1997). Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.
Malleiy, C. F. ; Thynell, Stefan. / Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.
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abstract = "Line-of-sight variations of temperature and concentrations of IR-active species within a simulated high-pressure flame are deduced using an inverse analysis. In this work, synthetic spectral transmittances, acquired by a Fourier transform infrared spectrometer along a single Line-of-sight, represent the experimental data. The theoretical basis of the inverse analysis is that spectral variations in the absorption coefficient contain information about spatial variations in temperature and species concentrations. An iterative approach based on the Marquardt- Levenberg method is utilized to solve for the temperature and species concentrations of CO and H2O. The results show that accurate spatial variations of temperature and species concentrations can be recovered when changes in the spectral transmittances caused by noise are smaller than those changes caused by spatial variations in temperature and species concentrations. The recovered centerline temperatures and species concentrations are, respectively, within 5{\%} and 20{\%} of the actual values, when the variations in spectral transmittance caused by noise are about the same as that caused by spatial variations in temperature and species concentrations. As the flame temperature increases, the inverse analysis becomes more sensitive to the effect of noise.",
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Malleiy, CF & Thynell, S 1997, 'Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances' Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States, 1/6/97 - 1/9/97, .

Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances. / Malleiy, C. F.; Thynell, Stefan.

1997. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances

AU - Malleiy, C. F.

AU - Thynell, Stefan

PY - 1997/1/1

Y1 - 1997/1/1

N2 - Line-of-sight variations of temperature and concentrations of IR-active species within a simulated high-pressure flame are deduced using an inverse analysis. In this work, synthetic spectral transmittances, acquired by a Fourier transform infrared spectrometer along a single Line-of-sight, represent the experimental data. The theoretical basis of the inverse analysis is that spectral variations in the absorption coefficient contain information about spatial variations in temperature and species concentrations. An iterative approach based on the Marquardt- Levenberg method is utilized to solve for the temperature and species concentrations of CO and H2O. The results show that accurate spatial variations of temperature and species concentrations can be recovered when changes in the spectral transmittances caused by noise are smaller than those changes caused by spatial variations in temperature and species concentrations. The recovered centerline temperatures and species concentrations are, respectively, within 5% and 20% of the actual values, when the variations in spectral transmittance caused by noise are about the same as that caused by spatial variations in temperature and species concentrations. As the flame temperature increases, the inverse analysis becomes more sensitive to the effect of noise.

AB - Line-of-sight variations of temperature and concentrations of IR-active species within a simulated high-pressure flame are deduced using an inverse analysis. In this work, synthetic spectral transmittances, acquired by a Fourier transform infrared spectrometer along a single Line-of-sight, represent the experimental data. The theoretical basis of the inverse analysis is that spectral variations in the absorption coefficient contain information about spatial variations in temperature and species concentrations. An iterative approach based on the Marquardt- Levenberg method is utilized to solve for the temperature and species concentrations of CO and H2O. The results show that accurate spatial variations of temperature and species concentrations can be recovered when changes in the spectral transmittances caused by noise are smaller than those changes caused by spatial variations in temperature and species concentrations. The recovered centerline temperatures and species concentrations are, respectively, within 5% and 20% of the actual values, when the variations in spectral transmittance caused by noise are about the same as that caused by spatial variations in temperature and species concentrations. As the flame temperature increases, the inverse analysis becomes more sensitive to the effect of noise.

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Malleiy CF, Thynell S. Line-of-sight temperature and species profiles from an inverse analysis of spectral transmittances. 1997. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.