Abstract
Line-by-line models based on spectroscopic databases are powerful tools
for the generation of accurate gas absorption spectra but still require
validation for high-temperature and high-pressure conditions. Therefore,
this study carried out spectral transmissivity measurements of CO2/N2 mixtures at temperatures of approximately 773 K and 1273 K and pressures between 1 bar and 60 bar. The measurement data was obtained in a spectral range from 1900 cm-1 to 6600 -1 cm at a spectral resolution of 1 cm -1and was compared with line-by-line predictions. The comparisons show that the absorption spectra of CO2
can be predicted for high-temperature and high-pressure conditions with
good accuracy if the line-by-line calculations are performed using
modified line profiles and the HITEMP-2010 database. In comparison with
standard line-shape functions, both the Voigt line-shape function
combined with the cut-off criterion of Alberti et al. (2015) and the
Price line-shape function modified with one of the two
corrections of Westlye et al. (2023, 2022) provided significantly
superior predictions. However, deficiencies of the cut-off criterion of
Alberti et al. become clear in the transmissivity predictions of the
right wings of the 4.3 µm band and the 2.7 µm band. The Price line-shape function combined with the first
correction of Westlye et al. was able to overcome these erroneous
predictions of the wings, while the Price line-shape function modified
with the second correction of Westlye et al. only proved superior for gas mixtures with 20% CO2 and 80% N2 (in mole fractions).
Original language | English |
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Article number | 109121 |
Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
Volume | 329 |
Number of pages | 21 |
ISSN | 0022-4073 |
DOIs | |
Publication status | Published - 2024 |
Keywords
- HITEMP-2010
- High pressure
- Measurements
- Radiative heat transfer
- Spectral transmissivity