Technique for Extrapolating Absorption Coefficient Measurements to High Temperatures.
Technique for Extrapolating Absorption Coefficient
Measurements to High Temperatures.
Wakatsuki, K.; Fuss, S. P.; Hamins, A.; Nyden, M. R.
Combustion Institute, Symposium (International) on
Combustion, 30th. Proceedings. Volume 30. Part 1.
July 25-30, 2004, Chicago, IL, Combustion Institute,
Pittsburgh, PA, Chen, J. H.; Colket, M. D.; Barlow, R.
S.; Yetter, R. A., Editor(s)(s), 1565-1573 pp, 2005.
Sponsor:National Institute of Standards and Technology,
combustion; high temperature; absorption; infrared
spectroscopy; high temperature; absorption coefficients;
extrapolation; equations; experiments; fuels; FT-IR;
carbon monoxide; carbon dioxide; water vapor; propane
An extrapolation technique that provides
semi-quantitative estimates for the infrared absorption
coefficients of gaseous fuels at temperatures beyond
those for which measurements are generally practical
(>700 K) is presented. The new method is based on a
simplified expression for molecular line intensities
consisting of three fitting parameters and two variables
(temperature and frequency). The accuracy of the
extrapolations was tested first by comparing predictions
of absorption coefficients for CO, CO2, and H2O vapor to
the corresponding values obtained directly from the
HITEMP molecular database. Finally, to establish the
practical utility of the method, the spectrum of propane
at 1000 K obtained from the extrapolation technique was
compared to actual experimental measurements.