Planck Mean Absorption Coefficients of H2O, CO2, CO and NO for radiation numerical modeling in combusting flows

  • Maciej Chmielewski Warsaw University of Technology Institute of Heat Engineering
  • Marian Gieras Warsaw University of Technology Institute of Heat Engineering


TheWeighted-Sum-of-Gray-Gases Model (WSGGM), based on temperature dependent weighting factors, is an ecientmethod of determining the absorption coecients in numerical modeling of combusting flows. Weighting factors areobtained by polynomial fitting of experimental data for only two reagents (H2O and CO2) to the analytical equationfor emissivity. In this article the use of Planck Mean Absorption Coecients (PMAC) for H2O, CO2, CO and NOin combustion numerical modeling is proposed. The aim of the PMAC approach is to improve the initial solutionof temperature and species mass fraction profiles in numerical modeling of non-premixed methane combustion. Theproposed model is verified against the results of turbulent, non-premixed methane combustion experimental data. Theimplemented PMAC model represents the flue gas composition and temperature more accurately than the WSGGM.

Author Biographies

Maciej Chmielewski, Warsaw University of Technology Institute of Heat Engineering
Maciej Chmielewski was born in 1988 in Łódź, Poland. He graduated from Warsaw University of Technology (WUT) in 2012 with an MSc degree in Aviation Engineering. He is currently a PhD student at the Institute of Heat Engineering, WUT. He works for Engineering Design Center (Institute of Aviation & General Electric Company). His field of interests covers combustion chambers of turbine engines and numerical combustion modeling.
Marian Gieras, Warsaw University of Technology Institute of Heat Engineering
Marian Gieras professor at Warsaw University of Technology, Faculty of Power and Aeronautical Engineering. Degrees: PhD – 1987, DSc – 2006, Prof. – 2009, Warsaw University of Technology. His scientific specializations are Mechanics as well as Mechanical and Environmental Engineering. He has been member of the Polish Combustion Institute since 1994, and the Combustion Section of Thermodynamics and Combustion Committee of the Polish Academy of Sciences since 2008. Project manager and lead performer of several EU-granted projects.


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How to Cite
CHMIELEWSKI, Maciej; GIERAS, Marian. Planck Mean Absorption Coefficients of H2O, CO2, CO and NO for radiation numerical modeling in combusting flows. Journal of Power Technologies, [S.l.], v. 95, n. 2, p. 97--104, july 2015. ISSN 2083-4195. Available at: <>. Date accessed: 14 july 2024.
Combustion and Fuel Processing


radiation modeling; combustion; absorption coeficient; weighted sum of gray gases

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