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research-article

Line-by-line random-number database for Monte Carlo simulations of radiation in combustion system

[+] Author and Article Information
Tao Ren

Member of ASME, School of Engineering, University of California, Merced, Merced, California, 95343
tren@ucmerced.edu

Michael F. Modest

Life fellow of ASME, School of Engineering, University of California, Merced, Merced, California, 95343
mmodest@ucmerced.edu

1Corresponding author.

ASME doi:10.1115/1.4041803 History: Received July 23, 2018; Revised September 21, 2018

Abstract

With today's computational capabilities, it has become possible to conduct line-by-line accurate radiative heat transfer calculations in spectrally highly nongray combustion systems using the Monte Carlo method. In these calculations, wavenumbers carried by photon bundles must be determined in a statistically meaningful way. The wavenumbers for the emitting photons are found from a database, which tabulates wavenumber--random number relations for each species. In order to cover most conditions found in industrial practices, a database tabulating these relations for CO2, H2O, CO, CH4, C2H4 and soot is constructed to determine emission wavenumbers and absorption coefficients for mixtures at temperatures up to 3000 K and total pressures up to 80 bar. The accuracy of the database is tested by reconstructing absorption coefficient spectra from the tabulated database. One-dimensional test cases are used to validate the database against analytical LBL solutions. Sample calculations are also conducted for a luminous flame and a gas turbine combustion burner. The database is available from the author's website upon request at http://eng.ucmerced.edu/people/mmodest

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