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Wide band correlated-k approaches for non-grey radiation modelling in oxy-fuel combustion with dry recycling

Ströhle, Jochen (2011):
Wide band correlated-k approaches for non-grey radiation modelling in oxy-fuel combustion with dry recycling.
In: Fuel, pp. 3007-3013, 90, (10), ISSN 00162361, DOI: 10.1016/j.fuel.2011.05.002, [Online-Edition: https://doi.org/10.1016/j.fuel.2011.05.002],
[Article]

Abstract

Increased CO2 and H2O concentrations in oxy-fuel combustion promote radiation compared to conventional air based technologies. Spectral radiation models are necessary to calculate the radiative properties of CO2 and H2O. In the present study, the wide band correlated-k method (WBCK) is evaluated for non-grey radiative transfer calculations in oxy-fuel combustion. Several WBCK formulations are presented and applied to virtual gas turbine combustors for both air and oxy-fuel combustion with dry recycling involving strongly varying H2O/CO2 ratios. The spectral formulation of the WBCK is the most exact approach, but leads to excessive computational times. The multiple gases formulation using three optimised absorption coefficient is found to be the optimum choice regarding accuracy and computational efficiency. The results of a standard weighted-sum-of-grey-gases method strongly deviate from those of the WBCK.

Item Type: Article
Erschienen: 2011
Creators: Ströhle, Jochen
Title: Wide band correlated-k approaches for non-grey radiation modelling in oxy-fuel combustion with dry recycling
Language: English
Abstract:

Increased CO2 and H2O concentrations in oxy-fuel combustion promote radiation compared to conventional air based technologies. Spectral radiation models are necessary to calculate the radiative properties of CO2 and H2O. In the present study, the wide band correlated-k method (WBCK) is evaluated for non-grey radiative transfer calculations in oxy-fuel combustion. Several WBCK formulations are presented and applied to virtual gas turbine combustors for both air and oxy-fuel combustion with dry recycling involving strongly varying H2O/CO2 ratios. The spectral formulation of the WBCK is the most exact approach, but leads to excessive computational times. The multiple gases formulation using three optimised absorption coefficient is found to be the optimum choice regarding accuracy and computational efficiency. The results of a standard weighted-sum-of-grey-gases method strongly deviate from those of the WBCK.

Journal or Publication Title: Fuel
Volume: 90
Number: 10
Uncontrolled Keywords: Radiative heat transfer, Spectral modelling, Wide band correlated-k method, Oxy-fuel combustion, Gas turbine combustor
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Energiesysteme und Energietechnik (EST)
Date Deposited: 08 Feb 2018 07:13
DOI: 10.1016/j.fuel.2011.05.002
Official URL: https://doi.org/10.1016/j.fuel.2011.05.002
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