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Research Papers: Radiative Heat Transfer

Improved Spectral Absorption Coefficient Grouping Strategies in Radiation Heat Transfer Calculations for H2O–CO2-Soot Mixtures

[+] Author and Article Information
Yue Zhou

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China

Qiang Wang

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China;
Collaborative Innovation Center for Advanced
Aero-Engines,
Beijing 100191, China

Haiyang Hu

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: 09451@buaa.edu.cn

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 18, 2017; final manuscript received July 28, 2017; published online October 17, 2017. Assoc. Editor: Zhixiong Guo.

J. Heat Transfer 140(3), 032702 (Oct 17, 2017) (12 pages) Paper No: HT-17-1030; doi: 10.1115/1.4038004 History: Received January 18, 2017; Revised July 28, 2017

In the present work, strategies for the grouping of the spectral absorption coefficients used in multiscale (MS) multigroup (MG) full-spectrum k-distribution models were improved by considering the effects of variations in both temperature and species molar ratio on the correlated-k characteristics of the spectra of H2O–CO2-soot mixtures. The improvements in the accuracy of predictions of radiation heat transfer characteristics resulting from these new grouping strategies were evaluated using a series of semi-one-dimensional (1D) cases with significant temperature, participating species molar ratio, and pressure inhomogeneities. Finally, evaluations of grouping strategies were presented on calculation of the full-spectrum thermal images of an actual aeroengine combustor.

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Figures

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Fig. 1

Radiation heat flux leaving the H2O–CO2-soot-N2 (left) and H2O–CO2–N2 (right) slabs with step changes in the species molar ratio

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Fig. 2

Radiation heat flux leaving the H2O–CO2-soot-N2 mixture slab with step changes in the temperature, species molar ratio, and pressure

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Fig. 3

Radiation heat flux leaving the H2O–CO2–N2 mixture slab with step changes in the temperature and species molar ratio

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Fig. 4

Radiation heat flux leaving the H2O–N2 mixture slab with step changes in the temperature and species molar ratio

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Fig. 5

Relative calculation errors of NBKD models with different band widths for case 9 (left) and case 11 (right)

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Fig. 6

Radiation heat flux leaving the H2O–CO2-soot-N2 (left) and H2O–CO2–N2 (right) slabs adjacent to hot black wall

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Fig. 7

Solid structure and calculation boundary conditions of the combustor in an air-breathing engine

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Fig. 8

Temperature (Left) and H2O mass fraction (right) distributions along the meridian plane of the combustor

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Fig. 9

The radiation transfer calculation mesh of the flame tube (top left) and the distributions of interpolated carbon dioxide mole fractions (top right), soot density (mg/m3, bottom left), and water vapor to carbon dioxide molar ratio (bottom right) along the meridian plane

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Fig. 10

Z-direction thermal image of the flame tube outlet as calculated by the LBL model (top) and calculation errors generated by the MSMGFSK-m model (bottom left) and MSMGFSK-s model (bottom right)

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