Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames

V. Papapostolou; N. Chakraborty; Markus Klein; Hong G. Im

doi:10.1615/thmt-18.200

Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames

V. Papapostolou, N. Chakraborty, Markus Klein, Hong G. Im

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

The statistical behaviour of turbulent scalar flux (TSF) and modelling of its transport have been analysed for major species (H2,O2 and H2O) in the context of Reynolds-Averaged Navier Stokes simulations using a detailed chemistry Direct Numerical Simulation database of freely-propagating H2−air flames spanning the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) regimes of premixed turbulent combustion. The TSF in the CF and TRZ regimes exhibits counter-gradient transport, whilst gradient transport was found in the BRZ regime. The TSF transport equation terms' exhibited similar behaviour in the CF and TRZ regimes, but significantly differed in the BRZ regime. Similar behaviour for different terms in the TSF equation has been observed for the major reactants, while the major product shows an opposite sign. Based on a priori assessment of existing models it has been found that they perform reasonably well in the CF and TRZ regimes, but are inadequate for the BRZ regime.

Original language	English (US)
Title of host publication	Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
Publisher	Begell House
ISBN (Print)	9781567004687
DOIs	https://doi.org/10.1615/thmt-18.200
State	Published - 2018

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KAUST Repository Item: Exported on 2021-04-14

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Papapostolou, V., Chakraborty, N., Klein, M., & Im, H. G. (2018). Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames. In Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer Begell House. https://doi.org/10.1615/thmt-18.200

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abstract = "The statistical behaviour of turbulent scalar flux (TSF) and modelling of its transport have been analysed for major species (H2,O2 and H2O) in the context of Reynolds-Averaged Navier Stokes simulations using a detailed chemistry Direct Numerical Simulation database of freely-propagating H2−air flames spanning the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) regimes of premixed turbulent combustion. The TSF in the CF and TRZ regimes exhibits counter-gradient transport, whilst gradient transport was found in the BRZ regime. The TSF transport equation terms' exhibited similar behaviour in the CF and TRZ regimes, but significantly differed in the BRZ regime. Similar behaviour for different terms in the TSF equation has been observed for the major reactants, while the major product shows an opposite sign. Based on a priori assessment of existing models it has been found that they perform reasonably well in the CF and TRZ regimes, but are inadequate for the BRZ regime.",

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Papapostolou, V, Chakraborty, N, Klein, M & Im, HG 2018, Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames. in Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. Begell House. https://doi.org/10.1615/thmt-18.200

Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames. / Papapostolou, V.; Chakraborty, N.; Klein, Markus et al.
Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. Begell House, 2018.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N1 - KAUST Repository Item: Exported on 2021-04-14

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N2 - The statistical behaviour of turbulent scalar flux (TSF) and modelling of its transport have been analysed for major species (H2,O2 and H2O) in the context of Reynolds-Averaged Navier Stokes simulations using a detailed chemistry Direct Numerical Simulation database of freely-propagating H2−air flames spanning the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) regimes of premixed turbulent combustion. The TSF in the CF and TRZ regimes exhibits counter-gradient transport, whilst gradient transport was found in the BRZ regime. The TSF transport equation terms' exhibited similar behaviour in the CF and TRZ regimes, but significantly differed in the BRZ regime. Similar behaviour for different terms in the TSF equation has been observed for the major reactants, while the major product shows an opposite sign. Based on a priori assessment of existing models it has been found that they perform reasonably well in the CF and TRZ regimes, but are inadequate for the BRZ regime.

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Papapostolou V, Chakraborty N, Klein M, Im HG. Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames. In Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. Begell House. 2018 doi: 10.1615/thmt-18.200

Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames

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