Effect of turbulence–chemistry interactions on chemical pathways for turbulent hydrogen–air premixed flames

Dasgupta, Debolina; Sun, Wenting; Day, Marc; Lieuwen, Tim

doi:10.1016/j.combustflame.2016.09.029

Effect of turbulence–chemistry interactions on chemical pathways for turbulent hydrogen–air premixed flames

Journal Article · Fri Nov 11 04:00:00 EST 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.09.029· OSTI ID:1435076

^[1]; Sun, Wenting ^[1]; Day, Marc ^[2]; Lieuwen, Tim ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States). School of Aerospace Engineering
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Computational Sciences and Engineering

This paper considers the kinetic pathways of hydrogen oxidation in turbulent, premixed H₂ –air flames. It assesses the relative roles of different reaction steps in H₂ oxidation relative to laminar flames, and the degree to which turbulence–chemistry interactions alters the well understood oxidation pathway that exist in laminar flames. This is done by analyzing the turbulent, lean (Φ = 0.4), H₂ –air flame DNS database from Aspden et al. [17]. The relative roles of dominant reaction steps in heat release and radical formation/consumption are analyzed at different Karlovitz numbers and compared with laminar stretched flame calculations from counterflow flames and perfectly stirred reactors. It is found that both the progress variable conditioned and spatially integrated contributions of the dominant reactions remain qualitatively similar between a highly turbulent and a laminar unstretched flame. Larger changes, up to a factor of about two, occur in the relative roles of reactions with secondary influences on heat release and radical production/consumption. These results suggest that the kinetic routes through which H₂ is oxidized remain essentially constant between laminar, unstretched flames and high Karlovitz number flames.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1435076

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 176; ISSN 0010-2180

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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