An efficient finite-rate chemistry model for a preconditioned compressible flow solver and its comparison with the flamelet/progress-variable model

Suo Yang, Xingjian Wang, Hongfa Huo, Wenting Sun, Vigor Yang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

An efficient finite-rate chemistry (FRC) model is developed for a preconditioned compressible flow solver. The model uses a point-implicit stiff ODE solver and a correlated dynamic adaptive chemistry algorithm. With respect to the conventional FRC model using the double precision variable coefficient stiff ODE solver, the present work achieves an 8.6 times speed-up for chemistry calculation, and 6.4 times for total computation, when using a 20-species kinetics mechanism for methane/air flames. As an example problem, a piloted partially premixed methane/air jet flame (Sandia Flame D), with a relatively low level of local extinction and re-ignition, is considered, and both the new FRC-large eddy simulation (LES) and flamelet/progress-variable (FPV)-LES are conducted. The FRC-LES approach predicts larger time-averaged flame length, and better agrees with the measured value. This is because the instantaneous high-temperature zone for the FPV-LES case is significantly smaller than it's FRC-LES counterpart, especially in the downstream region. For spatial distribution of time-averaged statistics, the FPV-LES result agrees with the experimental data better. For conditional statistics in the mixture fraction space, the FRC-LES approach provides significantly better predictions. Near the stoichiometric region, in comparison with experimental data and the FRC-LES results, the FPV-LES approach predicts higher radical generation, but lower CO generation and heat release.

Original languageEnglish (US)
Pages (from-to)172-182
Number of pages11
JournalCombustion and Flame
Volume210
DOIs
StatePublished - Dec 2019
Externally publishedYes

Bibliographical note

Funding Information:
This work was funded partly by the Air Force Office of Scientific Research (Grant FA9550-18-1-0216 ), partly by NASA (Grant NNX15AU96A ), and partly by the William R.T. Oakes Endowment of the Georgia Institute of Technology .

Publisher Copyright:
© 2019 The Combustion Institute

Keywords

  • Finite-rate chemistry
  • Flamelet/progress-variable
  • Large eddy simulation
  • Turbulent combustion

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