Numerical Study of the Direct Pressure Effect of Acoustic Waves in Planar Premixed Flames Articles uri icon

authors

  • SCHMIDT, H.
  • JIMENEZ SANCHEZ, MARIA DEL CARMEN

publication date

  • August 2010

start page

  • 1610

end page

  • 1619

issue

  • 8

volume

  • 157

international standard serial number (ISSN)

  • 0010-2180

electronic international standard serial number (EISSN)

  • 1556-2921

abstract

  • Recently the unsteady response of 1-D premixed flames to acoustic pressure waves for the range of frequencies below and above the inverse of the flame transit time was investigated experimentally using OH
    chemiluminescence Wangher (2008) [1].
    They compared the frequency dependence of the measured response to the
    prediction of an analytical model proposed by Clavin et al. (1990) [2], derived from the standard flame model (one-step Arrhenius kinetics) and to a similar model proposed by McIntosh (1991) [3].
    Discrepancies between the experimental results and the model led to the
    conclusion that the standard model does not provide an adequate
    description of the unsteady response of real flames and that it is
    necessary to investigate more realistic chemical models. Here we follow
    exactly this suggestion and perform numerical studies of the response of
    lean methane flames using different reaction mechanisms. We find that
    the global flame response obtained with both detailed chemistry (GRI3.0 [4]) and a reduced multi-step model by Peters (1996) [5]
    lies slightly above the predictions of the analytical model, but is
    close to experimental results. We additionally used an irreversible
    one-step Arrhenius reaction model and show the effect of the pressure
    dependence of the global reaction rate in the flame response. Our
    results suggest first that the current models have to be extended to
    capture the amplitude and phase results of the detailed mechanisms, and
    second that the correlation between the heat release and the measured OH∗ chemiluminescence should be studied deeper.