Research Output
Algorithmic determination of the mechanism through which H2O-dilution affects autoignition dynamics and NO formation in CH4/air mixtures
  The Computational Singular Perturbation (CSP) algorithm is employed in order to determine how H2O-dilution influences ignition delay and chemical paths that generate NO during isochoric homogenous lean CH4/air autoignition. Regarding the ignition delay, it is shown that H2O-dilution enhances reactivity, mainly due to the increased OH production throughout the explosive stage via reaction H2O2 (+H2O) -> OH + OH(+H2O). With regard to NO generation, the relative importance of thermal and chemical effects are examined and it is concluded that both are important. The thermal effects result in a lower temperature at the end of the explosive stage, while the most notable chemical effect is the lower level of O after this stage, mainly due to the effect of H2O-dilution on the equilibrium of the reaction O + H2O OH + OH. The depletion of O, together with the thermal effect, causes a substantial decrease in final NO generation.

  • Type:

    Article

  • Date:

    18 June 2016

  • Publication Status:

    Published

  • Publisher

    Elsevier BV

  • DOI:

    10.1016/j.fuel.2016.06.057

  • Cross Ref:

    S0016236116305099

  • ISSN:

    0016-2361

  • Funders:

    King Abdullah University of Science and Technology

Citation

Tingas, E. A., Kyritsis, D. C., & Goussis, D. A. (2016). Algorithmic determination of the mechanism through which H2O-dilution affects autoignition dynamics and NO formation in CH4/air mixtures. Fuel, 183, 90-98. https://doi.org/10.1016/j.fuel.2016.06.057

Authors

Keywords

Autoignition; NO; Methane; Water dilution; CSP

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