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Eulerian particle flamelet modeling for combustion processes of bluff-body stabilized methanol-air turbulent nonpremixed flames

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Abstract

The present study is focused on the development of the RIF (Representative Interactive Flamelet) model which can overcome the shortcomings of conventional approach based on the steady flamelet library. Due to the ability for interactively describing the transient behaviors of local flame structures with CFD solver, the RIF model can effectively account for the detailed mechanisms of NOx formation including thermal NO path, prompt and nitrous NOx formation, and reburning process by hydrocarbon radical without any ad-hoc procedure. The flamelet time of RIFs within a stationary turbulent flame may be thought to be Lagrangian flight time. In context with the RIF approach, this study adopts the Eulerian Particle Flamelet Model (EPFM) with mutiple flamelets which can realistically account for the spatial inhomogeneity of scalar dissipation rate. In order to systematically evaluate the capability of Eulerian particle flamelet model to predict the precise flame structure and NO formation in the multi-dimensional elliptic flames, two methanol bluffbody flames with two different injection velocities are chosen as the validation cases. Numerical results suggest that the present EPFM model has the predicative capability to realistically capture the essential features of flame structure and NOx formation in the bluff-body stabilized flames.

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Abbreviations

ap,k :

Planck mean absorption coefficient for radiating speciesk

Cp :

Specific heat of mixture at constant pressure

Di :

Diffusion coefficient of speciesi

d:

Fuel nozzle diameter

h, hk :

Enthalpy of mixture and speciesk

P:

Probability density function

Yi :

Mass fraction of speciesi

Z:

Mixture fraction

ρ:

Density

σb :

Stefan-Boltzmann constant

Wk :

Chemical production rate of speciesk

χ:

Scalar dissipation rate

st:

Stoichiometry

\(\bar \phi \) :

Reynolds-averaged (density-unweighted)

\(\bar \phi \) :

Favre-averaged (density-weighted)

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Authors and Affiliations

  1. Korea Aerospace Research Institute, Daejeon, Korea

    Seong-Ku Kim

  2. Department of Mechanical Engineering, Hanyang University, 17, Haengdang-Dong, Sungdong-Ku, 133-791, Seoul, Korea

    Sungmo Kang & Yongmo Kim

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  1. Seong-Ku Kim
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  2. Sungmo Kang
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  3. Yongmo Kim
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Correspondence to Yongmo Kim.

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Kim, SK., Kang, S. & Kim, Y. Eulerian particle flamelet modeling for combustion processes of bluff-body stabilized methanol-air turbulent nonpremixed flames. J Mech Sci Technol 20, 1459–1474 (2006). https://doi.org/10.1007/BF02915969

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  • DOI: https://doi.org/10.1007/BF02915969

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