Differential Diffusion Effect in H2/NH3 Non-Premixed Flames and Flamelet-Based Models

DOI IR (HANDLE) Open Access
  • Ahmed Adam
    Interdisciplinary Graduate School of Engineering Sciences (IGSES), Kyushu University Mechanical Power Engineering Department, Faculty of Engineering, Helwan University
  • Watanabe Hiroaki
    Interdisciplinary Graduate School of Engineering Sciences (IGSES), Kyushu University

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Description

The primary focus of this work is to examine the differential diffusion effect for flames fueled by H_2/NH_3. For a non-premixed turbulent flame, two Direct Numerical Simulations (DNS) have been implemented in two-dimensional domain, one is considering the differential diffusion (DD) of each species pair and the other assumes Unity Lewis Number (ULN). Two Flamelet libraries are created based on ULN and Constant Lewis Number (CLN) assumptions, they are validated through priori tests based on the DNS results. Significant difference between the two DNS cases, the DD case is more resistible for quenching than ULN case, meaning ULN assumption for DNS is not suitable. Furthermore, significant variations in the chemistry states are also evident in ULN library results, suggesting that differential diffusion should be considered in the Flamelet model, additionally, equal diffusivities is inappropriate for an H_2/NH_3-fueled flame, while CLN library exhibits more consistent chemistry states with the DD DNS.

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Details 詳細情報について

  • CRID
    1390865265012119936
  • DOI
    10.5109/7323262
  • HANDLE
    2324/7323262
  • ISSN
    24341436
  • Text Lang
    en
  • Article Type
    conference paper
  • Data Source
    • JaLC
    • IRDB
    • Crossref
  • Abstract License Flag
    Allowed

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