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The breakdown of self-similarity in electrified counterflow diffusion flames

机译：电气化反流扩散火焰中自相似性的分解

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摘要

This work addresses the question of the validity of self-similar formulations in describing the structures of methane/air laminar counterflow diffusion flames subjected to incident sub-breakdown DC electric fields. The electric field is induced by two flat porous electrodes located on the oxidizer and fuel sides of the burner and arranged parallel to the mixing layer. Both experiments and numerical simulations of this configuration in recent work suggest the presence of a strong coupling effect between the aerothermo-chemical and electric fields whereby the velocity field is significantly modified by the momentum carried by a bi-directional ionic wind directed axially outwards from the diffusion flame. However, as shown in this study, such strong coupling is incompatible with standard self-similar formulations of the problem. An a-priori analysis of the steady axisymmetric numerical simulations results in Di Renzo et al. (2018) [1], which employ multi-component transport and detailed chemical kinetics, is presented in this study in order to address the suitability of self-similar descriptions in the present configuration. It is shown that, while self-similarity is preserved in unelectrified conditions along radial distances similar to one orifice radius, it breaks down profusely in electrified conditions as the applied voltage increases and nears saturation conditions, where the electric force field becomes two-dimensional and non-conservative in the close vicinity of the burner axis. As a result, for the purposes of self-similarity, increasing electrification counteracts the slenderness of the counterflow burner and decreases its effective aspect ratio. Counter-flow burners should therefore be extra slender if preservation of self-similar conditions is sought under incident electric fields. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：这项工作解决了自相似配方的有效性的问题，用于描述经受入射子击穿直流电场的甲烷/空气层压逆向扩散火焰的结构。电场由位于氧化剂上的两个平坦的多孔电极诱导，燃烧器的燃料侧并平行于混合层布置。在最近的工作中的这种配置的实验和数值模拟表明，通过由轴向向外的双向离子风携带的动量显着地修改了飞行场和电场之间的存在强烈的耦合效果。扩散火焰。然而，如本研究所示，这种强耦合与问题的标准自相似配方不相容。 DI Renzo等人的稳定轴对称数值模拟的A-priori分析。 （2018）[1]在本研究中介绍了使用多组分运输和详细化学动力学，以解决本配置中自相似描述的适用性。结果表明，虽然沿着类似于一个孔径半径的径向距离在偏差的径向距离中保留自相似度，但在电气化的电压增加和接近饱和条件下，它在电气化条件下分解，而电力场变为二维和近距离在燃烧器轴附近的非保守。结果，出于自相似性的目的，增加电气化抵消了逆流燃烧器的纤细性并降低了其有效纵横比。因此，如果在入射式电场中寻求保护自相似条件，则应额外纤细。 （c）2019燃烧研究所。由elsevier Inc.出版的所有权利保留。

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  • 来源
    《Combustion and Flame》 |2019年第7期|231-240|共10页
  • 作者

    Di Renzo Mario; Pascazio Giuseppe; Urzay Javier;

  • 作者单位

    Stanford Univ Ctr Turbulence Res Stanford CA 94305 USA|Politecn Bari Dipartimento Meccan Matemat & Management I-70125 Bari Italy|Politecn Bari Ctr Eccellenza Meccan Computaz I-70125 Bari Italy;

    Politecn Bari Dipartimento Meccan Matemat & Management I-70125 Bari Italy|Politecn Bari Ctr Eccellenza Meccan Computaz I-70125 Bari Italy;

    Stanford Univ Ctr Turbulence Res Stanford CA 94305 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Diffusion flames; Counterflow burners; Electric-fields; Ionic wind;

    机译：扩散火焰;逆流燃烧器;电场;离子风;

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