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首页> 外文期刊>Combustion and Flame >Experimental and soot modeling studies of ethylene counterflow diffusion flames: Non-monotonic influence of the oxidizer composition on soot formation
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Experimental and soot modeling studies of ethylene counterflow diffusion flames: Non-monotonic influence of the oxidizer composition on soot formation

机译：乙烯逆流扩散火焰的实验和烟尘模型研究：氧化剂成分对烟尘形成的非单调影响

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摘要

Previous soot studies in counterflow diffusion flames revealed that the sooting limit curve in regions with large oxygen mole fractions (X-O) exhibited marked bending behaviors that indicated a non-monotonic variation of sooting tendency with oxygen concentration. The underlying mechanisms of this bending behavior remained unclear. In this regard, the present study systematically investigated the effect of oxygen mole fraction in the oxidizer stream on the sooting characteristics of ethylene counterflow diffusion flames. We used the near-infrared light extinction technique to measure soot volume fractions of two types of flames that significantly differed in sooting structures: soot formation oxidation (SFO) flames with a fixed fuel mole fraction (X-F) of 0.28 and varying X-O between 0.5 and 1.0 and soot formation (SF) flames with pure ethylene (X-F = 1.0) in the fuel stream and varied X-O from 0.25 to 0.3. We also conducted detailed soot modeling studies by combining the gas-phase chemistry with a sectional soot model that accounted for soot inception, surface growth, particle coagulation as well as soot oxidation. Our experimental and modeling results demonstrated the non-monotonic relationship between soot volume fractions and X-O in SFO flames. A detailed analysis of the evolutionary process of soot formation revealed that the suppression of soot inception and the enhancement of the soot oxidation process with increasing X-O led to a reduction of soot volume fraction. On the contrary, the surface growth rates increased with X-O, resulting in an increase in soot mass concentration. These competing effects led to the non-monotonic variation of soot volume fractions with X-O in SFO flames. On the other hand, in SF flames both the inception and surface growth of soot increased as X-O increased, resulting in the observed monotonic relationship between soot volume fraction and X-O. We also analyzed the soot zone structures and made comparisons between SFO and SF flames. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：以前在逆流扩散火焰中进行的烟灰研究表明，在具有较大氧气摩尔分数（X-O）的区域中，烟灰极限曲线表现出明显的弯曲行为，表明烟灰趋势随氧气浓度呈非单调变化。这种弯曲行为的潜在机制仍不清楚。在这方面，本研究系统地研究了氧化剂物流中的氧气摩尔分数对乙烯逆流扩散火焰的烟ot特性的影响。我们使用近红外消光技术测量了两种在烟灰结构上存在显着差异的火焰的烟灰体积分数：烟灰形成氧化（SFO）火焰，其固定的燃料摩尔分数（XF）为0.28，XO在0.5至0.5之间变化。 1.0和烟灰形成（SF）在燃料流中用纯乙烯（XF = 1.0）燃烧，XO从0.25变为0.3。我们还通过将气相化学方法与截面烟灰模型相结合进行了详细的烟灰模型研究，该模型解释了烟灰开始，表面生长，颗粒凝结以及烟灰氧化。我们的实验和建模结果证明了SFO火焰中烟灰体积分数与X-O之间的非单调关系。对烟灰形成演变过程的详细分析显示，随着X-O的增加，烟灰开始抑制和烟灰氧化过程的增强导致烟灰体积分数的减少。相反，表面生长速率随X-O的增加而增加，导致烟灰质量浓度增加。这些竞争效应导致SFO火焰中X-O的烟灰体积分数非单调变化。另一方面，在SF火焰中，烟灰的开始和表面生长都随X-O的增加而增加，导致在烟灰体积分数和X-O之间观察到单调关系。我们还分析了烟尘区的结构，并比较了SFO和SF火焰。 （C）2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2018年第11期|304-318|共15页
  • 作者

    Xu Lei; Yan Fuwu; Zhou Mengxiang; Wang Yu; Chung Suk Ho;

  • 作者单位

    Wuhan Univ Technol, Sch Automot Engn, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Hubei, Peoples R China|Hubei Collaborat Innovat Ctr Automot Components T, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Automot Engn, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Hubei, Peoples R China|Hubei Collaborat Innovat Ctr Automot Components T, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Automot Engn, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Hubei, Peoples R China|Hubei Collaborat Innovat Ctr Automot Components T, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Automot Engn, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Hubei, Peoples R China|Hubei Collaborat Innovat Ctr Automot Components T, Wuhan 430070, Hubei, Peoples R China;

    KAUST, Clean Combust Res Ctr, Thuwal, Saudi Arabia;

  • 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

    Sooting structures; Counterflow diffusion flame; Oxygen concentration; Sectional method;

    机译：烟灰结构逆流扩散火焰氧浓度分法;

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