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Mobility size and mass of nascent soot particles in a benchmark premixed ethylene flame

机译：基准预混乙烯火焰中新生烟灰颗粒的迁移率大小和质量

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摘要

The burner stabilized stagnation flame technique coupled with micro-orifice probe sampling and mobility sizing has evolved into a useful tool for examining the evolution of the particle size distribution of nascent soot in laminar premixed flames. Several key aspects of this technique are examined through a multiuniversity collaborative study that involves both experimental measurement and computational modeling. Key issues examined include (a) data reproducibility and facility effects using four burners of different sizes and makers over three different facilities, (b) the mobility diameter and particle mass relationship, and (c) the degree to which the finite orifice flow rate affects the validity of the boundary condition in a pseudo one dimensional stagnation flow flame formulation. The results indicate that different burners across facilities yield nearly identical results after special attention is paid to a range of experimental details, including a proper selection of the sample dilution ratio and quantification of the experimental flame boundary conditions. The mobility size and mass relationship probed by tandem mass and mobility measurement shows that nascent soot with mobility diameter as small as 15 nm can deviate drastically from the spherical shape. Various non-spherical morphology models using a mass density value of 1.5 g/cm(3) can reconcile this discrepancy in nascent soot mass. Lastly, two-dimensional axisymmetric simulations of the experimental flame with and without the sample orifice flow reveal several problems of the pseudo one-dimensional stagnation flow flame approximation. The impact of the orifice flow on the flame and soot sampled, although small, is not negligible. Specific suggestions are provided as to how to treat the non-ideality of the experimental setup in experiment and model comparisons. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：燃烧器稳定的停滞火焰技术，再加上微孔探针采样和迁移率定径，已发展成为一种有用的工具，可用于检查层状预混火焰中新生烟灰粒度分布的演变。通过一项涉及实验测量和计算建模的多大学合作研究，对该技术的几个关键方面进行了研究。审查的关键问题包括（a）在三个不同设施上使用四个不同尺寸和制造商的燃烧器的数据可再现性和设施效果，（b）迁移率直径和颗粒质量关系，以及（c）有限孔口流速影响的程度拟一维停滞流火焰公式中边界条件的有效性。结果表明，在特别注意一系列实验细节（包括适当选择样品稀释比和量化实验火焰边界条件）之后，设施中不同的燃烧器将产生几乎相同的结果。通过串联质量和迁移率测量探究的迁移率大小和质量关系显示，迁移率直径小至15 nm的新生烟灰可能会严重偏离球形。使用1.5 g / cm（3）的质量密度值的各种非球形形态模型可以解决这种初生烟灰质量的差异。最后，在有和没有样品孔流的情况下，实验火焰的二维轴对称模拟揭示了伪一维停滞流火焰逼近的几个问题。孔口流量对火焰和烟尘的影响虽然很小，但不可忽略。针对如何在实验和模型比较中处理实验装置的非理想性提供了具体建议。 （C）2015年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2015年第10期|3810-3822|共13页
  • 作者

    Camacho Joaquin; Liu Changran; Gu Chen; Lin He; Huang Zhen; Tang Quanxi; You Xiaoqing; Saggese Chiara; Li Yang; Jung Heejung; Deng Lei; Wlokas Irenaeus; Wang Hai;

  • 作者单位

    Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA;

    Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA;

    Shanghai Jiao Tong Univ, MOE, Key Lab Power Machinery & Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, MOE, Key Lab Power Machinery & Engn, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, MOE, Key Lab Power Machinery & Engn, Shanghai 200240, Peoples R China;

    Tsinghua Univ, Ctr Combust Energy, Beijing 100084, Peoples R China|Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Tsinghua Univ, Ctr Combust Energy, Beijing 100084, Peoples R China|Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;

    Politecn Milan, Dept Chem Mat & Chem Engn Giulio Natta, I-20133 Milan, Italy;

    Univ Calif Riverside, Coll Engn, Dept Mech Engn, Riverside, CA 92521 USA|Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol CE CERT, Riverside, CA 92521 USA;

    Univ Calif Riverside, Coll Engn, Dept Mech Engn, Riverside, CA 92521 USA|Univ Calif Riverside, Coll Engn, Ctr Environm Res & Technol CE CERT, Riverside, CA 92521 USA;

    Univ Duisburg Essen, Inst Combust & Gasdynam Fluid Dynam, D-47057 Duisburg, Germany;

    Univ Duisburg Essen, Inst Combust & Gasdynam Fluid Dynam, D-47057 Duisburg, Germany;

    Stanford Univ, Dept Mech Engn, 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

    Soot; Mobility sizing; Particle size distribution; Premixed flames;

    机译：烟灰;流动性;粒度分布;预混火焰;

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