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Chemical explosive mode analysis for a turbulent lifted ethylene jet flame in highly-heated coflow

机译:高温共流中湍流抬升的乙烯射流火焰的化学爆炸模式分析

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摘要

The recently developed method of chemical explosive mode (CEM) analysis (CEMA) was extended and employed to identify the detailed structure and stabilization mechanism of a turbulent lifted ethylene jet flame in heated coflowing air, obtained by a 3-D direct numerical simulation (DNS). It is shown that CEM is a critical feature in ignition as well as extinction phenomena, and as such the presence of a CEM can be utilized in general as a marker of explosive, or pre-ignition, mixtures. CEMA was first demonstrated in 0-D reactors including auto-ignition and perfectly stirred reactors, which are typical homogeneous ignition and extinction applications, respectively, and in 1-D premixed laminar flames of ethylene-air. It is then employed to analyze a 2-D spanwise slice extracted from the 3-D DNS data. The flame structure was clearly visualized with CEMA, while it is more difficult to discern from conventional computational diagnostic methods using individual species concentrations or temperature. Auto-ignition is identified as the dominant stabilization mechanism for the present turbulent lifted ethylene jet flame, and the contribution of dominant chemical species and reactions to the local CEM in different flame zones is quantified. A 22-species reduced mechanism with high accuracy for ethylene-air was developed from the detailed University of Southern California (USC) mechanism for the present simulation and analysis.
机译:扩展并扩展了最近开发的化学爆炸模式(CEM)分析方法(CEMA),该方法用于识别通过3D直接数值模拟(DNS)获得的湍流提升的乙烯射流火焰在加热的并流空气中的详细结构和稳定机制)。结果表明,CEM是着火以及熄灭现象的关键特征,因此,CEM的存在通常可以用作爆炸性或预点火混合物的标记。 CEMA最初在包括自燃式和完全搅拌式反应器在内的0维反应堆中进行了演示,这是典型的均质着火和熄灭应用,并且在乙烯-空气的1-D预混层流火焰中得到了证明。然后将其用于分析从3-D DNS数据中提取的2-D展向切片。使用CEMA可以清晰地看到火焰结构,而使用单个物质浓度或温度很难与常规计算诊断方法区分开。自燃被确定为当前湍流抬升的乙烯射流火焰的主要稳定机制,并且量化了主要化学物质和反应对不同火焰区域中局部CEM的贡献。从详细的南加州大学(USC)机构开发了22种用于乙烯空气的高精度还原机理,用于本模拟和分析。

著录项

  • 来源
    《Combustion and Flame》 |2012年第1期|p.265-274|共10页
  • 作者单位

    Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, USA;

    School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea;

    Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;

    Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;

    Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, N] 08544, USA;

    Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139, 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

    chemical explosive mode analysis; turbulent lifted flame; autoignition; direct numerical simulation; mechanism reduction;

    机译:化学爆炸模态分析湍流燃烧火焰自燃直接数值模拟机理降低;

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