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Near-field local flame extinction of oxy-syngas non-premixed jet flames: A DNS study

机译:含氧合成气非预混喷射火焰的近场局部熄灭:DNS研究

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摘要

An investigation of the local flame extinction of H_2/CO oxy-syngas and syngas-air nonpremixed jet flames was carried out using three-dimensional direct numerical simulations (DNS) with detailed chemistry by using flamelet generated manifold chemistry (FGM). The work has two main objectives: identify the influence of the Reynolds number on the oxy-syngas flame structure, and to clarify the local flame extinction of oxy-syngas and syngas-air flames at a higher Reynolds number. Two oxy-syngas flames at Reynolds numbers 3000 and 6000 and one syngas-air flame at Reynolds number 6000 were simulated. The scattered data, probability density function distributions and fully burning probability provide the local flame characteristics of oxy-syngas and syngas-air nonpremixed jet flames. It is found that the H_2/CO oxy-syngas flame burns well compared to the syngas-air flame and the high Reynolds number causes more flow straining, resulting in higher scalar dissipation rates which lead to lower temperatures and eventually local flame extinction. The oxy-syngas flames burns more vigorously than the syngas-air flame with the same adiabatic flame temperature of approximately 2400 K.
机译:使用三维火焰直接数值模拟(DNS),使用小火焰产生的歧管化学(FGM),通过详细的化学反应,研究了H_2 / CO氧气-合成气和合成气-空气非预混喷射火焰的局部熄灭。这项工作有两个主要目标:确定雷诺数对氧合成气火焰结构的影响,并阐明雷诺数较高时氧合成气和合成气空气火焰的局部熄灭。模拟了雷诺数为3000和6000的两个氧气合成气火焰和雷诺数为6000的一个合成气-空气火焰。分散的数据,概率密度函数分布和完全燃烧的概率提供了氧气-合成气和合成气-空气非预混喷射火焰的局部火焰特性。发现与合成气-空气火焰相比,H_2 / CO氧气-合成气火焰燃烧良好,并且高雷诺数导致更大的流动应变,从而导致更高的标量耗散率,从而导致更低的温度并最终局部熄灭。在相同的绝热火焰温度约为2400 K的情况下,含氧合成气火焰比合成气-空气火焰燃烧更剧烈。

著录项

  • 来源
    《Fuel》 |2014年第15期|189-196|共8页
  • 作者单位

    Energy Technology Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;

    Combustion Technology, Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands;

    Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK,Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Engineering Department, Lancaster University, Lancaster, Lancashire LA1 4YR, UK;

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

    DNS; Oxy-syngas flame; Syngas-air flame; Probability density functions; Fully burning probability;

    机译:DNS;氧气合成气火焰;合成气-空气火焰;概率密度函数;完全燃烧的可能性;

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