4.7 Article

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

期刊

COMBUSTION AND FLAME
卷 162, 期 10, 页码 3810-3822

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2015.07.018

关键词

Soot; Mobility sizing; Particle size distribution; Premixed flames

资金

  1. Combustion Energy, Frontier Research Center (CEFRC), an Energy Frontier Research, Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001198]
  2. International Cooperation and Exchanges National Natural Science Foundation of China [51210010, 91441129]
  3. National Basic Research Program [2013CB228502]
  4. NSF [CBET1233038]
  5. state of North Rhine-Westphalia
  6. Politecnico di Milano

向作者/读者索取更多资源

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.

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