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

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Published
  • K.K.J. Ranga Dinesh
  • J. A. van Oijen
  • K. H. Luo
  • Xi Jiang
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<mark>Journal publication date</mark>15/08/2014
<mark>Journal</mark>Fuel
Volume130
Number of pages8
Pages (from-to)189–196
Publication StatusPublished
<mark>Original language</mark>English

Abstract

An investigation of the local flame extinction of H2/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 H2/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.