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

Ranga Dinesh, K.K.J. and van Oijen, J. A. and Luo, K. H. and Jiang, Xi (2014) Near-field local flame extinction of oxy-syngas non-premixed jet flames:a DNS study. Fuel, 130. 189–196. ISSN 1873-7153

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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.

Item Type:
Journal Article
Journal or Publication Title:
Fuel
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2103
Subjects:
ID Code:
69366
Deposited By:
Deposited On:
06 May 2014 08:28
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Apr 2020 03:10