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

作者：Dinesh K K J Ranga^*; van Oijen J A; Luo K H; Jiang X

来源：Fuel, 2014, 130: 189-196.

DOI：10.1016/j.fuel.2014.04.011

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

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. %26lt;br%26gt;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.

• 出版日期2014-8-15
• 单位清华大学