Large Eddy Simulation on the Effects of Pressure on Syngas/Air Turbulent Nonpremixed Jet Flames
AuthorsCiottoli, Pietro P.
Lee, Bok Jik
Lapenna, Pasquale E.
Malpica Galassi, Riccardo
Hernandez Perez, Francisco
Im, Hong G.
KAUST DepartmentClean Combustion Research Center
Computational Reacting Flow Laboratory (CRFL)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number1975-03 CCF
Embargo End Date2020-06-24
Permanent link to this recordhttp://hdl.handle.net/10754/656145
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AbstractThe influence of increasing pressure on nonpremixed syngas/air turbulent jet flames is numerically investigated using large eddy simulations in conjunction with a steady laminar flamelet approach. The applicability of the steady flamelet approach is assessed through an extensive parametric study of laminar counterflow flames and tangential stretching rate analysis on target flame structures at different pressures. Two sets of large eddy simulations, exploring pressure values up to 10 atm, are carried out. The first one (series A) is characterized by a constant jet Reynolds number, while the second one (series B) is characterized by a constant jet inlet velocity. Both campaigns show narrower flame brushes and reduced radical concentrations with increasing pressure. While for series A the flame length is not sensitive to pressure, a longer flame brush is noticed for series B, being mainly caused by the increased mass flow rate. The sensitivity of the local flame behavior to pressure, such as the OH layer thickness and position, is compared to the available experimental results, showing similar trends with a satisfactory agreement.
SponsorsThis work was supported by the National Research Foundation of Korea [2013R1A5A1073861, 2017R1A2B4003327]; KAUST [1975-03 CCF Subaward Agreement].
PublisherInforma UK Limited