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Direct numerical simulations of turbulent non-premixed methane-air flames modeled with reduced kinetics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mahalingam, S. Chen, J. H. Day, M. Card, J. M. |
| Copyright Year | 1994 |
| Description | Turbulent non-premixed stoichiometric methane-air flames modeled with reduced kinetics have been studied using the direct numerical simulation approach. The simulations include realistic chemical kinetics, and the molecular transport is modeled with constant Lewis numbers for individual species. The effect of turbulence on the internal flame structure and extinction characteristics of methane-air flames is evaluated. Consistent with earlier DNS with simple one-step chemistry, the flame is wrinkled and in some regions extinguished by the turbulence, while the turbulence is weakened in the vicinity of the flame due to a combination of dilatation and an increase in kinematic viscosity. Unlike previous results, reignition is observed in the present simulations. Lewis number effects are important in determining the local stoichiometry of the flame. The results presented in this work are preliminary but demonstrate the feasibility of incorporating reduced kinetics for the oxidation of methane with direct numerical simulations of homogeneous turbulence to evaluate the limitations of various levels of reduction in the kinetics and to address the formation of thermal and prompt NO(x). |
| File Size | 641740 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950014621 |
| Archival Resource Key | ark:/13960/t3nw4d01f |
| Language | English |
| Publisher Date | 1994-12-01 |
| Access Restriction | Open |
| Subject Keyword | Inorganic And Physical Chemistry Viscosity Methane Stoichiometry Lewis Numbers Turbulence Computational Fluid Dynamics Premixed Flames Combustion Products Air Turbulent Combustion Nitrous Oxides Reacting Flow Reaction Kinetics Flow Distribution Oxidation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
