| Autor: |
Michael C. Drake, Robert W. Pitz, Sanjay M. Correa, Marshall Lapp |
| Rok vydání: |
1985 |
| Předmět: |
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| Zdroj: |
Symposium (International) on Combustion. 20:1983-1990 |
| ISSN: |
0082-0784 |
| DOI: |
10.1016/s0082-0784(85)80698-6 |
| Popis: |
Nitric oxide formation from thermal and FBN sources is studied in a turbulent nonpremixed syngas flame using laser diagnostic techniques and turbulent combustion modeling. The well-characterized syngas flame (produced by a central jet of CO/H2/N2/CH4/NH3 fuel in a co-flowing air stream) is experimentally analyzed with laser velocimetry, pulsed Raman scattering and NO probe sampling. Data for the mean and rms fluctuations of axial velocity, temperature, major species concentrations, density and mixture fraction are presented, along with yields of nitric oxide from thermal and fuel-bound nitrogen sources. A turbulent combustion model based upon time-averaged Navier-Stokes equations with k-∈ turbulence closure gives results in reasonable agreement with experiment for axial velocity and mixture fraction. This model is based upon equilibrium chemistry with an assumed shape mixture fraction pdf. It overpredicts the average temperature by as much as 250 K and underpredicts the yield of thermal NOx by a factor of 3. A simplified kinetic mechanism involving the production and destruction of NO and NH2 successfully predicts the experimentally observed trends in NOx yield from NH3 added to the syngas fuel, although the yield of NOx from NH3 is overpredicted by about 50%. Most of the theory/data discrepancies may be a result of neglecting superequilibrium radical concentrations in the theory. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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