A computational fluid dynamics study of turbulence, radiation, and combustion models for natural gas combustion burner
This paper presents a Computational Fluid Dynamics (CFD) study of a natural gas combustion burner focusing on the effect of combustion, thermal radiation and turbulence models on the temperature and chemical species con-centration fields. The combustion was modelled using the finite rate/eddy dissip...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Department of Chemical Engineering, Diponegoro University
2018
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/21557/1/Pang%20BCREC%201395-5696-3-PB.pdf http://umpir.ump.edu.my/id/eprint/21557/ https://ejournal2.undip.ac.id/index.php/bcrec/article/view/1395/1290 |
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| Summary: | This paper presents a Computational Fluid Dynamics (CFD) study of a natural gas combustion burner focusing on the effect of combustion, thermal radiation and turbulence models on the temperature and chemical species con-centration fields. The combustion was modelled using the finite rate/eddy dissipation (FR/EDM) and partially pre-mixed flame models. Detailed chemistry kinetics CHEMKIN GRI-MECH 3.0 consisting of 325 reactions was em-ployed to model the methane combustion. Discrete ordinates (DO) and spherical harmonics (P1) model were em-ployed to predict the thermal radiation. The gas absorption coefficient dependence on the wavelength is resolved by the weighted-sum-of-gray-gases model (WSGGM). Turbulence flow was simulated using Reynolds-averaged Na-vier-Stokes (RANS) based models. The findings showed that a combination of partially premixed flame, P1 and standard k-ε (SKE) gave the most accurate prediction with an average deviation of around 7.8% of combustion temperature and 15.5% for reactant composition (methane and oxygen). The results show the multi-step chemistry in the partially premixed model is more accurate than the two-step FR/EDM. Meanwhile, inclusion of thermal ra-diation has a minor effect on the heat transfer and species concentration. SKE turbulence model yielded better prediction compared to the realizable k-ε (RKE) and renormalized k-ε (RNG). The CFD simulation presented in this work may serve as a useful tool to evaluate a performance of a natural gas combustor. |
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