Numerical modeling of momentum, heat transfer and combustion mechanisms of non-premixed swirling flame movement inside a cylindrical combustor

Abstract

This study presents a numerical investigation of momentum, heat transfer, and combustion mechanisms of non-premixed swirling flame movement of a cylindrical combustion chamber. Fluent, a commercial CFD software, has been used in calculations. Combinations created with different turbulence models, combustion models and reaction mechanisms have been compared with experimental results. Realizable k-epsilon and FR/EDM-4 step combination have increased capacity to predict reacting flow, resulting in better accuracy. FR/EDM-4 step has provided much more reliable results than other scenarios, especially the Flamelet model used with a detailed chemical mechanism. In addition, the effect of radiation heat transfer on the temperature field has been investigated. Considering radiation heat transfer causes an increase in heat transfer from the combustion chamber, which provides desired agreement with experimental results. Finally, the effects of different Schmidt numbers on temperature and velocity fields have been investigated. Schmidt number has not caused significant changes in the velocity field. Also, as the Schmidt number increases, it has been observed that the flame temperatures decrease to a certain extent in the combustion chamber.

Keywords

• Combustion modeling
• Turbulence
• Non-premixed flames
• Combustion engineering
• Radiation heat transfer

Kaynakça

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