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PREDICTION OF INTERACTIONS BETWEEN BURNERS IN MULTI-BURNER SYSTEMS

S Kucukgokoglan
School of Mechanical, Materials, Manufacturing Engineering and Management University of Nottingham, Nottingham, NG7 2RD, UK

A. Aroussi
School of Mechanical, Materials, Manufacturing Engineering and Management University of Nottingham, Nottingham, NG7 2RD, UK, Malaysia Campus Jalan Broga, Samenyih 43500, Selangor Darul Ehsan, Malaysia

S. J. Pickering
School of Mechanical, Materials, Manufacturing Engineering and Management University of Nottingham, Nottingham, NG7 2RD, UK

M. Menacer
School of Mechanical, Materials, Manufacturing Engineering and Management, University of Nottingham, Nottingham NG7 2RD, United Kingdom

Abstrakt

Numerical predictions, made using Computational Fluid Dynamics (CFD), are presented describing the behavior of the performance of three different turbulence models for turbulent isothermal swirling flows, from multiple burners enclosed in furnace type geometry. The numerical models being used are: standard k-ε, RNG k-ε, and realisable k-ε. The realisable k-ε, model is a new model to be used in this type of application that needs to be compared with well-established models. The grid for the enclosed furnace-type geometry of the rig was created using the GAMBIT V.l.0.4 package, and the predictions from the CFD models have been obtained using the commercial CFD code FLUENT version 5.1

Predictions of four burners on a three-dimensional axisymmetric mesh show the near burner region is accurately predicted by increasing the mesh density. In full furnace simulations a fine mesh has been used within the near burner region to eliminate mesh dependency. This is because flame ignition generally occurs within one and a half burner diameters downstream of the exit with this type of burner design, and in this region a substantial amount of the total nitrous oxides emissions (NOx) is produced.

The standard k-ε and RNG k-ε are well established models in predicting turbulent isothermal swirling flows, which have been compared successfully to experimental results. Comprehensive comparisons of the three models show that good agreement is achieved with a high mesh resolution. In general, the velocity profiles, contours and flow patterns of the realizable k-ε, model are in general good agreement with the standard k-ε, RNG k-ε, models, indicating that the general flow-field within the furnace has been predicted accurately.

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