# Mixing and Combustion of Turbulent Coaxial Jets - An Application of Computational Fluid Dynamics to Swirling Flows

### Teresa Parra, Ruben Perez, Miguel Angel Rodriguez, Artur Gutkowski, Robert Szasz, Francisco Castro

#### Abstract

The aim of this research is gaining an insight into flow patterns in swirling burners. These are suitable for lean mixtures, because of procuring the fix position of the flame. The interaction of the two reactive confined swirling jets leads to the formation of complex patterns which are not well understood. In the present study, these flow patterns are numerically investigated using Reynolds Averaging Navier-Stokes (RANS) equations for the flow and a Probability Density Function is used for modelling the combustion. Two swirl numbers were characterised: 0.14 and 0.74. Strong swirling annular jets are responsible of an inner recirculation zone. Low swirling flows produce poorer mixture and wide flame fronts whereas strong swirling flows are precursors of mixing enhancement and thing flame fronts.

#### References

- García-Villalba M., Fröhlich J. and Rodi W. 2006a Identification and analysis of coherent structures in the near field of a turbulent unconfined annular swirling jet using large eddy simulation- Physics of Fluids (1994-present) 18:5, 055103
- García-Villalba M., and Fröhlich J. 2006b. LES of a free annular swirling jet-Dependence of coherent structures on a pilot jet and the level of swirl. International journal of heat and fluid flow 27:5, 911- 923
- Jones W., Whitelaw J., 1982. Calculation Methods for Reacting Turbulent Flows: A Review. Combustion and Flame vol. 48 pp1-26.
- Palm R., Grundmann S., Weismuller M., Saric S., Jakirlic S., Tropea C., 2006. Experimental characterization and modelling of inflow conditions for a gas turbine swirl combustor. International Journal of Heat and Fluid Flow 27 924-936.
- Parra T., Vuorinen V., Perez R., Szasz R. and Castro F. 2014. Aerodynamic characterization of isothermal swirling flows in combustors. International Journal of Energy and Environmental Engineering 5:85
- Parra-Santos M. T., Mendoza-Garcia V., Szasz R. Z., Gutkowski A. N., Castro-Ruiz F. 2015. Influence of swirling on the aero-thermodynamic behaviour of flames. Combustion Explosion and Shock Waves Accepted for publication on 23/5/14.
- Kuo K., 1986. Principles of Combustion. John Wiley and Sons.
- Roback R., Johnson B.V. 1983. Mass and momentum turbulent transport experiments with confined swirling coaxial jets, NASA CR-168252
- Versteeg H. K., Malalasekera W. 1995. Computational Fluid Dynamics, The finite volume method.

#### Paper Citation

#### in Harvard Style

Parra T., Perez R., Rodriguez M., Gutkowski A., Szasz R. and Castro F. (2014). **Mixing and Combustion of Turbulent Coaxial Jets - An Application of Computational Fluid Dynamics to Swirling Flows** . In *Proceedings of the 4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,* ISBN 978-989-758-038-3, pages 545-550. DOI: 10.5220/0005009005450550

#### in Bibtex Style

@conference{simultech14,

author={Teresa Parra and Ruben Perez and Miguel Angel Rodriguez and Artur Gutkowski and Robert Szasz and Francisco Castro},

title={Mixing and Combustion of Turbulent Coaxial Jets - An Application of Computational Fluid Dynamics to Swirling Flows},

booktitle={Proceedings of the 4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,},

year={2014},

pages={545-550},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0005009005450550},

isbn={978-989-758-038-3},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the 4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications - Volume 1: SIMULTECH,

TI - Mixing and Combustion of Turbulent Coaxial Jets - An Application of Computational Fluid Dynamics to Swirling Flows

SN - 978-989-758-038-3

AU - Parra T.

AU - Perez R.

AU - Rodriguez M.

AU - Gutkowski A.

AU - Szasz R.

AU - Castro F.

PY - 2014

SP - 545

EP - 550

DO - 10.5220/0005009005450550