Influence of Swirl Number on Semi-Confined Flames

Abstract

Stoichiometric methane air swirling flame has been modelled using RANS equations and a simplified mechanisms of reaction. The reaction zone is strongly affected by the swirl intensity. The higher the swirl number is, the narrower the reaction zone is. The thermodynamic state of reaction products matches well that of equilibrium state at constant pressure.

Keywords

• CFD,RANS; Swirl; Flame; Methane

Original Research Paper

Abstract

References

1. Law C. K. Combustion Physics Cambridge. 2006
2. Chung T. J. "Computational Fluid Dynamics" Cambridge. 2006
3. Mira Martinez D., Cluff D.L., Jiang X., Numerical investigation of the burning characteristics of ventilation air methane in a combustion based mitigation system, Fuel Vol. 133 (2014) pp. 182–193 dx.doi.org/10.1016/j.fuel.2014.05.022
4. Chen Z., Ruan S., Swaminathan N. Simulation of turbulent lifted methane jet flames: Effects of air-dilution and transient flame propagation Combustion and Flame Vol. 162 (2015) pp. 703–716 dx.doi.org/10.1016/j.combustflame.2014.09.010
5. Ghasemi E., Soleimani S., Lin C.X. RANS simulation of methane-air burner using local extinction approach within eddy dissipation concept by OpenFOAM International Communications in Heat and Mass Transfer Vol 54 (2014) pp. 96–102 dx.doi.org/10.1016/j.icheatmasstransfer.2014.03.006
6. Parra T., Vuorinen V., Perez R., Szasz R. and Castro F.. Aerodynamic characterization of isothermal swirling flows in combustors. International Journal of Energy and Environmental Engineering (2014) 5:85.
7. Parra T., Perez R., Vuorinen V., Rodriguez M.A., Castro F. Flow features of confined swirling jets International Journal of Automotive Engineering and Technologies Vol. 4, Issue 1, 2015 pp. 12 – 15,
8. Roback R., Johnson B.V.. Mass and momentum turbulent transport experiments with confined swirling coaxial jets, NASA CR-168252, 1983

9. Kuo K. K. Principles of Combustion. Wiley Interscience. 1986
10. http://www.grc.nasa.gov/WWW/CEAWeb/ (visited 3.3.2015)