Author(s)

M. S. Boulahlib, M. Chekired, S. Boukebbab

Abstract

An experimental study of turbulence effects on combustion in an axisymetric turbulent jet in a piloted Bunsen burner is presented. The dynamic field of turbulent premixed methane-air flames in lean and stoichiometric conditions (? = 0.6-1.0) was obtained using Particle Image Velocimetry Technique (PIV). The results show that on the burner axis, the mean velocities increase along the flame front. The turbulent kinetic energy is constant in the first third of the inner structure of the flame in unburned side, and increases later in the lean flame front. For the isothermal flow, near the burner wall, the turbulent kinetic energy is essentially produced by the mean velocity gradient. For the reactive flow case, the results show an important dissipation of turbulent kinetic energy in the central region of the jet due to the dilatation of the hot gases and at the same time, an important production of turbulent kinetic energy in the region surrounding the main jet.

Keywords

experimental, premixed combustion, turbulence grid, dynamic field