Simultaneous measurements of temperature and soot volume fraction in turbulent diffusion flames

Abstract

Spatially resolved two-dimensional temperature and soot volume fractions were measured simultaneously in a turbulent non-premixed attached jet flame, using non-linear two-line atomic fluorescence (NTLAF) and laser induced incandescence (LII) techniques, respectively. Measurements were performed in a well characterised Ethylene-Hydrogen-Nitrogen jet flame in such a way as to avoid any significant interference of the two laser diagnostic techniques on each other. Laser ablation was used to seed Indium atoms into the flame for the temperature measurements. Sample images of single-shot simultaneous temperature and soot concentration images are presented at one location. Joint probability density functions (pdf’s) of soot volume fraction (SFV) as a function of temperature are also reported. The strong influence of temperature on SVF is found to be consistent with the current understanding and highlights the importance of the simultaneous measurements for understanding soot behaviour in a turbulent environment and for providing reliable data for soot model validation.