Planar measurements of the distribution of particles in a two-phase precessing jet flow

Abstract

Precessing jets are a class of oscillating flow with application in the combustion of pulverised fuels, especially in rotary kilns. A planar laser technique was used to obtain the distributions of 25-45 mm hollow glass particles in the near field of these jets. The influence of the momentum ratio of precessing jet to co-annular jet flow on the distribution of particles is assessed. Mean centreline particle concentrations, concentration half-widths, and radial profiles are presented. It is found that small amounts of jet precession result in an elongation and narrowing of the overall particle distribution. More substantial amounts of jet precession create shorter and wider distribution of particles.