Turbulent, swirling flow over an axisymmetric, constant radius surface

LDV measurements are presented of isothermal flow in a full-scale cold-model industrial burner. The burner's quarl is similar to the exit shape of a horned instrument: a curved, diverging surface over which air flows. Measurements were obtained in a turbulent swirling flow in the near flow field both with and without the quarl in place, all at a Reynolds number of about 71,000 and mean swirl number of 0.89. Radial profiles of the axial, radial, and tangential components of mean and fluctuation velocities and cross-correlations are obtained at several axial locations. Structural parameters are considered. The data suggest that when the quarl is in place the flow consist of inner and outer regions. They are characterised by a constant negative axial velocity in the central core and a wall jet that develops along the wall.