An experimental investigation has been conducted of the isothermal mix
ing of a turbulent jet injected perpendicular to a uniform crossflow t
hrough several different types of sharp-edged orifices. Jet penetratio
n and mixing was studied using planar Mie scattering to measure time-a
veraged mixture fraction distributions of circular, square, elliptical
, and rectangular orifices of equal geometric area injected into a con
stant velocity crossflow. Hot-wire anemometry was also used to measure
streamwise turbulence intensity distributions at several downstream p
lanes. Mixing effectiveness was determined using 1) a spatial unmixedn
ess parameter based on the variance of the mean jet concentration dist
ributions and 2) by direct comparison of the planar distributions of c
oncentration and of turbulence intensity. No significant difference in
mixing performance was observed for the six configurations based on c
omparison of the mean properties.