Abstract
Two-dimensional iodine concentration in cold jets were visualized by the planar laser-induced fluorescence method. The laser sheet was formed by multi-reflected laser light, and a correction method of the heterogeneous laser sheet was developed. Average concentration in a cold nitrogen jet was measured at a velocity of 18.9 m/s. The two-dimensional distrubution profile of the average concentration showed familiar jet profile. The transition to the fully developed region was recognized by the longitudinal decrease of the peak concentration. The concentration profiles at different locations showed self-similarities. Unsteady confined helium jet was also visualized at a rate of 100 frames/s and showed the behavior of the injected jet and its mixing process.
