K. Toyoda et al., EDUCATION OF VORTICAL STRUCTURES BY PRESSURE MEASUREMENTS IN NONCIRCULAR JETS, Applied scientific research, 53(3-4), 1994, pp. 237-248
Vortical structures in the noncircular jets excited at the interaction
mode were educed by measuring fluctuating static pressure, and their
characteristics were discussed in relation to the mixing mechanism of
the noncircular jets. The contours of phase-average fluctuating pressu
re show clearly the vortical structures of the noncircular jets, which
compare reasonably with those observed by the flow visualization expe
riments. The evolution of the vortical structures is characterized by
partial merging, stretching and splitting to smaller vortices. The eff
ects of the noncircular vortical structures on mixing were also discus
sed based on the quantitative measurements of the velocity fields, the
results suggesting that the interactions of vortical structures in th
e noncircular jets are very effective to enhance mixing.