Topological structure of a jet in a cross flow

Experimental studies of round jets in cross flow have been made using flying hot-wire and flow visualization techniques. The velocity ratio of the flow ranged from about two to six with the Reynolds number up to 6200. The flying hot wire enables time- and phase-averaged measurements to be made in regions of the flow which cannot be measured accurately using stationary wires. These quantitative results together with the complementary flow visualization studies have allowed the mean topological features of the jet in cross flow to be identified using critical point theory. An understanding of these flow features may provide insight into the large-scale mixing processes which occur in the shear layer of the jet.