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This research deals with the switching mechanism of a flip-flop jet nozzle with a connecting tube, being based on the measurements of pressure in two chambers, velocity in the connecting tube and velocity distribution between two inside walls of the nozzle, i.e., reattachment walls. The authors particularly focus upon the details of switching flow field inside the nozzle, using a ultrasound-velocity-profile monitor (UVP monitor). As a result, two re-circulating flows, viz., two vorticaldoi:10.1299/jfst.2.359 fatcat:rmew44ruefh4zlefpm4fzpqvme