Abstract

A series of measurements was made simultaneously by using arrays of hot-wire anemometers with X-probes. The data show the rows consisted of doughnut-type large-scale vortices and their frequent pairing which results in larger vortices. The interaction of these vortices beyond the jet centerline breaks the doughnuttype large-scale vortices and forms three-dimensional medium and small-sized vortices. The flow is randomized through this process. Some large scale vortices continue to pair and form the configuration of counter-rotating vortices approximately alternating on opposite sides of the jet centerline in the region far from the nozzle.

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