Abstract
It is possible to control the spread of a plane jet passively by the vortices from a two-dimensional cylinder installed in the nozzle contraction. In a particular condition of cylinder placement, two distinctive spectral peaks at frequencies f1 and f2 with their averaged frequency at 1/2 the vortex shedding frequency fv were observed, where the jet exhibits flapping motion at low frequency f3 (= f1-f2).The vortex structures in a plane jet under inharmonic excitation were studied by means of hot-wire and phase ensemble-averaging techniques. The phase ensemble-averaging results show that the vortex street shed at frequency. fυ/2 was formed in the jet under inharmonic excitation, and similar vorticity distributions appeared in the upper and lower shear-layers alternately at frequency f3. As the result, within the duration of one flapping motion, successive nine vortices were formed at shedding frequency fv/2 to complete their one cycle of evolution.
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