Flow-Structure Interaction Effects on a Jet Emanating from a Flexible Nozzle
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the recent years. The goal of the current study is to identify the flow field and mixing
characteristics associated with an incompressible circular jet through a flexible nozzle. The
flow was self-excited over a range of conditions and produced a pulsatile flow. The frequency
of excitation was found to be between 150-175Hz. Phase-locked and time averaged 2D
Particle image Velocimetry (PIV) was used to study the dynamic characteristics of the flow.
The flow field shows that two different modes could be excited depending on nozzle
characteristic. The flapping mode was associated with alternate shedding of vortices. This
introduces strong steering of the jet to one side or the other. Turbulence, Jet spread and
entrainment characteristics were far more superior to the non-flapping or a pulsed jet. The
second mode which was a non-flapping mode is associated with the formation of a counter
rotating vortex pair. The turbulence associated with both these modes was convected along
with the vortical structure in the flow. The jet vortices formed by the self-excited flow were
not just convected by the flow, but these determined the flow field and mixing characteristics
of the jet.