Self-excited jet: upstream modulation and multiple frequencies

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Abstract
The self-excited oscillation of a planar jet impinging upon a wedge can give rise to not simply a single, but as many as seven well-defined frequency components in the range of Reynolds-number (based on nozzle width and mean velocity) 250 ≤ Re ≤ 1150. All of these components are traceable to the nonlinear distortion/interaction (i.e. sum and difference) frequencies of two primary components: the most stable frequency of the jet shear layer (β); and a low-frequency modulating component (β, which eventually gives way to the most unstable component β further downstream.

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