Abstract
The self-excited tone of a circular jet impinging upon a coaxial pipe can be give rise to not simply a single, however as many as well-defined frequency components in the rage of Reynoldsnumber (based on initial momentum thickness and jet velocity) 171⪈Re⪈271. All of these components are traceble to the nonlinear interraction frequency of two primary components : the most stable frequency of the jet shear layer, β, and a low-frequency modulating component, β/2. The modulating component β/2 arises from vortex-vortex interaction at the impingiment edge. Its upsteram storongly modulates the sensitive regime of the shear layer at the nozzle lip. The most stable component can become sudden change (i.e. frequency down) when it is coincided with resonance of the air column in pipe.
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