Manifestation of the stochastic resonance in submerged jets under an acoustic action |
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Authors: | P. S. Landa V. G. Ushakov |
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Affiliation: | (1) Moscow State University, Moscow, 117234, Russia;(2) Central Institute of Aerohydrodynamics, Moscow Complex TsAGI Branch, Moscow, 107005, Russia |
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Abstract: | A phenomenon that is similar to the well-known stochastic resonance in nonlinear oscillators but is caused by the turbulence in a circular submerged jet under a harmonic acoustic action, rather than by noise, is considered. It is shown that, at a fixed distance from the nozzle, a variation of the initial turbulence level leads to a non-monotonic variation of the wave amplitude at the frequency of the acoustic action, namely, to the appearance of an amplitude maximum at a certain level of the initial turbulence. The qualitative explanation of the phenomenon consists in that the initial turbulence acts on the system in a way similar to that of external noise: it changes the effective parameters of the system and, in particular, shifts the spectral maxima, which is equivalent to a change in a certain “eigenfrequency.” Such a change in the effective parameters of the jet leads to a phenomenon similar to the stochastic resonance. |
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