Stochastic regimes in very-low-frequency fluidic oscillator
Institute of Thermomechanics v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 5, 182 00 Praha-Kobylisy, Czech Republic
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Published online: 28 March 2016
Paper discusses interesting unexpected stochastic regimes discovered in a fluidic oscillator designed for operation at very low oscillation frequencies - without the inconvenience of the long feedback loops needed in standard low-frequency oscillator designs. The new oscillator contains a pair of bistable turn-down active valves operating in anti-parallel — essentially analogous to Abraham & Bloch electric “multibrateur” invented in 1919. Three different self-excited oscillation regimes were found. In the order of increasing supplied flow rate, these regimes are characterised by: (A) generation of stochastic-duration multi-pulse packs, (B) generation of individual pulses with a degree of periodicity, and (C) regime with randomly appearing flow pulses separated by intervals of the order of seconds.
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