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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Fluidic low-frequency oscillator consisting of load-switched diverter and a pair of vortex chambers
 Tesař, Václav ; Peszyński, K. ; Smyk, E.
Paper discusses a new configuration of fluidic oscillators, a subject of recent Patent application. There is some similarity with the standard Warren oscillator with its bistable jet-deflection diverter and two feedbacks – which is not suitable for situations demanding very low oscillation frequency. For these conditions the new design replaces jet-deflection switching in the diverter by load-switching effects, with the gradually increased loading by spin-up of fluid in the vortex chambers. The spin-up time also provides the needed time delays. Behaviour is characterised by the oscillation frequency increasing with increasing fluid flow rate – for which was derived a surprisingly simple theoretical solution.
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Fluidic oscillator with bistable turn-down amplifier
 Tesař, Václav ; Smyk, E. ; Peszyński, K.
Search for new principles of no-moving-part fluidic oscillators suitable for operation at low frequency – and yet compact – has led to a design based on the amplifier configuration combining bistability (capability to remain in two alternative stable regimes) with capability to turn down the fluid flow passing through it. The feedback was arranged in a manner of recently introduced oscillators with resonator channel. Tests revealed the expected non-constant Strouhal number - but, rather strange, no dependence was found of oscillation frequency on the channel length.
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Control of flow separation by vestigial "synthetic jet"
 Tesař, Václav ; Pavelka, Miroslav ; Smyk, E. ; Peszyński, K.
A useful aerodynamic control action may be causing a separation of flow from the wall past which the fluid flows. Several current research activities aim at doing so by oscillating zero-time-mean flow generated in a nozzle located in the wall. The effect is often described as “flow control by synthetic jet”, although it is obvious that the vortex rings generated in the outflow phase of the oscillation are deformed by the controlled flow and also are carried too far away so that they cannot form the classical synthetic jet configuration of vortex rings. Authors describe experiments with such a control applied successfully in an axisymmetric fluidic valve. Presented is a hypothesis explaining the separation mechanism.
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