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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Jet flow issuing from an axisymmetric pipe-cavity-orifice nozzle
 Broučková, Zuzana ; Pušková, P. ; Trávníček, Zdeněk ; Šafařík, P.
Axisymmetric air jet flow is experimentally investigated under passive flow control. Jet issues from a pipe (inner diameter 10mm, length 150 mm) equipped with an axisymmetric cavity at the end. Cavity operates as resonator creating self-sustained acoustic excitations. Mechanism of excitations is complex. Experimental methods were: flow visualization, microphone measurements and velocity measurements by the Pitot probe. Power spectral density (PSD) and sound pressure level (SPL) were evaluated from microphone measurements. Jet Reynolds number ranged Re = 1600–18 000. Peaks in PSD indicated a function of the resonator. The most effective acoustic response was found at higher Re. Results demonstrate effects of the control: mixing and velocity decay along the axis are intensified. It causes shortening of the transition region. However, an inverse proportionality of the velocity decay in the fully developed region is not changed. Momentum and kinetic energy fluxes decrease more intensively.
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Passive control of axisymmetric air flow
 Pušková, P. ; Šafařík, P. ; Trávníček, Zdeněk ; Broučková, Z.
The work deals with passive management axially symmetrical air flow through the resonator. The aim is to see how it affects the behavior of the resonator current. To verify the theoretical knowledge is known experimentally measured frequency response of the Helmholtz resonator. It is also detected spectral power density signal from the microphone for various flow regimes (Re = 1600, 5000, 10000 and 30000) and various volumes of the resonator. For selected modes stream characteristics (speed decreases in the axis of flow and velocity profiles) are measured by Pitot probes. Then the flow characteristics are compared without a resonator and with resonator.
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1 Pušková, Pavlína
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