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Syntetizovaný proud - návrh generátoru a ověření jeho funkce
Trávníček, Zdeněk ; Vít, T. ; de Boer, P. ; Maršík, František
A zero-net-mass-flux actuator was designed, and a synthesis of an air jet was investigated. The operating parameters were suggested near the resonance frequency. The proper actuation was experimentally tested by smoke visualization and hot-wire anemometry. Two typical synthetic jets are presented, namely the so-called "long" and "short" extruded fluid column cases. The maxima of the centerline local and the time-mean velocities reached approximately 27 m/s and 8.7 m/s, respectively.
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Visualizace a numerické modelování stísněného koaxiálního proudu
Trávníček, Zdeněk ; Hrubý, Jan ; Vogel, J.
This study deals with the limiting geometry of confined coaxial jets when the outer diameter of the annular jet is identical with that of the confining round duct. The visualization was made in air, the numerical simulation used software FLUENT. The study focused on laminar flows, and on the stability loss of the inner round jet. To portrayal three-dimensional and helical structures, a stereoscopic technique was employed. The passing frequency was evaluated stroboscopically.
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