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Analysis of the synthetic jet at the actuator output
Kordík, J. ; Šafařík, P. ; Vít, T. ; Trávníček, Zdeněk
The paper focuses on a pulsatile axisymmetric flow in an outlet orifice of a zero-net-mass-flux actuator of a synthetic air jet. A simplified task (pulsatile pipe flow) is studied theoretically. Velocity profiles have been measured using hot-wire anemometry; the approximation of the experimental data is based on the theoretical solution. The results improve our knowledge of synthetic jets and provide data for their advanced numerical simulation.The paper focuses on a pulsatile axisymmetric flow in an outlet orifice of a zero-net-mass-flux actuator of a synthetic air jet. A simplified task (pulsatile pipe flow) is studied theoretically. Velocity profiles have been measured using hot-wire anemometry; the approximation of the experimental data is based on the theoretical solution. The results improve our knowledge of synthetic jets and provide data for their advanced numerical simulation.
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Impinging Synthetic Jet - Experiment
Kordík, J. ; Trávníček, Zdeněk ; Šafařík, Pavel
The paper deals with processing of an experimental data relating to an impinging synthetic jet. Impinging synthetic jet means a pulsating jet, spreading onto a wall (in this case naphthalene wall). The aim of the experiment is a quantification of mass transfer on the wall and a prediction of heat transfer by means of the heat/mass transfer analogy.
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On Physics of a Synthetic Jet
Uruba, Václav
Velocity field of a synthetic jet has been investigated experimentally. The synthetic jet is generated by electro-dynamical system designed for control of free shear layer. To catch unsteady periodical structures the phase average method is applied to time series of instantaneous velocities.
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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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