Karimzadegan, K.; Mirzaei, M.; Bergada, J.M. Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications. Appl. Sci.2024, 14, 1690.
Karimzadegan, K.; Mirzaei, M.; Bergada, J.M. Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications. Appl. Sci. 2024, 14, 1690.
Karimzadegan, K.; Mirzaei, M.; Bergada, J.M. Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications. Appl. Sci.2024, 14, 1690.
Karimzadegan, K.; Mirzaei, M.; Bergada, J.M. Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications. Appl. Sci. 2024, 14, 1690.
Abstract
In Active Flow Control (AFC) applications, to activate the boundary layer the use of pulsating flow has notorious energy advantages versus constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection and momentum coefficient need to be tuned. Two main devices are nowadays capable of injecting pulsating flow with the sufficient momentum coefficient to delay the boundary layer separation, these are the Zero Net Mass Flow actuators (ZNMFA) and the Fluidic Oscillators (FO). In the present research, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, fluid is considered as incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effect of outlet width and mixing chamber wedge inclination angle dimensional modifications is addressed, modifications of the outlet width are observed to create large variations on the FO performance. The origin of the self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact we can conclude saying that the current FO configuration is pressure driven although the mass flow forces appear to be a much more relevant than in previous FO configurations studied.
Copyright:
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