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Fluidic oscillators for flow control

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Abstract

Fluidic oscillators are based on the bi-stable states of a jet (or a pair of jets) of fluid inside a specially designed flow chamber. These produce swee** or pulsing jets of high exit velocity (~sonic exit velocities) extending the control authority achievable to high subsonic flows. Swee** and pulsing jets with frequencies ranging from 1 to 20 kHz have been obtained with meso-scale (nozzle sizes in the range of 200 μm–1 mm) fluidic oscillators with very low mass flow rates of the order of 1 g/s. Such actuators have been recently used in laboratory scale experiments for separation control and cavity noise control with significant promise to be implemented in full-scale systems. In this paper, we provide a historical background of fluidic oscillators and methods to produce either swee** or pulsing jets, their typical frequency, flow rate, and scaling characteristics. Some challenges in detailed characterization of such actuators through measurement will be presented. We will also discuss some of the system integration issues of translating this technology into practice. This is followed by a brief discussion of the need for further development of such actuators and the understanding of the mechanism by which flow control is achieved by these swee** jets.

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Authors and Affiliations

  1. Advanced Fluidics LLC, 8860 Columbia 100 Parkway, Suite 204, Columbia, MD, 21045, USA

    Surya Raghu

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  1. Surya Raghu
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Correspondence to Surya Raghu.

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This article is part of the collection Topics in Flow Control. Guest Editors J.P. Bonnet and L. Cattafesta.

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Raghu, S. Fluidic oscillators for flow control. Exp Fluids 54, 1455 (2013). https://doi.org/10.1007/s00348-012-1455-5

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  • DOI: https://doi.org/10.1007/s00348-012-1455-5

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