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research-article

On Dynamics of Acoustically Driven Bistable Fluidic Valves

[+] Author and Article Information
Michael Mair

Oxford Thermofluids Institute, Department of Engineering Science, University of Oxford
Michael.Mair@eng.ox.ac.uk

Marko Bacic

Oxford Thermofluids Institute, Department of Engineering Science, University of Oxford
marko.bacic@eng.ox.ac.uk

Peter Ireland

Oxford Thermofluids Institute, Department of Engineering Science, University of Oxford
peter.ireland@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041890 History: Received February 23, 2018; Revised October 26, 2018

Abstract

The dynamics of an actively controlled fluidic diverter with novel actuation method are presented. This bistable fluidic valve is based on the Coanda effect and is able to switch the main flow solely by means of acoustic excitation. The switching is explained through a combination of experiments and Large Eddy Simulations. The switching time and minimum energy required are characterised for a range of pressure ratios, acoustic excitation frequencies and input powers. It is shown that the switching mechanism depends on the excitation of natural instabilities inside the free shear layer. An enhanced rollup of vortices at the excitation frequency increases the rate of entrainment and results in a transverse pressure gradient sufficient to counteract the Coanda effect leading to jet detachment and switching.

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