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 (LES). The switching time and minimum energy required are characterized 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 roll-up 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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June 2019
Research-Article
On Dynamics of Acoustically Driven Bistable Fluidic Valves
Michael Mair,
Michael Mair
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
e-mail: Michael.Mair@eng.ox.ac.uk
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
e-mail: Michael.Mair@eng.ox.ac.uk
Search for other works by this author on:
Marko Bacic,
Marko Bacic
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Search for other works by this author on:
Peter Ireland
Peter Ireland
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Search for other works by this author on:
Michael Mair
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
e-mail: Michael.Mair@eng.ox.ac.uk
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
e-mail: Michael.Mair@eng.ox.ac.uk
Marko Bacic
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Peter Ireland
Department of Engineering Science,
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
Oxford Thermofluids Institute,
University of Oxford,
Oxford OX2 0ES, UK
1Corresponding author.
2The second author is seconded part-time from Rolls Royce to the Oxford Thermofluids Institute.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 23, 2018; final manuscript received October 26, 2018; published online December 24, 2018. Assoc. Editor: Stefan aus der Wiesche.
J. Fluids Eng. Jun 2019, 141(6): 061202 (10 pages)
Published Online: December 24, 2018
Article history
Received:
February 23, 2018
Revised:
October 26, 2018
Citation
Mair, M., Bacic, M., and Ireland, P. (December 24, 2018). "On Dynamics of Acoustically Driven Bistable Fluidic Valves." ASME. J. Fluids Eng. June 2019; 141(6): 061202. https://doi.org/10.1115/1.4041890
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