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Separation control with fluidic oscillators in water

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An Erratum to this article was published on 06 September 2017

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Abstract

The present study assesses the applicability of fluidic oscillators for separation control in water. The first part of this work evaluates the properties of the fluidic oscillators including frequency, cavitation effects, and exerted thrust. Derived from the governing internal dynamics, the oscillation frequency is found to scale directly with the jet’s exit velocity and the size of the fluidic oscillator independent of the working fluid. Frequency data from various experiments collapse onto a single curve. The occurrence of cavitation is examined by visual inspection and hydrophone measurements. The oscillation frequency is not affected by cavitation because it does not occur inside the oscillators. The spectral information obtained with the hydrophone provide a reliable indicator for the onset of cavitation at the exit. The performance of the fluidic oscillators for separation control on a bluff body does not seem to be affected by the presence of cavitation. The thrust exerted by an array of fluidic oscillators with water as the working fluid is measured to be even larger than theoretically estimated values. The second part of the presented work compares the performance of fluidic oscillators for separation control in water with previous results in air. The array of fluidic oscillators is installed into the rear end of a bluff body model. The drag improvements based on force balance measurements agree well with previous wind tunnel experiments on the same model. The flow field is examined by pressure measurements and with particle image velocimetry. Similar performance and flow field characteristics are observed in both water and air.

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  • 06 September 2017

    An erratum to this article has been published.

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Acknowledgements

This work is part of the research project “Investigation of the Unsteady Wake behind a Generic Tractor-Trailer with Different Boundary Conditions” (PA 920/26-1). The authors would like to thank the German Science Foundation (DFG) for the financial support.

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Authors and Affiliations

  1. Institute of Fluid Dynamics and Technical Acoustics, Hermann-Föttinger-Institut, Technische Universität Berlin, Berlin, 10623, Germany

    H. -J. Schmidt, R. Woszidlo, C. N. Nayeri & C. O. Paschereit

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  1. H. -J. Schmidt
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  2. R. Woszidlo
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  3. C. N. Nayeri
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  4. C. O. Paschereit
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Correspondence to H. -J. Schmidt.

Additional information

An erratum to this article is available at https://doi.org/10.1007/s00348-017-2414-y.

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Schmidt, H.J., Woszidlo, R., Nayeri, C.N. et al. Separation control with fluidic oscillators in water. Exp Fluids 58, 106 (2017). https://doi.org/10.1007/s00348-017-2392-0

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