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Changes in a coflowing jet structure caused by acoustic forcing

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Abstract

In the present work, the changes in the basic turbulence field of an axisymmetric jet in a coflow when acoustic forcing is applied are investigated. The main objective is to discriminate between changes produced by the acoustic forcing and those produced by the presence of solid particles in a two-phase flow. Power spectra of the axial velocities, u(t), are analyzed to reinforce the idea of the existence of a natural frequency. Time-averaged data are used to characterize the basic flow. This basic flow is compared with the flow altered by the acoustic forcing. By smoothing the phase-averaged rms data (mean statistical curve), the general behavior of the instantaneous fluctuations are unveiled and compared with that of the natural (unforced) jet. In this way, it can be seen that rms values in the forced cases are higher than in the unforced ones, due to the contribution of the external forcing. However, once the coherent structures are extinguished, both forced and unforced jets show a similar trend.

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Acknowledgements

The authors wish to thank Professor César Dopazo for his invaluable comments on the physics associated with the phenomena, and Dr. Javier Ballester and Dr. Antonio Lozano for their help on the final form of the paper. The help of Dr. Ignacio García in the assembly of some of the instrumentation and the collection of data is greatly appreciated.

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Authors and Affiliations

  1. Fluid Mechanics Department, University of Zaragoza, C/ Pedro Cerbuna, 12, 50009, Zaragoza, Spain

    Luis M. Cerecedo, Luis Aísa, Juan A. García & José L. Santolaya

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  1. Luis M. Cerecedo
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  2. Luis Aísa
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  3. Juan A. García
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  4. José L. Santolaya
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Correspondence to Luis M. Cerecedo.

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M. Cerecedo, L., Aísa, L., A. García, J. et al. Changes in a coflowing jet structure caused by acoustic forcing. Exp Fluids 36, 867–878 (2004). https://doi.org/10.1007/s00348-003-0769-8

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  • DOI: https://doi.org/10.1007/s00348-003-0769-8

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