Abstract
The application of synthetic jet actuators to control aerodynamic flows has been widely investigated in the last years. In many situations, arrays of synthetic jet actuators or multiple-orifice (or multi-slot) devices are preferred to single-orifice/single-slot actuators, especially in separation control and cooling applications. However, the behaviour of the flow field generated by such actuators is still the object of ongoing research, both in quiescent conditions and in presence of a crossflow.
A numerical study on synthetic jets issuing from a double-orifice, single-cavity device is presented in the present work. A series of direct numerical simulations is carried out using the open-source code OpenFOAM. The study focuses on the behaviour of the jets in the near-field: time-averaged velocity profiles and phase-averaged velocity fields are investigated. After validating the computational setup against previous experimental data, the spacing between the orifices is gradually decreased. Scaling laws for the merging point and the combined point are derived and compared qualitatively with previous literature results about round, continuous twinjets. It is shown that the time-averaged merging point streamwise position is linearly dependent on the jet spacing. The analysis of the phase-averaged velocity shows that for low spacings the trajectory of the vortex arising from the orifice lips is inclined, whereas for high spacings the near-field behaviour is similar to a isolated jet.
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Acknowledgements
The authors wish to thank Mirko Paolella, Riccardo Vairo and Luigi Trezza for the work carried out during their theses. Part of this work was supported by a grant of HPC time from CINECA under the ISCRA-C project NISIDA.
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Palumbo, A., Della Pia, A., Chiatto, M., de Luca, L. (2020). Numerical Study on the Flow Field Generated by a Double-Orifice Synthetic Jet Device. In: Carcaterra, A., Paolone, A., Graziani, G. (eds) Proceedings of XXIV AIMETA Conference 2019. AIMETA 2019. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-41057-5_4
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DOI: https://doi.org/10.1007/978-3-030-41057-5_4
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