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Shear Layer and She...
Shear Layer and Shedding Modes Excitations of a Backward-Facing Step Flow by Surface Plasma Discharge
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2019-10-18
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Cham :Springer,2020
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-267864
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-267864URI
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https://doi.org/10.1007/978-3-030-29688-9_3DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:kap swepub-publicationtype
Notes
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QC 20200219
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The present experimental study interests in determining the influence of a linear plasma actuator (dielectric barrier discharge) on the development of a separated turbulent shear layer. More specifically, the plasma actuator is used to impose periodic perturbations at the step corner of a backward-facing step. Two different modes of excitation are explored. One concerns the shear layer mode of instability, a mode whose amplification leads to a minimization of the recirculation bubble. The present investigation shows how a dielectric barrier discharge plasma actuator can impose periodic perturbations that excite the shear layer mode and result in a strong regularization of the vortex street. The case of excitation at the shedding mode is also experimentally investigated using a DBD actuator. The measurements show the increase in Reynolds stress caused by this excitation as well as the specific growing mechanism of the shear layer. Indeed, phase-averaged flow measurements highlights the difference in the mechanism of development of the shear layer regarding the type of excitation used, the shear layer mode promoting a growing mechanism by fluid entrainment while the shedding mode enhancing the pairing of successive vortical flow structures.
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Added entries (persons, corporate bodies, meetings, titles ...)
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Sujar Garrido, PatriciaKTH,Strömningsmekanik och Teknisk Akustik,Linné Flow Center, FLOW(Swepub:kth)u1ipfepj
(author)
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Bonnet, J. -P
(author)
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Moreau, E.
(author)
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KTHStrömningsmekanik och Teknisk Akustik
(creator_code:org_t)
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