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Shear Layer and Shedding Modes Excitations of a Backward-Facing Step Flow by Surface Plasma Discharge
- Benard, N. (author)
-
- Sujar Garrido, Patricia (author)
- KTH,Strömningsmekanik och Teknisk Akustik,Linné Flow Center, FLOW
- Bonnet, J. -P (author)
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- Moreau, E. (author)
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- (creator_code:org_t)
- 2019-10-18
- 2020
- English.
- In: Advances in Effective Flow Separation Control for Aircraft Drag Reduction. - Cham : Springer. ; , s. 55-74
- Book chapter (peer-reviewed)
Abstract
Subject headings
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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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Keyword
- Flow control
- PIV
- Plasma actuator
- Triple decomposition
- Turbulent shear layer
Publication and Content Type
- ref (subject category)
- kap (subject category)
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