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Effective Synthetic Jet Control for Separation Control on BFS

Ming, Xiao and Ma, Xingyu and Geisler, Reinhard and Li, Peng (2020) Effective Synthetic Jet Control for Separation Control on BFS. In: Computational Methods in Applied Sciences Computational Methods in Applied Sciences, 52 (1). Springer International Publishing. 241 - 253. doi: 10.1007/978-3-030-29688-9_14. ISBN 978-3-030-29687-2. ISSN 1871-3033.

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Official URL: https://www.springer.com/gp/book/9783030296872


The flow separation behind a two-dimensional backward facing step is controlled by synthetic jet which is different from traditional ones. The synthetic jet is generated from a 2 mm horizontal slot which is at up corner of the step and facing downstream direction. In order to investigate the effectiveness of the synthetic jet at different actuation frequencies (0, 35, 50 and 100 Hz), 2C-2C particle image velocimetry and fluorescence oil-film was used to indicate the flow pattern on the surface and measure quantitatively the skin friction downstream of the step. The velocity vector field as well as global skin friction clearly indicates reduction of the reattachment length under proper actuation. The comparisons among frequencies indicate that the reattachment length depends on the actuation frequencies. The most effective reduction of reattachment length as much as 43.7% is achieved at the frequency of 100 Hz, corresponding to a Strouhal number Sth ≈ 0.3, based on the free-stream velocity and step height. The Reynolds shear stress is considerably increased and large-scale vortices are analyzed. The skin friction downstream is increased by 20% at the frequency of 35 Hz (Sth ≈ 0.026). In the conclusion, the streaming mechanism of a synthetic jet is briefly discussed.

Item URL in elib:https://elib.dlr.de/134519/
Document Type:Contribution to a Collection
Additional Information:eBook ISBN: 978-3-030-29688-9 Hardcover ISBN: 978-3-030-29687-2 Series ISSN: 1871-3033 DOI Buch: 10.1007/978-3-030-29688-9 Paper DOI: 10.1007/978-3-030-29688-9_14
Title:Effective Synthetic Jet Control for Separation Control on BFS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ming, Xiaomingam (at) nuaa.edu.cn; mingam (at) 126.comUNSPECIFIED
Ma, Xingyumaxingyu1986 (at) hotmail.comUNSPECIFIED
Geisler, ReinhardReinhard.Geisler (at) dlr.deUNSPECIFIED
Journal or Publication Title:Computational Methods in Applied Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/978-3-030-29688-9_14
Page Range:241 - 253
EditorsEmailEditor's ORCID iD
Qin, NingDepartment of Mechanical Engineering, University of Sheffield, Sheffield, UKUNSPECIFIED
Periaux, JacquesUniversitat Politècnica de Catalunya, International Center for Numerical Methods in Engineering, Barcelona, SpainUNSPECIFIED
Bugeda, GabrielUniversitat Politècnica de Catalunya, International Center for Numerical Methods in Engineering, Barcelona, SpainUNSPECIFIED
Publisher:Springer International Publishing
Series Name:Computational Methods in Applied Sciences
Keywords:Flow control, Synthetic jet, Backward facing step, Particle image velocimetry, Fluorescence oil-film
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:05 Jun 2020 11:08
Last Modified:20 Jun 2021 15:53

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