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Effect Of Synthetic Jet Modulation Schemes On The Reduction Of A Laminar Separation Bubble

Title: Effect Of Synthetic Jet Modulation Schemes On The Reduction Of A Laminar Separation Bubble.
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Name(s): Seo, J. H., author
Cadieux, F., author
Mittal, R., author
Deem, E., author
Cattafesta, L., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-03-12
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The response of a laminar separation bubble to synthetic jet forcing with various modulation schemes is investigated via direct numerical simulations. A simple sinusoidal waveform is considered as a reference case, and various amplitude modulation schemes, including the square-wave "burst" modulation, are employed in the simulations. The results indicate that burst modulation is less effective at reducing the length of the flow separation than the sinusoidal forcing primarily because burst modulation is associated with a broad spectrum of input frequencies that are higher than the target frequency for the flow control. It is found that such high-frequency forcing delays vortex roll-up and promotes vortex pairing and merging, which have an adverse effect on reducing the separation bubble length. A commonly used amplitude modulation scheme is also found to have reduced effectiveness due to its spectral content. A new amplitude modulation scheme which is tailored to impart more energy at the target frequency is proposed and shown to be more effective than the other modulation schemes. Experimental measurements confirm that modulation schemes can be preserved through the actuator and used to enhance the energy content at the target modulation frequency. The present study therefore suggests that the effectiveness of synthetic jet-based flow control could be improved by carefully designing the spectral content of the modulation scheme.
Identifier: FSU_libsubv1_wos_000427117100001 (IID), 10.1103/PhysRevFluids.3.033901 (DOI)
Keywords: dynamics, numerical-simulation, pressure, frequency, layer, actuators, airfoil, active control, aerodynamic flow-control, stall
Publication Note: The publisher's version of record is available at https://doi.org/10.1103/PhysRevFluids.3.033901
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000427117100001
Owner Institution: FSU
Is Part Of: Physical Review Fluids.
2469-990X
Issue: iss. 3, vol. 3

Choose the citation style.
Seo, J. H., Cadieux, F., Mittal, R., Deem, E., & Cattafesta, L. (2018). Effect Of Synthetic Jet Modulation Schemes On The Reduction Of A Laminar Separation Bubble. Physical Review Fluids. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000427117100001