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On the wave-cancelling nature of boundary layer transition control
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-6343-7507
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0002-5913-5431
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2018 (English)In: 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, International Council of the Aeronautical Sciences , 2018Conference paper, Published paper (Refereed)
Abstract [en]

This work deals with the feedforward active control of velocity fluctuations over incompressible 3D boundary layers. Two strategies are evaluated, the Linear Quadratic Gaussian (LQG) controller, built using the eigensystem realization algorithm (ERA), is compared to a wave-cancellation scheme, obtained via the direct inversion of the frequency-domain transfer functions of the system. For the evaluated cases, it is shown that LQG leads to a wave-cancelling signal of the incoming Tollmien-Schlichting wavepacket. Such result allows further insight into the physics behind the active control of convectively unstable flows permitting, for instance, the optimization of the transverse position for actuation via a linear stability approach.

Place, publisher, year, edition, pages
International Council of the Aeronautical Sciences , 2018.
Keywords [en]
Feedforward control, Flow control, Tollmien-Schlichting waves, Boundary layers, Frequency domain analysis, Boundary layer transition control, Eigensystem realization algorithms, Feedforward active control, Frequency domain transfer functions, Linear Quadratic Gaussian controllers, Linear Stability, Velocity fluctuations
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247421Scopus ID: 2-s2.0-85060493114ISBN: 9783932182884 (print)OAI: oai:DiVA.org:kth-247421DiVA, id: diva2:1313129
Conference
31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, 9 September 2018 through 14 September 2018
Note

QC20190502

Available from: 2019-05-02 Created: 2019-05-02 Last updated: 2019-09-24Bibliographically approved

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Scopushttps://www.aidaa.it/31st-congress-of-the-international-council-of-the-aeronautical-sciences.htm

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Morra, PierluigiHanifi, ArdeshirHenningson, Dan S.

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