Extremum seeking control (ESC) and its slope seeking generalization are applied in a high-fidelity flow simulation framework for reduction of acoustic noise generated by a NACA0012 airfoil. Two Reynolds numbers are studied for which different noise generation mechanisms are excited. For a low Reynolds number flow, the scattering of vortex shedding at the airfoil trailing edge produces tonal noise, while for a moderate Reynolds number case, boundary-layer instabilities scatter at the trailing edge, leading to noise emission at multiple tones superimposed on a broadband hump. Different control setups are investigated, and they are configured to either find an optimal steady actuator intensity or an optimal position for a blowing/suction device. Implementation details are discussed regarding the control modules and design of digital filters. Analyses of physical phenomena as well as of relevant behavior of the actuated plant are conducted to understand how the extremum seeking loop leverages the flow physics to control noise. Depending on the flow configuration studied and the control setup, results demonstrate that the ESC can provide considerable airfoil noise reductions.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Extremum Seeking Control Applied to Airfoil Trailing-Edge Noise Suppression


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 60 , 2 ; 823-843


    Erscheinungsdatum :

    2021-09-29


    Format / Umfang :

    21 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Divergent-Trailing-Edge Airfoil

    Henne, Preston A. / Gregg, Robert D. | NTRS | 1988


    Aircraft airfoil trailing edge

    LIANG SHUANG / NIE TUN / ZHANG BIN et al. | Europäisches Patentamt | 2020

    Freier Zugriff

    Suppression of Tonal Trailing-Edge Noise From an Airfoil Using a Plasma Actuator

    Inasawa, Ayumu / Ninomiya, Chiho / Asai, Masahito | AIAA | 2013