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Main Title: Piezo-Polymer-Composite Unimorph Actuators for Active Cancellation of Flow Instabilities Across Airfoils
Author(s): Haller, Daniel
Pätzold, A.
Losse, N.
Neiss, S.
Peltzer, Inken
Nitsche, W.
King, Rudibert
Woias, P.
Type: Article
Language Code: en
Abstract: This article presents a smart device for active cancellation of flow instabilities. An array of two piezo unimorph actuators fabricated in piezo-polymer-composite technology is combined with a thin silicone membrane to mimic a movable wall with a closed surface. By locally displacing the thin membrane, a surface wave is generated that interferes with naturally occurring flow instabilities within the boundary layer of an airfoil. Using flow sensors and an intelligent control enables a destructive interference and therefore, an attenuation of natural flow instabilities. This leads to a delay of transition. The boundary layer remains laminar which means drag is reduced. Within the next pages, the setup of the device with actuators, membrane, sensors, and control is introduced. The main focus of this article is on actuator design, modeling, and implementation for wind tunnel experiments. Results of actuator characterization are presented. The non-linear behavior of the piezoactuator (harmonic distortions and impact of high electric fields) is investigated in detail. This study concludes with the results obtained in wind tunnel experiments which prove the functionality of the presented approach. A maximal attenuation of natural occurring flow instabilities of 80% is achieved.
Issue Date: 2011
Date Available: 8-Jan-2019
DDC Class: 600 Technik, Technologie
670 Industrielle Fertigung
Subject(s): actuator
harmonic distortions
active transition control
TS waves
non-linear piezoeffects
Sponsor/Funder: DFG, SPP 1207, Strömungsbeeinflussung in der Natur und Technik
Journal Title: Journal of Intelligent Material Systems and Structures
Publisher: SAGE Publications
Publisher Place: Washington, DC
Volume: 22
Issue: 5
Publisher DOI: 10.1177/1045389X10395794
Page Start: 461
Page End: 474
EISSN: 1530-8138
ISSN: 1045-389X
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:FG Mess- und Regelungstechnik » Publications

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