Application of excitation from multiple locations on a simplified high-lift system

Latunia Pack Melton, Chung Sheng Yao, Avi Seifert

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A series of active flow control experiments were recently conducted on a simplified high-lift system. The purpose of the experiments was to explore the prospects of eliminating all but simply hinged leading and trailing edge flaps, while controlling separation on the supercritical airfoil using multiple periodic excitation slots. Excitation was provided by three, independently controlled, self-contained, piezoelectric actuators. Low frequency excitation was generated through amplitude modulation of the high frequency carrier wave, the actuators' resonant frequencies. It was demonstrated, for the first time, that pulsed modulated signal from two neighboring slots interact favorably to increase lift. Phase sensitivity at the low frequency was measured, even though the excitation was synthesized from the high-frequency carrier wave. The measurements were performed at low Reynolds numbers and included mean and unsteady surface pressures, surface hot-films, wake pressures and particle image velocimetry. A modest (6%) increase in maximum lift (compared to the optimal baseline) was obtained due to the activation of two of the three actuators.

Original languageEnglish
Title of host publication2nd AIAA Flow Control Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624100307
StatePublished - 2004
Event2nd AIAA Flow Control Conference 2004 - Portland, OR, United States
Duration: 28 Jun 20041 Jul 2004

Publication series

Name2nd AIAA Flow Control Conference


Conference2nd AIAA Flow Control Conference 2004
Country/TerritoryUnited States
CityPortland, OR


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