Active control of flow separation from the slat shoulder of a supercritical airfoil

Latunia G. Pack, Norman W. Schaeffler, Chung Sheng Yao, Avi Seifert

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

23 Scopus citations


Active flow control in the form of periodic zeromass- flux excitation was applied at the slat shoulder of a simplified high-lift airfoil to delay flow separation. The NASA Energy Efficient Transport (EET) supercritical airfoil was equipped with a 15% chord simply hinged leading edge slat and a 25% chord simply hinged trailing edge flap. The cruise configuration data was successfully reproduced, repeating previous experiments. The effects of flap and slat deflection angles on the performance of the airfoil integral parameters were quantified. Detailed flow features were measured as well, in an attempt to identify optimal actuator placement. The measurements included, steady and unsteady model and tunnel wall pressures, wake surveys, arrays of surface hot-films, flow visualization and Particle Image Velocimetry (PIV). High frequency periodic excitation was applied to delay the occurrence of slat stall and improve the maximum lift by 10 to 15%. Low frequency amplitude modulation was used to reduce the oscillatory momentum coefficient by roughly 50% with similar aerodynamic performance.

Original languageEnglish
Title of host publication1st Flow Control Conference
StatePublished - 2002
Event1st Flow Control Conference 2002 - St. Louis, MO, United States
Duration: 24 Jun 200226 Jun 2002

Publication series

Name1st Flow Control Conference


Conference1st Flow Control Conference 2002
Country/TerritoryUnited States
CitySt. Louis, MO


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