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Separation Control Mechanism of Airfoil using Synthetic Jet

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Authors
Kim, Sang Hoon; Hong, Wooram; Kim, Chongam
Issue Date
2007-09
Publisher
대한기계학회 = The Korean Society of Mechanical Engineers
Citation
Journal of Mechanical Science and Technology, vol. 21, pp. 1367-1375
Keywords
flow controlseparation controlsynthetic jet
Abstract
Numerical simulation of separation control using a synthetic jet was performed on NACA23012 airfoil. The computed results showed that stall characteristics and control surface performance could be improved substantially by resizing the separation vortices. It was observed that actual flow control mechanism was fundamentally different depending on the range of synthetic jet frequency. For low frequency range, small vortices due to synthetic jet penetrated to the large leading edge separation vortex flow, and as a result, the size of the leading edge separation vortex remarkably decreased. For high frequency range, however, the small vortex did not grow enough to penetrate into the large separation vortex, but the synthetic jet changed airfoil circulation directly. The synthetic jet conditions for effective lift increase are as follows: the non-dimensional frequency of the synthetic jet is 1; the location of the synthetic jet slot is the same as the separation point; and the jet velocity is large enough to perturb the separated flow. By exploiting these conditions, it was observed that the combination of the synthetic jet with a simple high lift device could be as good as a conventional fowler flap system.
ISSN
1738-494X
Language
English
URI
http://uci.or.kr/G300-jX876237.v21n9p1367

http://hdl.handle.net/10371/6937
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Journal Papers (저널논문_기계항공공학부)
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