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Erschienen in:
2008 | OriginalPaper | Buchkapitel
High Resolution PIV Study of Zero-Net-Mass-Flow Lift Enhancement of NACA 0015 Airfoil at High Angles of Attack
verfasst von : Trevor Stephens, Julio Soria
Erschienen in: IUTAM Symposium on Flow Control and MEMS
Verlag: Springer Netherlands
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The effect of changing the pitch to diameter ratio (
P/D
) of a row of round, wall-normal, zero-net-mass-flux (ZNMF) jets located at the leading edge of a NACA 0015 airfoil was investigated. A parametric study and particle image velocimetry (PIV) measurements were conducted on a two-dimensional airfoil in a water tunnel at a Reynolds number of 6.56 ×10
4
. Different optimal forcing frequencies and percentage lift increases between the two
P/D
cases were observed. It is possible that differences in jet interaction mechanisms may have caused the differences in control effectiveness between
P/D
cases. Time-averaged streamlines indicate a reduction in the size of a recirculation region over the upper surface of the airfoil may be causing the improved lift.